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John Wunderlin
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C/2012 S1 ISON
      #5625463 - 01/15/13 11:43 PM Attachment (140 downloads)

I'm hoping to take regular shots of ISON throughout the year. Here's my first entry. This video is just over 1 hour of data using 5 minute subs.

https://www.youtube.com/watch?v=hJesmSemxNY

Here is a stack on the comet:


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Rich (RLTYS)Moderator
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5625685 - 01/16/13 06:20 AM

That is a really cool video. Thanks for the views and keep up the good work.

Rich (RLTYS)


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norton67
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Re: C/2012 S1 ISON new [Re: Rich (RLTYS)]
      #5625746 - 01/16/13 08:14 AM

I had to watch it a few times. But its a great video, thanks for sharing.

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John Wunderlin
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Re: C/2012 S1 ISON new [Re: norton67]
      #5625886 - 01/16/13 09:59 AM

Thanks guys! Yes, I should have mentioned that it's very faint. It's best to watch it full screen in HD resolution.

Also, the equipment used: ST8300M camera, 10" LX50 SCT @ f/6.3 on G11 mount.


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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5626120 - 01/16/13 12:40 PM

Thanks for posting your image, John.

John Chumack's January the 8th image of the comet was featured at Spaceweather.com a couple of days ago.

http://www.spaceweather.com/images2013/09jan13/ison.jpg?PHPSESSID=c6h44mt4ukg...

Dave Mitsky


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: Dave Mitsky]
      #5626125 - 01/16/13 12:43 PM

Very cool- do you know how he calculates magnitude so closely?

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Mike Phillips
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5626367 - 01/16/13 03:11 PM

Great first look! Minorplanet center gives an M1 rating, not sure if that's what was used or he does astrometry? I'd like to know too.

Mike


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Tonk
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Re: C/2012 S1 ISON new [Re: Mike Phillips]
      #5627472 - 01/17/13 05:57 AM

Quote:

Minorplanet center gives an M1 rating




Thats just an estimate calculated from a stock comet brightness formula (the parameters m0 and n are just standard picks). Its not based on continuous measured values. MPC M1 *always* differ from the real value in my experience - often by up to 2 mags


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: Tonk]
      #5628103 - 01/17/13 01:35 PM Attachment (90 downloads)

I wasn't planning on imaging the comet again for a few weeks, but I noticed it was moving through a nice galaxy field last night and the clouds cleared off just long enough for me to grab 5 subs. Since the comet is so small I didn't bother adjusting the comet position so it's a bit streaked.

It's almost on top of IC2196. Incidentally I noticed that all the galaxy's positions are off quite a bit in stellarium. Luckily the comet's position was dead on.


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5628745 - 01/17/13 07:49 PM

I just discovered that CCDOps software from SBIG has the ability to calculate magnitude based on data measurement. It seems to be pretty accurate if Stellarium's numbers are in the ballpark. It looks like it's accurate to with a few tenths of a magnitude which seems pretty good to me. According to that software, it measures 15.38 which is quite a bit brighter than John Chumacks measurement. I doubt if it brightened that much in just a few days. Probably one of our measurements are off.

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timewarp
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5629242 - 01/18/13 01:20 AM

Is this comet still visible from the midwest John? Sorry for my ignorance but what equipment (minimum) is required to pick up the type of views you were able to obtain?

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Rich (RLTYS)Moderator
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5629382 - 01/18/13 06:00 AM

Quote:

I wasn't planning on imaging the comet again for a few weeks, but I noticed it was moving through a nice galaxy field last night and the clouds cleared off just long enough for me to grab 5 subs. Since the comet is so small I didn't bother adjusting the comet position so it's a bit streaked.

It's almost on top of IC2196. Incidentally I noticed that all the galaxy's positions are off quite a bit in stellarium. Luckily the comet's position was dead on.




A beautiful image. Thanks for the view.

Rich (RLTYS)


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: timewarp]
      #5629854 - 01/18/13 12:17 PM

Quote:

Is this comet still visible from the midwest John? Sorry for my ignorance but what equipment (minimum) is required to pick up the type of views you were able to obtain?




This comet is going to be visible in the northern hemisphere for most of its visit to the inner solar system. In the fall it will become a morning object (sadly for this night-owl). It will be lost in the sun's glare near the end of November then will gradually become circumpolar so it should be a good telescope object for more than a year (if it survives its solar visit).

As for equipment, you need to be able to detect magnitude 16 objects with your equipment in order to see this. If you've a good mount that can do 60 second images without star elongation, I'll bet you'd be able to image this. Visually it would need a pretty big piece of glass I imagine. I doubt I could detect it with my 10" dob.


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5629857 - 01/18/13 12:20 PM

I should say you need mag 16 equipment for now. With any luck this guy will be naked eye at its peak.

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canukLX90
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5631576 - 01/19/13 01:26 PM

A very nice image update on the comet. Thanks for posting.

PJ


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: canukLX90]
      #5676972 - 02/13/13 02:51 AM Attachment (64 downloads)

6x5 mins from tonight. I tried to calculate magnitude and got 16.0 tonight so I don't think my process is right- it shouldn't be getting dimmer. It was a bit hazy tonight so maybe that affected things.

Edited by John Wunderlin (02/13/13 02:52 AM)


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5676983 - 02/13/13 03:00 AM

Definitely looks like a tail is developing. I'll keep North up in all my images.

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Rich (RLTYS)Moderator
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5677169 - 02/13/13 07:55 AM Attachment (62 downloads)

Here's my image of Ison taken 2/11 which shows a short, stubby tail pointing in a east/southeast direction.

Rich (RLTYS)


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: Rich (RLTYS)]
      #5677465 - 02/13/13 11:12 AM Attachment (54 downloads)

I forget how bright my laptop's screen is- I can't see the tail on my work PC. Here's my inverted version.

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John Wunderlin
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Re: C/2012 S1 ISON new [Re: Rich (RLTYS)]
      #5677478 - 02/13/13 11:17 AM

Quote:

Here's my image of Ison taken 2/11 which shows a short, stubby tail pointing in a east/southeast direction.

Rich (RLTYS)




Thanks Rich- looks like we've got the same guy


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Tonk
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5677561 - 02/13/13 12:00 PM

Quote:

I tried to calculate magnitude and got 16.0 tonight so I don't think my process is right- it shouldn't be getting dimmer.




It *is* getting dimmer. There are numerous reports that its dropped 0.5 to 0.8 mags in the last 3 nights.

One idea - yet to be confirmed - is that it is at a small phase angle at present and the phase angle is is now slowly increasing. This could indicate that the comet has been "unnaturally" bright due to back scattered light off dust particals and the comet is actually returning to its "natural" brightness as back scatter diminishes


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: Tonk]
      #5677567 - 02/13/13 12:03 PM

Excellent! I was hopeful that I could track the magnitude over time, but thought I must be doing something wrong. Thanks much!

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Special Ed
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5678323 - 02/13/13 08:40 PM

John & Rich--your images of this very dim comet still out around the orbit of Jupiter (~4 AU) are impressive. Keep up the good work--maybe I'm a weenie but I'm not even going to look visually for this intruder from the Oort Belt until it get closer in. In the meantime thanks for the updates.

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canukLX90
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5678705 - 02/14/13 02:05 AM

John, Rich: thanks for posting your imaging efforts.
This is a challenging chase with this fuzz ball being so
far out.

PJ


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hiro
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Re: C/2012 S1 ISON new [Re: canukLX90]
      #5697714 - 02/24/13 02:20 AM

Hi all,

Sky was clear and dark for a while on February 9, 10, 11, and 13, 2013, though the seeing was bad due to the strong jet stream here in this season. I tried imaging of the comet with my small scope, Takahashi FSQ-106ED and extender Q1.6x at D106/F850.

I could get 119 frames of the comet, exposure for 6 minutes, about 12 hours in total. The image of the comet looked tiny, and I scaled it up by 5 times with IRIS hoping that the number may be some help.

Here is the result.
http://www.flickr.com/photos/hiroc/8501810109/

Edited by hiro (02/24/13 02:35 AM)


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Tonk
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Re: C/2012 S1 ISON new [Re: hiro]
      #5697828 - 02/24/13 06:17 AM

Whoa - thats some effort Hiro! Nice result

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hiro
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Re: C/2012 S1 ISON new [Re: Tonk]
      #5697862 - 02/24/13 08:03 AM

Thanks Tonk,

I planned to try dithering technique with drizzle command of IRIS, but I could not do it this time.
Here is a command list of IRIS and link to dithering technique.
http://www.astrosurf.com/buil/iris/nav_pane/CommandsFrame.html

Edited by hiro (02/26/13 07:20 PM)


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: hiro]
      #5709312 - 03/02/13 06:30 PM Attachment (32 downloads)

Here's my data from last night. I'll try to calculate the magnitude later today if I have time. This was 18x5min bin 1x1. 10" LX50 @ f/6.3, ST8300.

Edited by John Wunderlin (03/02/13 06:31 PM)


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5709420 - 03/02/13 07:32 PM

Magnitude 15.4

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hiro
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5710043 - 03/03/13 07:25 AM

Hi,

C/2012 S1 ISON on February 10, 2013 again.



I have updated the image, scaled up x5 earlier, and it got a little more precise.

Here is the original.

http://www.flickr.com/photos/hiroc/8523305073/

Thanks.

Edited by hiro (03/03/13 07:47 AM)


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canukLX90
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Re: C/2012 S1 ISON new [Re: hiro]
      #5723357 - 03/10/13 04:23 AM Attachment (44 downloads)

Very nice effort. Thanks for posting.
There was a clear night here, finally, and I managed to
image the comet. Attached is 5 X 3 minutes at ISO 800.
The object marked at mag 17.5 is a galaxy. The comet is
still over 4 AU from the earth and the sun and is moving
at around 19 arcsec / hour.

PJ


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canukLX90
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Re: C/2012 S1 ISON new [Re: canukLX90]
      #5723359 - 03/10/13 04:27 AM Attachment (39 downloads)

Attached is a crop resized to show a bit more detail. For
this image stack I used the comet versus the stars. The
tail seems quite broad to me with a well defined nucleus.

PJ


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buddyjesus
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Re: C/2012 S1 ISON new [Re: canukLX90]
      #5724282 - 03/10/13 04:54 PM

now those pics are going deep. gj

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John Wunderlin
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Re: C/2012 S1 ISON new [Re: buddyjesus]
      #5724546 - 03/10/13 07:23 PM

Looking good guys! I'm clouded out for a few days. I hope I get a chance to see Panstarrs too.

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AXAF
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5731647 - 03/14/13 05:31 AM Attachment (44 downloads)

Here is my most recent image of Comet ISON, taken on 3/14/13 at 04:30UT. It is a 20 minute exposure using a 0.50-m f/6.8 astrograph and a FLI ProLine PL11002M CCD camera.

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Jure Atanackov
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Re: C/2012 S1 ISON new [Re: AXAF]
      #5732094 - 03/14/13 11:41 AM

I'm beginning to wonder if the early expectations of comet ISON becoming as spectacular as the Great comet of 1680 (some even compared it with the Great september comet of 1882…) were just a bit too optimistic. At this time the comet isn't looking intrinsically very bright. Right now it's about magnitude 15. Its heliocentric magnitude is ~12.0. At the same heliocentric distance (4.5 a.u.), comet PanSTARRS was 1-1.5 magnitudes brighter. Similar to comet PanSTARRS, ISON also appears dynamically new. I can’t help but wonder if ISON will follow PanSTARRS’ photometric development, but perhaps a magnitude or so fainter. Maybe H0~6.5 or so and n~3. On a more positive note, the comet appears quite dusty – its morphology is actually quite similar to comet PanSTARRS at the same heliocentric distance. It has a small, compact coma and a developing dust tail. A very dusty nature of the comet would also explain the brightness bump around opposition, when its brightness would have been increased by backscattering. At H0~6.5 the comet would still be above the Bortle survival limit and still at least 4 magnitudes brighter than comet Lovejoy. So its perihelion survival probably isn’t questionable, but I really wonder if it will become as bright and spectacular as first expected...
CS!Jure


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OldDeadOne
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Re: C/2012 S1 ISON new [Re: Jure Atanackov]
      #5732607 - 03/14/13 05:30 PM

All we can do is hope that it is spectacular when it is viewable this fall,I know I am I want a nice naked eye with a nice tail comet winking it's eye at me.

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Tonk
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Re: C/2012 S1 ISON new [Re: Jure Atanackov]
      #5732661 - 03/14/13 06:04 PM

I think you might well be right - those concerns have been expressed on Comets-ML

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aa6ww
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Re: C/2012 S1 ISON new [Re: Tonk]
      #5740043 - 03/18/13 03:15 AM

I'm looking forward to tracking comet ISON as soon as its observable in my C14. Comets are my favorite objects to track, its the one thing I like to look for every time theres a new moon and I'm out with my largest scope..

...Ralph


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Re: C/2012 S1 ISON new [Re: aa6ww]
      #5740347 - 03/18/13 09:54 AM

I share Jure's concerns about the actual potential for Comet ISON to become a truly spectacular object, at least in the eyes of the average amateur astronomer and likewise the general public. I have little current doubt that it will do at least as well as did Comet Lovejoy last year. However, one must keep in mind that for nearly all its southern observers and the astrophotographers they saw it largely under very dark sky conditions, a situation unlikely to prevail for the average northern hemisphere observer.

For objects like Comet ISON, what is actually seen and the degree of spectacle presented is often highly dependent of the clarity and sky darkness enjoyed by the observers...especially once the comet is a couple of weeks, or more, past perihelion and finally well placed in the sky.

BrooksObs

Edited by BrooksObs (03/18/13 09:57 AM)


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hiro
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #5768060 - 03/31/13 04:04 AM

Hi,

C/2012 S1 (ISON) on March 11, 2013UTC.



The tail looks to be a little longer compared to my last image in February 10th. above with the same small imaging train and in the same scale. North is up. Here is the original.
http://www.flickr.com/photos/hiroc/8605547812/

Thanks.

Edited by hiro (03/31/13 04:10 AM)


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: hiro]
      #5771944 - 04/01/13 11:14 PM Attachment (33 downloads)

March 31, Magnitude 14.4. I had to remove the nearby star in photoshop in order to measure the magnitude so this may be off slightly. 30 minutes of 3 minute subs. Also was very hard to stack on comet so it's a little blurry... oh well better luck next month.

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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5772884 - 04/02/13 01:00 PM Attachment (43 downloads)

Nice work John and Hiro . My brief shot below from last night Apr 1st with comet now in Auriga

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canukLX90
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Re: C/2012 S1 ISON new [Re: nytecam]
      #5775659 - 04/03/13 01:57 PM

Hiro, John, nytecam good work on keeping track of this
fuzz ball and posting your images.

PJ


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Re: C/2012 S1 ISON new [Re: canukLX90]
      #5824808 - 04/26/13 04:30 PM

Just came across this thread. There are some nice images presented here. Keep up the good work.

I too have been following this comet and here are my imaging efforts (not intended for photometry) over the last few months. However, I don't think I'll get many more, since my house will be in the way soon.

http://www.pbase.com/jshuder/c2012_s1_ison

Jim S.


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: jshalpha]
      #5829223 - 04/28/13 10:07 PM

Nice ones Jim,- hoping to get some more data tonight.

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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #5829308 - 04/28/13 10:57 PM

whats ISON's magnitude right now. Im going to a dark site location in a few weeks with my C14, i wonder if its in the Mag 14 range now to detect it easily?

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BrooksObs
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Re: C/2012 S1 ISON new [Re: aa6ww]
      #5829736 - 04/29/13 09:24 AM

The most recent visual sighting seems to have been reported about two weeks ago, at +15.5 , while perhaps more reliable imaging techniques indicate closer to +17. Thus, ISON continues to be an excedingly difficult object even with the very largest of amateur telescopes as it continues to close with the Sun and apparently is not brightening at all.

I would point out that more "healthy" comets are often considerably brighter when reaching ISON's current solar distance. Comet Hale-Bopp was even visible with just ordinary binoculars by this time. Likewise, the ultimate brightness for ISON continues to be scaled back, with the comet now anticipated to likely be brighter than 2nd magnitude only for a few days either side of perihelion (when visible only in very bright twilight).

BrooksObs

Edited by BrooksObs (04/29/13 09:33 AM)


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REC
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #5829759 - 04/29/13 09:41 AM

NASA just released an updated image for it and looks pretty good!

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Re: C/2012 S1 ISON new [Re: REC]
      #5829805 - 04/29/13 10:09 AM

Yes, REC, a pretty picture, but taken by one of the most powerful of telescopes there is. Comet PanSTARRS looked promising, too, a couple of months prior to its perihelion based on images by even much smaller instruments. We know how disappointing that one turned out to be after all the hype that surrounded it.

PanSTARRS and ISON appear to share a high degree of dust production while still quite some distance from the Sun. However, ISON seems to be intrinsically only about 1/5 the brightness of PanSTARRS. The combination is not particularly indicative of a comet with great prospects, I'm afraid.

BrooksObs

Edited by BrooksObs (04/29/13 10:10 AM)


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MDavid
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #5829949 - 04/29/13 11:19 AM

Quote:

...We know how disappointing that one turned out to be after all the hype that surrounded it.

PanSTARRS and ISON appear to share a high degree of dust production while still quite some distance from the Sun. However, ISON seems to be intrinsically only about 1/5 the brightness of PanSTARRS. The combination is not particularly indicative of a comet with great prospects, I'm afraid.

BrooksObs




Personally, my family and I really enjoyed PanSTARRS as we had a great time seeing it adjacent to the waxing 1% illuminated crescent moon (using 9x63 binos). It was magnificent and it was my kids first comet. I suppose it helps going in to never believe the hype and have a little history to fall back on...I'll echo Fred L. Whipple, "If you must bet, bet on a horse, not a comet!"

Clear Skies!


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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #5829969 - 04/29/13 11:32 AM

Quote:

The most recent visual sighting seems to have been reported about two weeks ago, at +15.5 , while perhaps more reliable imaging techniques indicate closer to +17




I've been using a CCD with CCDOps software to calculate the magnitudes in this thread which seem to be fairly close to what others have reported. It appears the comet has dimmed once more, but it is clearly still brighter than Mag 16 in my data- in my data from last night it was right next to a mag 15.9 star and is clearly brighter than that. I'm hoping to have my latest results processed in a couple of days.

ISON seems to be even less predictable than past comets, but it's going to be very close to the Sun- should be a good show even if it doesn't live up to the ridiculous hype... Visible during the day? Sure it will lol.


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REC
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #5830128 - 04/29/13 12:57 PM

I went to a lecture at the NEAF show about ISON. It was by Bob Berman from S&T and although he was optimistic about it in his talk, there seemed to be just a small lack of enthusiasm I detected about how great it would really be. He is taking a tour group to see it in the morning skies from Chili and it sounded like it will be brighter then it will be after sunset in the north.

So we shall see later this year about it's prospects. I would sure like it to be like Hale-Bopp or brighter:)

Bob


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hiro
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Re: C/2012 S1 ISON new [Re: REC]
      #5831672 - 04/30/13 07:26 AM

I imaged the comet through the short dark window on April 28, 2013.
The comet looks to be around magnitude 15.5 compared to the surrounding stars.



The original is in my flickr page as usual.
http://www.flickr.com/photos/hiroc/8695598456/

Thank you for looking.


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Rich (RLTYS)Moderator
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Re: C/2012 S1 ISON new [Re: hiro]
      #5835693 - 05/02/13 06:46 AM

I also just recently imaged Ison and its still not really brightening. I'm really starting to wonder...

Rich (RLTYS)


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Tonk
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Re: C/2012 S1 ISON new [Re: Rich (RLTYS)]
      #5836608 - 05/02/13 03:42 PM

Take a look at the predicted light curves and the measured brightness (bottom of page here - http://www.aerith.net/comet/catalog/2012S1/2012S1.html )

Starting to tell a story It all started to go wrong back in January


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Rich (RLTYS)Moderator
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Re: C/2012 S1 ISON new [Re: Tonk]
      #5837683 - 05/03/13 06:06 AM

Dosen't look too good.

Rich (RLTYS)


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Re: C/2012 S1 ISON new [Re: Rich (RLTYS)]
      #5856536 - 05/12/13 11:05 PM

Saw it visually on Friday, that was through a 25" goto reflector, not impressed, very small, looked like a planetary nebula no tail was visible. It was there, but seriously not impressive at all. If it wasn't for goto and the Sky would never have guess it was a comet.

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Re: C/2012 S1 ISON new [Re: hfjacinto]
      #5859359 - 05/14/13 08:45 AM

In my opinion the situation with ISON is trending toward the likelihood of its becoming another Comet Lovejoy: an object which with decreasing heliocentric distance will show only relatively limited activity and remain fairly obscure prior to reaching perihelion. As it rounds the Sun ISON's nucleus will either undergo a disruption event, or experience a dramatic dust-release. Either instance will result in the generation of an enormous, but only briefly fairly bright tail, the entire object fading out much sooner than most will be anticipating. Prime observability will be limited to just a week, or two, in early December before the "big" comet may seem to evaporate almost overnight into nothingness.

This scenario has played out in sun-skirting/sungrazing comets a surprising number of times over the last two centuries. Probably one of the best recent examples (beyond C/Lovejoy) being C/Wilson-Hubbard in 1961.

BrooksObs

Edited by BrooksObs (05/14/13 09:09 AM)


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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #5921069 - 06/14/13 06:50 PM

Here's a new article about ISON: Sky and Telescope If it's anything like the pictures I've seen of Lovejoy than I'm really looking forward to it.

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BrooksObs
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Re: C/2012 S1 ISON new [Re: krp]
      #5921919 - 06/15/13 09:56 AM

Quote:

Here's a new article about ISON: Sky and Telescope If it's anything like the pictures I've seen of Lovejoy than I'm really looking forward to it.




Just appreciate that the images of C/Lovejoy we all ooohed and aaahed over were the result of extended exposures and don't necessarily reflect what a visual observer could see at the same time. In fact, when Lovejoy's tail was reaching around 35 and 45-degrees on forced images virtually nothing at all had been visible to the naked eye for quite some time.

BrooksObs


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krp
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #5929499 - 06/19/13 03:10 PM

Quote:

Quote:

Here's a new article about ISON: Sky and Telescope If it's anything like the pictures I've seen of Lovejoy than I'm really looking forward to it.




Just appreciate that the images of C/Lovejoy we all ooohed and aaahed over were the result of extended exposures and don't necessarily reflect what a visual observer could see at the same time. In fact, when Lovejoy's tail was reaching around 35 and 45-degrees on forced images virtually nothing at all had been visible to the naked eye for quite some time.

BrooksObs



I realize that, I'm hoping to get some long exposure shots of the comet myself.
It just occurred to me that the best time to view the comet (December 10-14) coincides with the Geminid meteor shower on the 13 and 14th. Both of them should be visible in the pre-dawn sky. The waxing gibbous moon will be up most of the night but after it sets there will be 1-2 hours of darkness. That's something I don't want to miss, I might have to head south if the comet lives up to expectations.

Edited by krp (06/19/13 03:26 PM)


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zeldaboy101
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Re: C/2012 S1 ISON new [Re: krp]
      #5974372 - 07/16/13 03:05 PM

NASA just released a timeline on Comet ISON that includes which missions will be observing the comet along with a couple of key dates for it.

So far:
Deep Impact SWIFT
Spitzer
Swift
Hubble

Up next:
BRRISON
Curiosity
Opportunity
Hubble again
MESSENGER
FORTIS
Stereo-A
Stereo-B
SOHO
SDO

http://www.nasa.gov/content/goddard/timeline-of-comet-ison-s-dangerous-journey/


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Re: C/2012 S1 ISON new [Re: zeldaboy101]
      #5975676 - 07/17/13 10:05 AM

Well its bound to fizzle out now that lot is looking - would put anyone off

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John_G
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Re: C/2012 S1 ISON new [Re: Tonk]
      #5976604 - 07/17/13 06:41 PM Attachment (101 downloads)

PDF for ISON Jan/14 attached. 15x70s.

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Re: C/2012 S1 ISON new [Re: John_G]
      #5997987 - 07/30/13 08:53 AM

http://www.dailymail.co.uk/sciencetech/article-2381271/Has-comet-century-fizz...

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BrooksObs
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Re: C/2012 S1 ISON new [Re: BSJ]
      #5998313 - 07/30/13 12:15 PM

It would be so much better for all concerned if only the "media" would limit itself to just reporting on political slop and TV's "reality" shows. The media - with the assistance of a few "spokesman scientists" - have managed to spin the ISON prognostications to so many extremes since the comet's discovery that anyone in the general public must by now regard all astronomers as idiots and I would not blame them.

As far as I am concerned, the topsy-turvy ISON story has grown to become worse than the Kohoutek flap of 1973 ever was. And now we are seeing conclusions being drawn and presented as new infomation when, in fact, there has been absolutely no new data taken on the comet's development in 4-6 weeks! This is science? I'm almost ashamed.

BrooksObs

Edited by BrooksObs (07/30/13 12:41 PM)


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Tonk
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6003129 - 08/02/13 12:24 PM

Calm down John This is the UK's Daily Mail which is well known for publishing hyperbole and fiction and dressing it up as fact. Brits are largely not fooled by such antics (other than the Daily Mail's loyal following - a certain gullible type!). I'd be far more concerned if such wild claims of large tailed super bright comets turned up in the Independent.

However most of the info in the article appears reasonable - its just the headline that grates as it clearly just a attention grabber by quoting the hyperbole aspect


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Octans
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Re: C/2012 S1 ISON new [Re: Tonk]
      #6004235 - 08/03/13 01:17 AM

Quote:


However most of the info in the article appears reasonable - its just the headline that grates as it clearly just a attention grabber by quoting the hyperbole aspect




That reminds me of one of the worst offenders -- weather.com. One time, it featured an article on the comet just like any other of the hundreds you see out there...except on their front page, they linked it with a title something like "Comet Headed STRAIGHT For Earth" with a picture of some massive asteroid impacting the planet. The article itself was reasonable (although I don't think they wrote it).


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Re: C/2012 S1 ISON new [Re: Octans]
      #6004757 - 08/03/13 12:31 PM

Wouldn't sungrazers be the hardest to predict? It seems the comet could be anything from the comet of the century to completely vaporize and never be seen again.

I remember many years ago Bortle was quoted in the Boston Globe as saying that Comet Hyakutake would be the one to see (over Hale-Bopp). I think he got that one right.


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Re: C/2012 S1 ISON new [Re: Alvan Clark]
      #6004807 - 08/03/13 01:02 PM

Quote:

Wouldn't sungrazers be the hardest to predict? It seems the comet could be anything from the comet of the century to completely vaporize and never be seen again.



They're actually rather easy to predict: just predict that they'll fizzle and you'll almost always be right.

The hard ones to predict seem to be the short period comets with multiple returns which have relatively large perihelion distances. Halley (1/P) was about 2 mags fainter than predicted at its 1986 return; OTOH Holmes (17/P) overperformed by at least 10 mags at its 2007 return. And don't forget Schwassmann-Wachmann (29/P) which has a near circulr orbit with a perihelion outside Jupiter's orbit yet is pretty unpredictable, with flare-ups of several magnitudes at irregular intervals.

Quote:

I remember many years ago Bortle was quoted in the Boston Globe as saying that Comet Hyakutake would be the one to see (over Hale-Bopp). I think he got that one right.



Yes, Hyakutake was a spectacular sight - but only if you had a good dark sky in the few days when it was close to Earth.


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BrooksObs
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Re: C/2012 S1 ISON new [Re: brianb11213]
      #6004835 - 08/03/13 01:23 PM

Quote:

Quote:

Wouldn't sungrazers be the hardest to predict? It seems the comet could be anything from the comet of the century to completely vaporize and never be seen again.



They're actually rather easy to predict: just predict that they'll fizzle and you'll almost always be right.

The hard ones to predict seem to be the short period comets with multiple returns which have relatively large perihelion distances. Halley (1/P) was about 2 mags fainter than predicted at its 1986 return; OTOH Holmes (17/P) overperformed by at least 10 mags at its 2007 return. And don't forget Schwassmann-Wachmann (29/P) which has a near circulr orbit with a perihelion outside Jupiter's orbit yet is pretty unpredictable, with flare-ups of several magnitudes at irregular intervals.

Quote:

I remember many years ago Bortle was quoted in the Boston Globe as saying that Comet Hyakutake would be the one to see (over Hale-Bopp). I think he got that one right.



Yes, Hyakutake was a spectacular sight - but only if you had a good dark sky in the few days when it was close to Earth.




Whoa there!

When intrinsically brighter than magnitude +7.0 true Kreutz sungrazing comets carry a virtual guarantee of being spectacular. They are perhaps the easiest of all to predict. Only the related tiny cometary shards seen by the SOHO, et al., satellites behave erratically.

On the other hand, other small perihelion distance comets (they are not rightly to be considered as sungrazers), like ISON, PanSTARRS, and McNaught, are shots in the dark when predicting their post-T brightness.

As for P/Halley during its 1986 apparition, it followed closely the lightcurve predicted for it that was presented by Bortle and Morris...one based on brightness activity observed during past apparitions. Thus, the comet was just about on the mark in regard to its brightness. It was the tail's poor performance that deviated markedly from early apparitions.

Hyakutake was indeed a dramatically more impressive comet with the unaided eye than Hale-Bopp, albeit not nearly as long lasting.

BrooksObs

Edited by BrooksObs (08/03/13 01:26 PM)


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ericj
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6007483 - 08/05/13 12:01 PM

Hi,

Mars and Comet C/2012 S1 ISON will be within two degrees of each other in the morning sky in September 2013 and within one degree of each other in October 2013.

I was using SkyMap Pro recently to get an idea of how high in the sky Comet C/2012 S1 ISON will be in the fall.

I noted that Mars and Comet C/2012 S1 ISON will be with two degrees of each other in the morning sky in September 2013 and within one degree of each other in October 2013. So using SkyMap Pro I generated sky maps as they may be helpful to observers attempting to locate the comet.

In addition I have included tables listing the phases of the Moon for September and October.

The first map shows the track of Mars and Comet C/2012 S1 ISON from September 15th through October 15th. Both Mars and Comet C/2012 S1 ISON are in the constellation of Cancer in September and are in Leo in October.

On the maps there are track marks for every five days. The track marks on the left are Comet C/2012 S1 ISON while the tracks on the right are Mars. You will note that over time they are getting closer to each other.

The second map below shows the approximate 4 degree field of view through my TMB 105mm with a TMB 40mm 2" Paragon of Mars and Comet C/2012 S1 ISON on September 15th. It indicates that both Mars and the comet should fit into the same field of view.

However at this point it appears that the comet will develop more slowly in the autumn sky than originally thought, and may not reach naked eye visibility until November.

On the other hand if you have access to dark skies and a larger aperture telescope or do astrophotography you may be able to use Mars as a guide to locating the comet.

Here is a link to the sky maps and tables listing the phases of the Moon for September and October:

http://ejamison.net/recent_obs11.html#1

Clear Skies,

Eric Jamison

http://ejamison.net/index.html


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stevecoe
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Re: C/2012 S1 ISON new [Re: ericj]
      #6007666 - 08/05/13 01:42 PM

Eric;

Thank you very much, this looks like an excellent observing opportunity. I plan to try some wide field imaging, maybe 200mm lens, and observing with the 16 inch. Lots to do.

Clear skies to us all;
Steve Coe


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HurricaneWhisper
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Re: C/2012 S1 ISON new [Re: stevecoe]
      #6008440 - 08/05/13 09:46 PM

Is there a way to determine the best viewing location in terms of longitude and latitude?

Assuming lower 48 states locales only, nearest I can tell is that you want to be as far south as possible while still being in dark cloudless skies. I believe high elevation is a plus while unobstructed views of the horizion is a must.

I am basing this on the assumption of getting the comet to be as high in the sky as possible.

For me, I believe Big Bend Country in Texas would be the best viewing location due to southern latitude, high elevation, dark skies, lack of humidity, etc.

I also wonder what the best location globally is. Is there an optimum Latitude?

Panstaars was very low on the horizon when we viewed it and was basically chasing the sunset so closely that the dusk washed it out.


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ericj
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Re: C/2012 S1 ISON new [Re: stevecoe]
      #6008970 - 08/06/13 08:50 AM

Hi Steve,

Your welcome. Yes it does look like it may offer opportunities for both observing and astrophotography.

Best,

Eric


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BrooksObs
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Re: C/2012 S1 ISON new [Re: HurricaneWhisper]
      #6009201 - 08/06/13 11:18 AM

Quote:

Is there a way to determine the best viewing location in terms of longitude and latitude?






It will all depend on just how the comet performs post-perihelion.

In the first week following its closest approach to the Sun the southern states in the U.S. will be slightly favored. On the otherhand, should a spectacular tail develop in the 10-15 day interval post-T, then those in more mid-northern latitudes would be in the best position for the most impressive views.

ISON's path across the sky after swinging by the Sun (assuming its survival of the encounter) is totally the opposite of what Pans-DUD followed. ISON moves rapidly up out of the morning twilight and moves steadily northward to reveal itself well up in the dark northeastern pre-dawn sky.

BrooksObs

Edited by BrooksObs (08/06/13 11:20 AM)


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GlennLeDrew
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Re: C/2012 S1 ISON new [Re: HurricaneWhisper]
      #6010523 - 08/06/13 10:55 PM

Quote:

Is there a way to determine the best viewing location in terms of longitude and latitude?

Assuming lower 48 states locales only, nearest I can tell is that you want to be as far south as possible while still being in dark cloudless skies. I believe high elevation is a plus while unobstructed views of the horizion is a must.

I am basing this on the assumption of getting the comet to be as high in the sky as possible.

For me, I believe Big Bend Country in Texas would be the best viewing location due to southern latitude, high elevation, dark skies, lack of humidity, etc.

I also wonder what the best location globally is. Is there an optimum Latitude?

Panstaars was very low on the horizon when we viewed it and was basically chasing the sunset so closely that the dusk washed it out.




The optimum latitude is that which has the comet standing vertically above the Sun at the moment of observation.

For objects fairly far from the Sun on the sky, this can cause the 'optimum' latitude to even vary somewhat during the night. For comets not angularly far from the Sun, the situation is more straightforward. But the optimum latitude can vary--sometimes surprisingly so--from night to night.

Using planetarium software which plots the comet, and allows to show the Sun when below the horizon, you can explore this on different dates (and times, too) by altering the latitude until the comet is straight above the Sun.


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Re: C/2012 S1 ISON new [Re: GlennLeDrew]
      #6010997 - 08/07/13 08:21 AM

Any idea if NASA or JHU published photos taken by the Far-ultraviolet Off Rowland-Circle for Imaging and Spectroscopy (FORTIS) telescope... if any were taken?

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PhilCo126
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Re: C/2012 S1 ISON new [Re: PhilCo126]
      #6012948 - 08/08/13 06:23 AM

Here's the answer thx to Dr McCandliss:
FORTIS is still in the experimental stage and the May 2013 launch went great and acquired an image, but it suffered from a high level of background geocoronal Lyman alpha. FORTIS team is fabricating baffles to eliminate this problem. If we are successful in our ground tests we intend to fly medio November 2013 to collect both images and spectra from comet 2012 S1 ISON in the far-UV.


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Re: C/2012 S1 ISON new [Re: PhilCo126]
      #6014007 - 08/08/13 03:38 PM

http://theskylive.com/ison-tracker

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Re: C/2012 S1 ISON new [Re: PhilCo126]
      #6061354 - 09/03/13 05:18 PM

On page 2 of October's "Astronomy" magazine Celestron has an advertisement for equipment to view ISON. The top third of the ad features a beautiful night scene with a Great Comet in it. I assume it is a rendition of what ISON is hopefully going to look like. Yet the comet in this rendition is horizontal. Is this correct or did Celestron just not do its homework? Am I correct that ISON will be vertical, especially at its peak in magnitude?

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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6062143 - 09/04/13 05:23 AM

Quote:

On page 2 of October's "Astronomy" magazine Celestron has an advertisement for equipment to view ISON. The top third of the ad features a beautiful night scene with a Great Comet in it. I assume it is a rendition of what ISON is hopefully going to look like. Yet the comet in this rendition is horizontal. Is this correct or did Celestron just not do its homework? Am I correct that ISON will be vertical, especially at its peak in magnitude?



Just delete the comet altogether, that will be a much more accurate representation of the apparition of Comet Ison.

It's bad enough having higgerant "science" reporters overblowing these things. To have a misrepresentation like this in an advertisement is criminal.


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Re: C/2012 S1 ISON new [Re: brianb11213]
      #6064471 - 09/05/13 01:36 PM

ISON is currently around mag 11-12 and low to the horizon. Observers are back onto it as its recently exited solar conjunction a couple of weeks back.

However it will soon start to close the gap to the sun again as it races to its very close perihelion. Its the post perihelion period when we get a chance to see it at much more favourable elongations.

Note that the comet is actually only going to be bright for a short period - when its only a few degrees from the sun in the daylight sky! This seems be a point that many reporters to have totally neglected.

My personal bet its that it will perform much like PanSTARRS did back in March/April. I.e. when it gets deep enough in dark skies it will have dimmed significantly but still visible to the naked eye for a week or so.


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Re: C/2012 S1 ISON new [Re: Tonk]
      #6064610 - 09/05/13 02:51 PM

I imaged it a few days ago but haven't had time to check my data for the magnitude. My prediction: less than 'comet of the century', more than 'complete dud'

I'm hoping it's naked eye visible for more than a week, in fact I would be willing to bet you a can of soda that it's naked eye for at least 2 weeks- any takers? You'll have to come to Mineral Point for your payout


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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6065136 - 09/05/13 08:17 PM

I've been telling folks that 80-90% of comets don't live up to the hype and I suspect this will be no exception. "Astronomy" magazine is going to have a lot of explaining to do if skeptics like us are right. On page 57 of January's edition the hype began and on Feb (page 4) it really took off. Hopefully I haven't wasted my money by ordering the special edition they've been advertising.
It seems as if the magazine has started to back off a little in October's edition by questioning ISON's ability to become a Great Comet (bottom of page 49).
Also, I noticed an error on the bottom of page 42. It says "Avoid observing from sites east of a city so you won't have to look through a veil of light pollution."
The problem is that the comet will be in the east so you WANT to be east of the city to avoid light pollution.

Edited by CygnuS (09/05/13 08:22 PM)


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MessiToM
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6069640 - 09/08/13 02:37 PM

We just got to hear Dr. Carey Lisse, head of NASA’s Comet ISON Observing Campaign speak at a star party about ISON on 9/7/13 and he said he would bet his first born child that this will be a "Kohoutek mark 2" and by alot of charts and graphs of magnitudes orbital elements and such its trendng JUST like Kohoutek did.

http://www.isoncampaign.org/

Edited by MessiToM (09/08/13 02:47 PM)


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Tonk
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6069979 - 09/08/13 05:37 PM

Quote:

this will be a "Kohoutek mark 2"




Indeed - but then again it was observing Kohoutek when I was 14 that hooked me into astronomy. At the time I didn't know it was supposed to be a "comet of the centaury"! so I just enjoyed finding it with binoculars and drawing it


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MessiToM
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Re: C/2012 S1 ISON new [Re: Tonk]
      #6070186 - 09/08/13 08:20 PM

Personally I would be satisfied with a Kohoutek like comet. I wasnt alive when it was here but from pictures and info it seemed descent.

IIRC he guessed mag -5. Dont hold me to that though.


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CygnuS
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6070392 - 09/08/13 10:45 PM

When you're an experienced comet observer, hearing these predictions can be fun. It's almost like hearing sports analysts guess what's going to happen when they're chattering before a game. That's just part of it.
Reasonable fans listening to the chatter are still aware that their team could lose despite what's being said.
However when astronomers talk the public tends to take them pretty serious, thinking they know all the facts. That's why it's important to add disclaimers when talking about an upcoming "comet of a lifetime." Sometimes the public gets so excited they don't hear the disclaimer but we always have to try telling them anyways.


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CygnuS
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6070394 - 09/08/13 10:47 PM

By the way, I just learned that Comet West was pronounced Comet Vest. You learn something every day.

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BrooksObs
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6070471 - 09/08/13 11:52 PM

Quote:

Personally I would be satisfied with a Kohoutek like comet. I wasnt alive when it was here but from pictures and info it seemed descent.

IIRC he guessed mag -5. Dont hold me to that though.




In fact, Kohoutek very briefly attained about -3, but that phase lasted only a few hours and came at a time when the comet was unobservable from the ground. The first post perihelion sightings caught it at about zero magnitude, yet just 3 days thereafter it was already 3rd magnitude.

Kohoutek wasn't a very worthwhile sight unless you were situated out in the country with class 1 or 2 skies. Already having seen a number of truly good comets by then, I ranked Kohoutek as no more than a mediocre object, at best.

Brooks Obs


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brianb11213
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6070682 - 09/09/13 04:49 AM

Quote:

When you're an experienced comet observer, hearing these predictions can be fun. It's almost like hearing sports analysts guess what's going to happen when they're chattering before a game. That's just part of it.



Actually the pre-match "analysis" is what really turns me off sports broadcasts. The actual games aren't too bad. I don't think I'm the only one who wouldn't be unhappy if all the sports pundits could be made to vanish permanently.

Scientists, and science journalists, ought to know better.

There are only two predictable things about comets: their orbits, and the fact that the vast majority of them perform well below predictions.


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Tonk
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Re: C/2012 S1 ISON new [Re: brianb11213]
      #6070741 - 09/09/13 06:36 AM

Some observers are reporting ISON's recent magnitude with values ranging between 11.8 and 12.4 for 7th September - this is current play - not pre-match chatter (Source CometsML @ YahooGroups). These might be slightly under estimated too as the comet is low in the sky

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MessiToM
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6070855 - 09/09/13 08:56 AM

Quote:

By the way, I just learned that Comet West was pronounced Comet Vest. You learn something every day.




YES and wild isn't like wild west its willd lol I didn't know either.


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evilaviator
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6070864 - 09/09/13 09:01 AM

I've been keeping an eye on ISON with this website.

http://theskylive.com/ison-tracker


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Jarad
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Re: C/2012 S1 ISON new [Re: evilaviator]
      #6071412 - 09/09/13 02:13 PM

Well, even if it isn't the "comet of the century", we may get a couple of nice views. I am planning to be out early with the bino's on Nov 24 - Ison, Encke, Mercury and Saturn will all be rising and within about 6 degrees of each other at around 6:30AM that day. Ison and Encke will be within about 2 degrees of each other - two comets in the FOV in binos should be nice, even if they aren't naked-eye visible. nice opportunity for some wide-field astrophotograhers, too. You just need to make sure you have a good view down to the horizon to the east.

We'll see how it does after perihelion. Could be really nice if it survives, but I'm not that confident it will - could go "poof" that close to the sun.

Jarad


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CygnuS
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Re: C/2012 S1 ISON new [Re: Jarad]
      #6071937 - 09/09/13 07:23 PM

This Oct 15 alignment of Mars, Regulus and ISON sounds like it might be sweet. Regulus will be 2 degrees from ISON and Mars will be smack dab in between, a degree from each.

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Tonk
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6072641 - 09/10/13 05:59 AM

Ok so Regulus and Mars will be observable but ISON will be drowned out by the others

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aa6ww
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Re: C/2012 S1 ISON new [Re: Tonk]
      #6073017 - 09/10/13 11:15 AM

So has anyone seen comet ISON yet?

I went out sat night for an all nighter, with my 180mm APM/TMB F6 refractor and a friend was using his LX-200 12" Meade SCT and we were hoping to get an early morning chance to hunt down Comet ISON but it was just too low for us to find. The Atmosphere that low that early was more than the seeing would allow. We just barely was able to pic out Mars and the Beehave was almost invisible, despite the skies being clear. Too bad for us.
We are gonna keep trying in a few weeks when ISON should be up sooner, hopefully it will get above the morning "muck" so it becomes visible.

Anyone else giving ISON a try now? Its time for the larger scopes to start picking it out under darking skies. New time I'll probably try it with my C14 if the conditions seem favorable. Currently, its touching the eastern horizon right at 3:30am, so another month from now it will be up about 2 hrs sooner and visible in smaller scopes.

Good luck to anyone giving ISON a try. I had lots of fun with PannStarr and Lemmon, now its ISON's time.

...Ralph in Sacramento


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ngchunter
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Re: C/2012 S1 ISON new [Re: aa6ww]
      #6073525 - 09/10/13 04:29 PM

I barely pulled ISON out of the light dome to my east yesterday morning with an Atik Titan and 8" LX200. It would have been a hopeless case visually. I've been watching for it with the camera for a few weeks. Actually as it turns out I started looking the same day Bruce Gary recovered it, but I didn't have any success until last week.

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MessiToM
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Re: C/2012 S1 ISON new [Re: ngchunter]
      #6073569 - 09/10/13 04:53 PM

post a picture! ^

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Wes Stone
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Re: C/2012 S1 ISON new [Re: aa6ww]
      #6073825 - 09/10/13 07:57 PM Attachment (72 downloads)

Quote:

So has anyone seen comet ISON yet?

I went out sat night for an all nighter, with my 180mm APM/TMB F6 refractor and a friend was using his LX-200 12" Meade SCT and we were hoping to get an early morning chance to hunt down Comet ISON but it was just too low for us to find. The Atmosphere that low that early was more than the seeing would allow. We just barely was able to pic out Mars and the Beehave was almost invisible, despite the skies being clear. Too bad for us.
We are gonna keep trying in a few weeks when ISON should be up sooner, hopefully it will get above the morning "muck" so it becomes visible.

Anyone else giving ISON a try now? Its time for the larger scopes to start picking it out under darking skies. New time I'll probably try it with my C14 if the conditions seem favorable. Currently, its touching the eastern horizon right at 3:30am, so another month from now it will be up about 2 hrs sooner and visible in smaller scopes.

Good luck to anyone giving ISON a try. I had lots of fun with PannStarr and Lemmon, now its ISON's time.

...Ralph in Sacramento




I went after ISON this morning from a gray zone site (4500 ft elevation, Limiting Magnitude 7.0 at zenith). There was a little bit of scuzz (residual forest fire smoke) around the horizon, but ISON was well above it by 5am at my latitude of 42.6 degrees. The zodiacal light did brighten the sky a bit.

I starhopped to the field from the Beehive at low power and since there were only a few minutes of astronomical darkness remaining I went right to my 7mm Nagler (165x). I probably should have used 76x instead, but I wanted to darken the background as much as possible and I expected ISON to be small and condensed and possibly in need of higher magnification to be revealed as nonstellar.

The seeing was a bit nervous, but not too bad considering the low elevation (15-20 degrees). My finder chart (printed from Cartes du Ciel) wasn't too precise, so I stumbled around the field a bit. A magnitude 14 field star caught my eye first as looking a bit nebulous (later, back at the computer I saw that it was double, which probably contributed to that effect). After a few minutes, I picked up ISON as a ghostly smudge that was larger than I expected (about 1.5' in diameter). The comet was just a couple of arcminutes WSW of a magnitude 11.5 star.

I followed ISON for about 20 minutes before twilight blotted it out. The comet appeared slightly elongated to the NW (PA 290), pointing toward a field star of magnitude 14.5. The coma seemed just slightly brighter in the middle, with no definite nucleus (the mediocre seeing may have affected my impression).

I didn't make a formal magnitude estimate. I'll try to view the comet again tomorrow morning.

A slightly prettied rough sketch is attached.

--
Wes Stone
Chiloquin, OR


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aa6ww
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Re: C/2012 S1 ISON new [Re: Wes Stone]
      #6074087 - 09/10/13 10:49 PM

Nice report Wes. Its fun when they first start coming into view. I remember being very young and doing this with Halleys comet and have observed ever comet since then that was visible with the gear that Ive owned.
I'm looking forward to some nice visuals. Not a big fan of Photoshopped photos, so the sketches and reports are much more favorable than photos to me.
I'm a big fan of seeing the concert live, not on TV.

Congradulations!!

...Ralph


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MessiToM
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Re: C/2012 S1 ISON new [Re: aa6ww]
      #6074160 - 09/10/13 11:36 PM

Nice! I can't wait

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BSJ
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6074558 - 09/11/13 08:25 AM

http://www.skynews.ca/new-comet-may-become-brilliant-in-2013/

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canukLX90
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Re: C/2012 S1 ISON new [Re: Wes Stone]
      #6075001 - 09/11/13 12:30 PM

Thanks for the report and sketch. Comet is still too low
for me to observe / image at my local where twilight begins
at 5 AM. At 5:30 AM comet is only 21 deg. up. I need about
30 deg elevation to see over the tree tops I might be
able to see it in two weeks time. Keep those reports coming
and thanks.

PJ


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CygnuS
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Re: C/2012 S1 ISON new [Re: Tonk]
      #6075715 - 09/11/13 07:20 PM

Quote:

Ok so Regulus and Mars will be observable but ISON will be drowned out by the others



I didn't mean that I'd be trying to see all three at once with the naked eye. I assume you're NOT saying that ISON will be drowned out when using a telescope to view all 3 at the same time.


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Special Ed
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6076382 - 09/12/13 06:08 AM

Wes,

Great observational sketch and report. I'm like PJ--the view to the east from my observatory is blocked by a ridge to ~20° so I'll have to wait to put my big Cat on ISON. Unfortunately, in a couple of weeks the waning Moon will be a factor. Patience...


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Tonk
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6076385 - 09/12/13 06:13 AM

It was a joke - hence the laughing icon

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John Wunderlin
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Re: C/2012 S1 ISON new [Re: Tonk]
      #6078245 - 09/13/13 05:49 AM Attachment (77 downloads)

Here's a single frame, no calibration, quick stretch taken 2 minutes ago...

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aa6ww
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6078882 - 09/13/13 02:56 PM

Excellent Photo John!!


....Ralph

Quote:

Here's a single frame, no calibration, quick stretch taken 2 minutes ago...




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John Wunderlin
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Re: C/2012 S1 ISON new [Re: aa6ww]
      #6078904 - 09/13/13 03:09 PM Attachment (82 downloads)

Here's my processed stack on the comet. 45x1 minute subs, 10" SCT @f/6.3, ST8300M

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MessiToM
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6079449 - 09/13/13 09:28 PM

BEAUTIFUL!!! ^

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Special Ed
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6079846 - 09/14/13 05:41 AM

I agree--very nice, John. ISON has that "classic" comet look right now.

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MessiToM
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Re: C/2012 S1 ISON new [Re: Special Ed]
      #6080144 - 09/14/13 10:39 AM

I wander if I can reel this in visually with my 17.5" ?

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CygnuS
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6082936 - 09/15/13 10:27 PM

Very nice image John. Thanks for sharing it!

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canukLX90
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6083054 - 09/15/13 11:51 PM

Thanks for posting images John. Great to have a record of
comet changes as it loops by us thru the solar system.

PJ


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aa6ww
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Re: C/2012 S1 ISON new [Re: evilaviator]
      #6083076 - 09/16/13 12:24 AM

That's an excellent site, thanks for the heads up on that. That's all we need to know, as to were to look for it.
I'm looking forward to looking for it now, every Saturday night that I find clear with no moon in the sky when it comes up. I'm not able to get any of my fair weather astronomer friemds to come out with me that early so I'm on my own on this one. Its still pretty fun. These are the best times to find it, when you actually have to be an astronomer and look for it with charts, diagrams and computer programs.
These are the fun times which separates the passionate ones from everyone else.

Again, great site. thanks again!


...Ralph in Sac.

Quote:

I've been keeping an eye on ISON with this website.

http://theskylive.com/ison-tracker




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aa6ww
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Re: C/2012 S1 ISON new [Re: evilaviator]
      #6083175 - 09/16/13 01:59 AM

That site you posted, and:

http://www.calsky.com/cs.cgi

are excellent for locating exactly where ISON is located in the sky, even if one does't have Stellarium or something alone those lines, It seems to be about 2 degs from Mars tonight.

...Ralph in Sac

Quote:

I've been keeping an eye on ISON with this website.

http://theskylive.com/ison-tracker




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John Wunderlin
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Re: C/2012 S1 ISON new [Re: aa6ww]
      #6083866 - 09/16/13 12:35 PM

Thanks everyone! MessiToM, If you've got dark skies, it should be no problem to spot this guy with your big 17" scope, if you don't mind being up at 4am... I'll give this another shot in October.

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MessiToM
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6083969 - 09/16/13 01:34 PM

^ Funny enough the other morning I couldn't drag myself out of bed lol. Iam going to tomorrow morning.


S&T's "straight dope" nothing new but I like the fact they are trying to explain the hype to "non astronomy" folk

http://www.youtube.com/watch?v=jAMN-qHreEI#t=67


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MessiToM
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6085685 - 09/17/13 10:31 AM

I feel like I may have seen it but Iam not confident enough to say I have for sure. What I thought may be ISON looked like a faint fuzzy star that I couldnt get to pinpoint focus.

EDIT* in looking at my charts again in the daylight SkySafari, cometchasing.skyhound.com, and Starry night all match up. What was throwing me off in thinking the skyhound chart was different was that it shows Mars differently. I assume at whatever position mars was on when the chart was made.

Now Iam alot more confident that I saw it because after I thought I did at the eye piece I then looked at another chart and thought I was in the wrong area. When in fact I was in the correct position.

Edited by MessiToM (09/17/13 10:57 AM)


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RenoNV
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Re: C/2012 S1 ISON new [Re: aa6ww]
      #6086109 - 09/17/13 02:15 PM

45 minutes to image, not looking good for Greatness.
Somehow I doubt this is ISON's first rodeo, despite the kinematics.


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aa6ww
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Re: C/2012 S1 ISON new [Re: RenoNV]
      #6086279 - 09/17/13 03:54 PM

Did anyone catch this information about ISON being accompanied by 2 other visible comets come this November.

Looks like lots of fun for us comet lovers!!!

http://astrobob.areavoices.com/tag/2pencke/

...Ralph in Sac


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Dave Mitsky
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6088258 - 09/18/13 03:14 PM

Quote:

I wander if I can reel this in visually with my 17.5" ?




Tony Donnangelo and other observers saw Comet ISON through his 24" Starmaster Dob during the September dark window.

Dave Mitsky


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Jarad
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Re: C/2012 S1 ISON new [Re: aa6ww]
      #6090025 - 09/19/13 01:55 PM

Quote:

Did anyone catch this information about ISON being accompanied by 2 other visible comets come this November.





I noticed this myself when using Cartes du Ciel to try to pick out some good times to observe it. The morning of Nov 24 will have both Encke and Ison within about 6 degrees of each other just before dawn, and both should be reasonably bright. Good opportunity for some wide-field photography.

Jarad


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CygnuS
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Re: C/2012 S1 ISON new [Re: Jarad]
      #6090846 - 09/19/13 11:19 PM

It sure is nice to have a place like this I can check on ISON. I have a 10 inch SkyQuest Dob and a lot of trees to the east of my rural home which means I'm going to have to get up early and haul it in a vehicle to a field a mile away when it becomes bright enough for me to view it. These updates will give me a much better idea of when I should make my first attempt to see it. Thanks everybody.

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hiro
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6092895 - 09/21/13 06:55 AM

It is a clean image of the comet, John.

I got a little late to post another dirty image of the comet here.
C/2012 S1 ISON appeared to be accompanied with surrounding green ion coma.



Data and original are here.
http://www.flickr.com/photos/hiroc/9795767185/

Here is a nice report on the comet. Beautiful images taken with Gemini North 8m scope and an observed magnitude curve are in it.
http://arxiv.org/pdf/1309.2688.pdf


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Rich (RLTYS)Moderator
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Re: C/2012 S1 ISON new [Re: hiro]
      #6092913 - 09/21/13 07:32 AM

Looks good.

Rich (RLTYS)


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CygnuS
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Re: C/2012 S1 ISON new [Re: Rich (RLTYS)]
      #6093614 - 09/21/13 03:10 PM

I'm not sure if this has been posted here or not but a friend sent me this simulation of the comet's path. Of course ISON isn't going to hit the Earth but this shook me up a little bit even though I knew it's nothing to worry about because it's just a matter of the vantage point.
http://stereo-ssc.nascom.nasa.


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6094158 - 09/21/13 09:52 PM

Yeah color- thanks Hiro! I don't have enough sky time yet to make a decent color image- it rises at my tree line and I have about 30-45 minutes only.

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hiro
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6094310 - 09/21/13 11:48 PM

Yes, the comet was still low in the east before the beginning of twilight at the night.
It appeared from behind the woods after moonset in Senjogahara, Nikko.



Data and original are here.
http://www.flickr.com/photos/hiroc/9866508094/

We may be able to enjoy better view next month.


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CygnuS
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Re: C/2012 S1 ISON new [Re: hiro]
      #6101357 - 09/25/13 09:52 PM

I got my Astronomy magazine special edition in the mail today. The first half is mostly comet stuff in general and the second half is ISON. It's 88 pages long. Even if the comet turns out to be a dud I'm going to think positive so I don't feel like I wasted my money. As all you scientists out there know, when something fails it's never a complete failure because you learned something.

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BrooksObs
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6102145 - 09/26/13 11:21 AM

Quote:

I got my Astronomy magazine special edition in the mail today. The first half is mostly comet stuff in general and the second half is ISON. It's 88 pages long.




Might I enquire who is credited as the authors of the material included in the publication?

BrooksObs


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Adam Taylor
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6102636 - 09/26/13 04:28 PM

Quote:

Even if the comet turns out to be a dud...




I follow Seiichi Yoshida's comet prediction site. He updated it a few days ago. It looks like the negative magnitude optimism for comet C/2012 S1 (ISON) is now history, based on observations plotted over time.


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MessiToM
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Re: C/2012 S1 ISON new [Re: Adam Taylor]
      #6103034 - 09/26/13 08:50 PM

Negative Nancy's LOL

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CygnuS
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6103126 - 09/26/13 10:00 PM

Quote:

Quote:

I got my Astronomy magazine special edition in the mail today. The first half is mostly comet stuff in general and the second half is ISON. It's 88 pages long.




Might I enquire who is credited as the authors of the material included in the publication?

BrooksObs



The stories about comets in general were written by Francis Reddy, Richard Talcott, Richard Jakiel and Michael E.Bakich. Phil Harrington did a story on what kind of equipment to view it with and Damian Peach did one on imaging it. Several stories regarding C/2012 S1 specifically were written by Richard Talcott and Michael E. Bakich.
I'm pretty happy with this magazine. Regardless of how bright this thing ends up, the magazine is going to make it fun to follow.


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Dave Mitsky
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6103451 - 09/27/13 02:32 AM

There's an interesting update on Comet ISON at
http://www.skyandtelescope.com/community/skyblog/observingblog/Comet-ISON-Upd...

Dave Mitsky


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Tonk
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Re: C/2012 S1 ISON new [Re: Dave Mitsky]
      #6103501 - 09/27/13 04:07 AM

The reality is comet C2013 R1 (Lovejoy) has better observation prospects! Estimated peak at mag 6 in November well away from the sun in the sky

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hiro
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Re: C/2012 S1 ISON new [Re: Tonk]
      #6103967 - 09/27/13 11:22 AM

I tried imaging of the comet again under moon light September 26, 2013UTC. The comet was already in Leo, and the green halo was present there again.



Data and original are here.
http://www.flickr.com/photos/hiroc/9966413925/


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CygnuS
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Re: C/2012 S1 ISON new [Re: hiro]
      #6104627 - 09/27/13 05:25 PM

Nice job hiro! Thanks for sharing it.
(Could somebody tell me why the word "job" turned orange and was underlined twice after I sent my post?)

Edited by CygnuS (09/27/13 05:28 PM)


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hiro
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6105041 - 09/27/13 10:26 PM

Thanks CygnuS in The Great Rift.

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jshalpha
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Re: C/2012 S1 ISON new [Re: hiro]
      #6106770 - 09/28/13 11:36 PM

Inspired by the images here I resumed my efforts too. Here is my latest from this morning (Sept 28).

http://www.pbase.com/jshuder/image/152610426/large

Jim S.


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hiro
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Re: C/2012 S1 ISON new [Re: jshalpha]
      #6106812 - 09/29/13 12:29 AM

Thanks Jim for the presentation of the clean image.

I have a question. Did you use red continuum (RC) filter or NIR-blocked L filter?


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CygnuS
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Re: C/2012 S1 ISON new [Re: hiro]
      #6107295 - 09/29/13 11:40 AM

Look great Jim!

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jshalpha
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Re: C/2012 S1 ISON new [Re: hiro]
      #6107329 - 09/29/13 11:55 AM

Thanks Hiro. I used a Baader L filter which blocks IR starting at 700nm. I wanted to do a sequence of RGB, but my sky conditions are pretty bad this low to the horizon. I think its a good suggestion to just try the red channel, but the exposures would have to be longer. I shot this at 2350mm fl and ISON is traveling pretty fast. For my setup, ISON is moving about 2.4 pixels per minute (1.4 arc seconds per minute). A trial two minute exposure showed some smearing.
The next time I try this I will use a shorter fl scope since the comet is moving fast and its getter bigger.

Jim S.

Edited by jshalpha (09/29/13 12:05 PM)


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canukLX90
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Re: C/2012 S1 ISON new [Re: jshalpha]
      #6107577 - 09/29/13 01:57 PM

A very nice image of the comet. Thanks for posting for
us fuzz ball chasers to enjoy!

PJ


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Re: C/2012 S1 ISON new [Re: canukLX90]
      #6115176 - 10/03/13 01:21 PM

There is further discouraging news about Comet ISON at http://astronomia.udea.edu.co/cometspage/

Dave Mitsky


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: Dave Mitsky]
      #6115195 - 10/03/13 01:27 PM

Quote:

In view of the evidence presented above there is a 100% probability that comet ISON will disintegrate. The reason is that it exhibits the same SDE+U-shape signature as comets Hönig and Tabur that disintegrated.




Any study that claims to predict something with 100% accuracy is not 100% accurate in my opinion!


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hiro
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6115836 - 10/03/13 06:35 PM

Their analysis is dependent on data gathered by others, brightness reports containing many errors by many persons in the world, and I could not find their accepted reports.

The facts in the history of the comet are as follows:

The length of the dust tail got longer in the past, mere 10 arcseconds in January 31, 2013, and 8 arcminutes in September 30, 2013. Earth distance got about half in the period, and the length got longer by 8x60/10/2 = 24 times in the past eight months. The length got longer very quickly recently, 4 arcminutes in September 16, 2013 and 8 arcminutes in September 31, 2013. The tail got longer by 2 times in the recent two weeks.

Halo was observed first on September 1, 2013 by Juan José González Suárez. I could image the green-tinted halo on September 16, 2013. The halo is another evidence of activity on the surface of the comet, which reached “frost line” in the period.

http://cometografia.es/2013/10/cometas-2013-octubre/

Here is a report by real researchers of astronomy, Karen J Meech and others, which was submitted on August 25, 2013 and accepted on September 9, 2013. This is really nice report containing data gathered with Gemini North 8m scope.

”Outgassing behavior of C/2012 S1 (ISON) from 2011 September to 2013 June”
http://arxiv.org/pdf/1309.2688.pdf

Their last words were as follows.
“While it is unwise to make predictions about the brightness at perihelion when the comet is still far from the sun, especially when it will pass so close to the sun, the run out of these sublimation models show that the comet can still be quite bright at perihelion.”


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CygnuS
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Re: C/2012 S1 ISON new [Re: hiro]
      #6115893 - 10/03/13 07:04 PM

All the uncertainty is fun, educational and exciting. Of course it will be a lot more fun if this thing really does make negative magnitudes.
I've been going through the special edition magazine put out by Astronomy magazine and I really like it.
There are several pages dedicated to October and also January but November and December have night by night break downs of the comet's behavior (and predicted behavior) It will certainly be interesting to see how their magnitude predictions come out.


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PGW Steve
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6116499 - 10/04/13 02:11 AM Attachment (40 downloads)

Here is a shot I took on the 27th.
Field is 17.3x13.1 arc minutes.


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Rich (RLTYS)Moderator
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Re: C/2012 S1 ISON new [Re: PGW Steve]
      #6116604 - 10/04/13 06:20 AM

Looks good.

Rich (RLTYS)


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BrooksObs
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Re: C/2012 S1 ISON new [Re: Rich (RLTYS)]
      #6116793 - 10/04/13 09:12 AM

The recent images of Comet ISON have all been very nice and at first glance impressive, that is until one takes a moment to appreciate their scale.

From a more usual visual standpoint I would hasten to point out that the comet remains a disappointingly small and faint object considering how much closer it has drawn to the Sun over the past couple of months. A more typical comet might be anticipated to be an easy object for at least modest-sized amateur telescopes visually, if not in fact a faint binocular one at this point. However, Comet ISON's coma continues to subtend only a very small dimension in spite of its seemingly impressive photographic tail. At the same time it remains a rather challenging object to see clearly even in fairly large amateur telescopes. Now admittedly the comet's current place in the sky has it in the heart of the morning Zodiacal Light from Earth's vantage point and degrading its visibility, but this does not fully account for how unimpressive ISON appears visually.

On that note I will point out once again that Comet ISON continues to display an intrinsic brightness that is very close to bordering on the survival/non-survival line for comets of very all q at its projected intrinsic brightness. In some ways this seemingly might group it with the presumed behavior of the famous Southern Comets of 1880 and 1887 prior to their perihelia. Hopefully ISON will manage to "hold together" long enough for its nucleus to make it through perihelion and thereby offering the potential for it to develop an impressive tail before dawn in the earliest days of December, but....at this point I would advise observers to keep their fingers and toes crossed!

BrooksObs

Edited by BrooksObs (10/04/13 11:21 AM)


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Tonk
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6117042 - 10/04/13 11:25 AM

Quote:

Of course it will be a lot more fun if this thing really does make negative magnitudes.




But you will not notice this as a) its only potentially this bright for a few hours around perihelion and b) it will be 1/2 to 1 degree from the sun when brightness peaks

The peak is sharp and of short duration

Example of the predicted light curve is here

http://www.aerith.net/comet/catalog/2012S1/2012S1.html


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m00nless
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Re: C/2012 S1 ISON new [Re: Tonk]
      #6117166 - 10/04/13 12:21 PM

Is anyone observing the comet visually yet using a moderate sized telescope?

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Parkit
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Re: C/2012 S1 ISON new [Re: m00nless]
      #6119780 - 10/05/13 10:59 PM

I'm a bit confused. I thought ISON was supposed to be THE big deal starting right around .... now. The last issue of Astronomy magazine I have is from January of 2013 (renewed subscription last week, mostly because of this comet), and after looking closer at it's projected path (pg. 58-59) I can easily see that I'd have to be out at about 5:30am Central time just to TRY to get a glimpse of Comet ISON. It looks from the graphic in Astronomy magazine that the comet's path is through the Spring-Summer sky, and, well, it's not summer anymore. I'm thinking that if we're going to see anything, the best bet is after perihelion? Maybe mid-December?

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CygnuS
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Re: C/2012 S1 ISON new [Re: Parkit]
      #6119842 - 10/05/13 11:58 PM

Great image PGWSteve! Thanks for sharing it.
Parkit, Since your January edition, Astronomy magazine has backtracked a lot. At first they were saying it had a good chance of being the best comet in 400 years but things have changed.
I'm still hoping to get my first view of it on October 15 with my 10 inch SkyQuest Dob. I live in a dark location but have too many trees to the east so I hope I can get some advice from folks here as to whether or not it would be worth it to get up early and load my scope up and move it. I don't want to go to all that trouble if my chances of seeing it are very low.


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canukLX90
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6120331 - 10/06/13 10:20 AM Attachment (30 downloads)

Image taken this morning 5:30 - 6 AM
Azimuth 98 deg. Altitude 29 deg
7 X 3 min @ ISO 800 modded 450D and PowerNewt @ F2.8

A 30 second exposure did show the comet. Comet seems to be
developing nicely and fingers crossed it reaches naked eye
visibility in December/ January time frame.

PJ


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Tonk
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Re: C/2012 S1 ISON new [Re: canukLX90]
      #6120446 - 10/06/13 11:36 AM

Quote:

The last issue of Astronomy magazine I have is from January of 2013 (renewed subscription last week, mostly because of this comet),




Which I suspect is precisly what they wanted to achieve.

There is usually no chance a prediction made 11 months before perihelion with a new first time visiting comet has any chance of having any accuracy. A good journalist would know this by doing the required research and looking at the success of historial long term predictions (Kohoutec anyone?) and not blithly following the initial hype that was thrown up only days after this comet was discovered.

Hence the backtracking after the comet has been observed over a much large portion of its orbit and its dynamic behaviour better understood.

At the time we were told it could be as bright as the moon without qualifying that this would be very brief (a few hours only) and very very close to the sun in the daytime sky

Quote:

I don't want to go to all that trouble if my chances of seeing it are very low.




Factor in that it currently is around mag 11 but brightening every day


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Parkit
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Re: C/2012 S1 ISON new [Re: Tonk]
      #6120467 - 10/06/13 11:50 AM

Thanks for the replies, I figured that the early hype was exactly that. I'll wait a bit before I start looking for it in the 14" dob.

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kfiscus
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Re: C/2012 S1 ISON new [Re: Parkit]
      #6120980 - 10/06/13 05:14 PM

Found it easily on Oct.2 in my Z12. Looked like a slightly oval planetary nebula, both in terms of color and fuzziness. I couldn't pick up the tail, my observing buddy thought he got a glimpse of it. We've been cloudy ever since.

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Tonk
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Re: C/2012 S1 ISON new [Re: kfiscus]
      #6121729 - 10/07/13 04:49 AM

Quote:

I'll wait a bit before I start looking for it in the 14" dob




I would have thought a 14" would master a 11 mag object! However ISON is currently in the zodiacal light band which doesn't help


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hiro
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Re: C/2012 S1 ISON new [Re: Tonk]
      #6122091 - 10/07/13 10:37 AM

Hi again,

I could take new frames of the comet on October 5, 2013. It was in zodiacal light.



Data and original are here as usual.
http://www.flickr.com/photos/hiroc/10131796815/



Data and original are here.
http://www.flickr.com/photos/hiroc/10132557786

The comet looked still dark and small, thought it got activated much.

Thank you for looking.


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Dave M
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Re: C/2012 S1 ISON new [Re: hiro]
      #6125959 - 10/08/13 10:08 PM

Nice shots Hiro..

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MessiToM
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Re: C/2012 S1 ISON new [Re: hiro]
      #6125963 - 10/08/13 10:10 PM

Another nice photo ^

I have been either cloud or fog plagued for a week or two. I will wake up AGAIN at 5am to check for a clear low horizon.


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Mike B.
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6126065 - 10/08/13 11:05 PM

Here's my first go at it:


Comet ISON, 2013-10-07. 24x120 sec @ ISO 800, TV-85 at F/5.6, IDAS-LPS, Canon T3 mod.

Even though I'm shooting through lots of bad LP and I had to cut a tree down to get the shot, ISON is doing well enough to produce a decent image even under those conditions.

Edited by Mike B. (10/09/13 10:28 AM)


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dyslexic nam
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6126080 - 10/08/13 11:14 PM

^^^ very nice pic.

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MessiToM
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Re: C/2012 S1 ISON new [Re: dyslexic nam]
      #6126204 - 10/09/13 12:38 AM

Cut a tree down for the shot! Lol that's great. Good pic!

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Tonk
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6126382 - 10/09/13 05:50 AM

Quote:

Even though I'm shooting through lots of bad LP and I had to cut a tree down to get the shot, ISON is doing well enough to produce a decent image even under those conditions.




Darn, I have to cut out 20 trees (not mine) and dig out a whole hillside and reroute a road. I won't get a photographic look in until post perihelion


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SporQ
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Re: C/2012 S1 ISON new [Re: Tonk]
      #6126606 - 10/09/13 09:30 AM

Cutting down trees just allows more LP in.

What magnification is the above photo? (This really should have been included. If a photo is worth posting, it deserves a caption).


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blb
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Re: C/2012 S1 ISON new [Re: SporQ]
      #6126630 - 10/09/13 09:46 AM

Quote:

What magnification is the above photo? (This really should have been included. If a photo is worth posting, it deserves a caption).



Wow! Here is the caption he provided.

Quote:

Comet ISON, 2013-10-07. 24x120 sec @ ISO 800, TV-85 at F/5/6, IDAS-LPS, Canon T3 mod.




All that needed to be included is included in it. I have never seen the magnification posted with any picture in a magazine or book. In fact he gives more information than most published photos.


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: SporQ]
      #6126754 - 10/09/13 10:57 AM

Quote:

Cutting down trees just allows more LP in.




And also allows you to image an object that you otherwise couldn't image. I'd do the same, but my problem tree is in my neighbor's yard- they may say something if I cut down their tree.


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brianb11213
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6126807 - 10/09/13 11:28 AM

Quote:

my problem tree is in my neighbor's yard- they may say something if I cut down their tree.



Build an observing tower?


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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6126808 - 10/09/13 11:28 AM

I was finally able to grab ISON this past Sunday morning. using my 16" dob it resembled a faint nebula. I was also able to try the Lumicon Comet filter I bought a couple months ago. Turns out it actually worked! It brought out more of the comet's coma. I need to try getting an image of it now.

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Re: C/2012 S1 ISON new [Re: Tonk]
      #6126990 - 10/09/13 01:21 PM

Quote:

Quote:

Even though I'm shooting through lots of bad LP and I had to cut a tree down to get the shot, ISON is doing well enough to produce a decent image even under those conditions.




Darn, I have to cut out 20 trees (not mine) and dig out a whole hillside and reroute a road. I won't get a photographic look in until post perihelion




Twenty trees? Gosh! Sorry to hear about your neighbors' trees (and the other stuff) blocking your view to Comet ISON, Tonk.

Luckily, my tree was small and it was not doing much for me as far as LP blocking or shade. A very sharp hand saw took care of the problem in short order.

However, to get a really good look and better imaging data for Comet ISON, I'll have to travel to a dark sky location, it seems. I'm too limited here at home.


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CygnuS
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6127090 - 10/09/13 02:03 PM

Great image MikeB. Thanks for posting it and thanks for risking life and limb (tree limb that is) to get it.

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Savio Fong
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6127798 - 10/09/13 08:15 PM Attachment (21 downloads)

taken from my robotic observatory in Tibet, 4300m altitude. The comet is within 2 degree from Mars.

stack of 15x180s

APM 105/650 APO
FLI Proline 16803 Camera
Paramount ME

33% crop


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Savio Fong
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6127800 - 10/09/13 08:15 PM Attachment (18 downloads)

and this is the 100% crop, the original field is more than 3x3 degree with my current setup.

I found the comet is moving quite fast, with 2.8"/pixel resolution, single frame of 180s exposure already show slight elongation of the nuclear.

Edited by Savio Fong (10/09/13 08:18 PM)


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MessiToM
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6127803 - 10/09/13 08:19 PM

Good work ^

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Savio Fong
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6128250 - 10/10/13 01:11 AM Attachment (43 downloads)

Thank!

see color version made 6hrs ago this morning. Same setup above, RGB filter. Taken from my robotic observatory in Tibet,

5x120s per channel

Higher resolution version


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Savio Fong
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6128251 - 10/10/13 01:12 AM Attachment (33 downloads)

see 100% crop here,

Edited by Savio Fong (10/10/13 01:14 AM)


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CygnuS
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6128434 - 10/10/13 06:58 AM

I sure enjoy all these ISON images. They're the first thing I check out whenever I log in. Thanks for posting them. I'm only a visual observer so I sure appreciate them.

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John Wunderlin
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6128454 - 10/10/13 07:22 AM

Great shots Savio! I just got some more data myself. I also saw it visually for the first time in my 10" scope this morning. Just a faint ghost right now. Couldn't see the nucleus and maybe just a hint of elongation. Very, very faint visually.

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Savio Fong
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6128685 - 10/10/13 09:59 AM

Quote:

Great shots Savio! I just got some more data myself. I also saw it visually for the first time in my 10" scope this morning. Just a faint ghost right now. Couldn't see the nucleus and maybe just a hint of elongation. Very, very faint visually.




Thanks John for your nice comment. Actually I have a 16" Dob in my observatory in Tibet, at such altitude and with such sky quality in Tibet, the view will be great if I am there. But I am not sure whether I will go that time, depending how it goes on.


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Rich (RLTYS)Moderator
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6128976 - 10/10/13 12:23 PM Attachment (46 downloads)

On the morning of Oct 8, I finally was able to image Comet Ison with the Slooh Remote Observatories T1 telescope.

Rich (RLTYS)


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TechPan6415
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Re: C/2012 S1 ISON new [Re: Rich (RLTYS)]
      #6129293 - 10/10/13 03:02 PM

I look forward to it getting bigger and brighter, then I can take a real photograph of it with something Earthbound like the shot of Hale-Bopp in my avatar, I made $,$$$ off of that shot.

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Tonk
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Re: C/2012 S1 ISON new [Re: TechPan6415]
      #6129405 - 10/10/13 04:10 PM

Quote:

Sorry to hear about your neighbors' trees




I can't blame any neighbour - its a wild wood on a hill that is just in the way. My observatory is at the bottom of the hill!

Quote:

What magnification is the above photo? (This really should have been included. If a photo is worth posting, it deserves a caption).




Magnification here is totally meaningless. You could ask for the field of view (quoted in degrees) as that has meaning for prime focus photography


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Savio Fong
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Re: C/2012 S1 ISON new [Re: Rich (RLTYS)]
      #6130161 - 10/10/13 11:27 PM

Quote:

On the morning of Oct 8, I finally was able to image Comet Ison with the Slooh Remote Observatories T1 telescope.

Rich (RLTYS)




very nice shot!


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hiro
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6130299 - 10/11/13 01:19 AM

Hi all,

I tried imaging of the comet with autoguiding at the center of condensation of the coma October 9, 2013UTC.
Exposure length was expanded up to 15 minutes with no trace of trailing of the rapidly drifting comet.



Data and original are here.
http://www.flickr.com/photos/hiroc/10190898716/

Screen shot of a frame of PHD guiding while guiding and the corresponding area on planetarium software in the lower half.



Data and original are here.
http://www.flickr.com/photos/hiroc/10190850625/


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6130300 - 10/11/13 01:19 AM Attachment (38 downloads)

Here's my data from this morning. 57x60 seconds.

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kcolter
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6130536 - 10/11/13 08:24 AM

I also saw it visually for the first time in my 10" scope this morning. Just a faint ghost right now. Couldn't see the nucleus and maybe just a hint of elongation. Very, very faint visually.




Strong work, John, on the visual observation. I have tried three mornings now and cannot see it with an 11 inch Starmaster. Your observation gives me the incentive to keep trying. I own larger aperture but haven't been able to try the larger scopes on the comet yet.


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: kcolter]
      #6130867 - 10/11/13 11:41 AM

Quote:

Strong work, John, on the visual observation.




Thanks! The only way I was able to find it visually was by going back and forth between my observatory and my dob doing careful star hopping, comparing the star patterns from my DSLR and my eyepiece view. This is definitely the faintest comet I've ever observed through my Dob. Not much to see just yet.


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canukLX90
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6131188 - 10/11/13 01:43 PM

Great images and observations. Thanks to all for posting.
I didn't have to bring out the chainsaw to take my first
image of the comet but it was touch and go at 28 degrees
elevation

PJ


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kcolter
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6134551 - 10/13/13 09:22 AM

I looked more closely at the finder chart before rolling my 20 inch out to a spot with better eastern horizon and was able to see Ison this morning. Dim even in the 20 inch. It will be a pleasant surprise if this comet blossoms significantly next month.

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CygnuS
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Re: C/2012 S1 ISON new [Re: kcolter]
      #6134828 - 10/13/13 11:42 AM

kcolter, You mentioned that it is dim in your 10 inch and 20 inch. Your 10 inch report was encouraging but obviousely not so with the 20. I'm going to get my SkyQuest 10 inch Dob out now that it aligning with Mars and Regulus and should be easier to find. What was your magnification and sky conditions when you last saw it with the 10?

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Savio Fong
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6135712 - 10/13/13 07:45 PM

taken yesterday morning my local time. The comet is definitely brigther than 10th magnitude, may be brighter than 9th. And the tail is over 16min long.

Exposure is 20x120s, the image is stacked against the comet nuclear, so the limiting magnitude of a 4" refractor in 120s exposure in my site is ~19th magnitude, and that part of sky is affected by zodaic light, and Mars is in the same CCD field at the moment, hence not the perfect condition.

Image

b/w inverted image

Magnitude comparison

web page

Edited by Savio Fong (10/13/13 07:54 PM)


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Dean Norris
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6135745 - 10/13/13 08:08 PM

I observed Comet ISON this morning (10/13/12) through my 10" f/6 newt. The sky was dark and transparency was decent I was able to view NGC 2024 the Flame Nebulae with direct vision, right before finding the comet. The seeing was marginal leaning towards poor since Jupiter was showing some detail but very fuzzy. I found the comet using a 14mm 100* ep at 110x magnification. It was not easy to find. Around 5:15am local time ( 13:15 UT) after 20 minutes of looking I saw a dim object which for me resembled a flat amorphous galaxy. No nucleus or coma was seen on the comet. It was between 2 stars which I estimated at 10.5 and 10th magnitude. The comet was seen with direct vision but averted vision helped some. The comet was closer to the 10.5 star. I also observed it at 171x but the 110x view was best. I observed the comet for a half hour and stopped when I noticed the sky lightening.

Last week I tried to find it with no avail. So I'm assuming that it's brighten some in a week.

Good seeing and clear skies everyone. May this comet be one that we will long remember.

Dean


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canukLX90
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6136266 - 10/14/13 03:31 AM Attachment (15 downloads)

Great images. Thanks for posting.
Comet is not visible until twilight starts at my location.
Difficult to get a good image in morning twilight as tail
in my image is only about 5 arc minutes.

PJ


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Savio Fong
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Re: C/2012 S1 ISON new [Re: canukLX90]
      #6136371 - 10/14/13 07:19 AM

My animation, ~10Mb

http://www.astro.hk/C2012_S1_2013-10-13_UT_2139-2304.gif


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kcolter
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6136437 - 10/14/13 08:43 AM

Quote:

kcolter, You mentioned that it is dim in your 10 inch and 20 inch. Your 10 inch report was encouraging but obviousely not so with the 20. I'm going to get my SkyQuest 10 inch Dob out now that it aligning with Mars and Regulus and should be easier to find. What was your magnification and sky conditions when you last saw it with the 10?



Sorry about the confusion. John saw it in his ten inch, I quoted his note and mentioned that I failed three times with my 11 inch. When I saw it in the 20 inch it was quite clear and transparent. I was at my home where the sky is NELM 5.5 or so, not real dark. I had a note from a friend today who lives west of me where it is darker (NELM 6.0 or so), he was unable to see it in a 10inch yesterday. He did get a nice image of it.


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dyslexic nam
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6137777 - 10/14/13 08:15 PM

Quote:

My animation, ~10Mb

http://www.astro.hk/C2012_S1_2013-10-13_UT_2139-2304.gif




That is excellent - thanks a lot for posting.


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CygnuS
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Re: C/2012 S1 ISON new [Re: dyslexic nam]
      #6138432 - 10/15/13 07:25 AM

I made my first effort to see it with my 10 inch Dob and was unsuccessful. The star chart on page 47 of Astronomy magazine's special edition was very helpful.
Perhaps I shouldn't say I didn't see it. I did make a sketch of a spot where I thought I saw a smudge when jiggling the scope. (averted vision didn't seem to help) Does anybody know which website is best to compare it's location with stars of mag 9-11?


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Tapio
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6138528 - 10/15/13 08:36 AM

Should be visible in 10" scope.
Here's finder chart:
http://www.heavens-above.com/comet.aspx?cid=C%2F2012%20S1&lat=0&lng=0...


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BrooksObs
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Re: C/2012 S1 ISON new [Re: Tapio]
      #6138629 - 10/15/13 09:36 AM

Let me point out that for folks who are not regular observers of comets, C/ISON is a decidedly difficult object visually at this time save for those employing really large scopes, or perhaps having access to an observing site with very dark skies. So don't feel bad if you are not seeing it yet.

I would also note that after tomorrow morning ISON will become visually pretty much out of range for just about everyone, regardless of telescope size, for the next 10-12 days as the moon takes over the morning sky. It currently looks like that only during the comet's final fortnight, or so, leading up to perihelion might it become easily seen with binoculars and modest-sized telescopes. You can pretty much forget any hopes of spotting it with the naked eye.

BrooksObs

Edited by BrooksObs (10/15/13 11:42 AM)


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blb
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6138737 - 10/15/13 10:30 AM

Quote:

...Does anybody know which website is best to compare it's location with stars of mag 9-11?



Try this site http://cometchasing.skyhound.com/


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6138765 - 10/15/13 10:51 AM

Quote:

Perhaps I shouldn't say I didn't see it. I did make a sketch of a spot where I thought I saw a smudge when jiggling the scope.




I think you found it. That's about what I saw- just a smudge. If you're not a regular faint galaxy or comet hunter, you'd probably not see this in a 10" scope yet.


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MessiToM
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6139227 - 10/15/13 02:47 PM

I have been cloud locked for weeks unfortunately. You know as soon as the moon is back in the dawn sky it will be crystal clear.

Never fails


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Savio Fong
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Re: C/2012 S1 ISON new [Re: MessiToM]
      #6139729 - 10/15/13 08:10 PM

Quote:

I have been cloud locked for weeks unfortunately. You know as soon as the moon is back in the dawn sky it will be crystal clear.

Never fails




yes, that's the same in the other part of the world also, a hurricane attack India so my observatory site in Tibet got raining for 2 days also, which I usually enjoy 90% clear sky rate in this season.


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Mike B.
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6140182 - 10/16/13 01:28 AM

My latest image of the comet:


Comet ISON on October 15, 2013, 10:30 UT. 30x120 sec @ ISO 800, TV-85 at F/5.6, modified Canon T3.

I had binos this morning but struck out on seeing all three comets that are presently in the morning skies. Hopefully, that will change soon.


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Tapio
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6140241 - 10/16/13 02:59 AM

Mike, that is nice.
You did two stacks (star align & comet align) and blend them together ?


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canukLX90
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6140248 - 10/16/13 03:26 AM

Very nice image Mike. Looks like you can get subs before
the morning twilight starts. Keep them coming...there is
some discussion that it may break up.

PJ


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Mike B.
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Re: C/2012 S1 ISON new [Re: Tapio]
      #6140321 - 10/16/13 06:11 AM

Quote:

Mike, that is nice.
You did two stacks (star align & comet align) and blend them together ?




Thanks!

Yes, exactly. It is two stacks blended. So, it is really a composite image.


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Mike B.
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Re: C/2012 S1 ISON new [Re: canukLX90]
      #6140328 - 10/16/13 06:26 AM

Quote:

Very nice image Mike. Looks like you can get subs before
the morning twilight starts. Keep them coming...there is
some discussion that it may break up.





Thanks, PJ.

I'm shooting more sub-images as I type this. Unfortunately, clouds came in after only 11 shots, so the results might be meager compared to yesterday's.


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CygnuS
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6141178 - 10/16/13 03:39 PM

Great image Mike. Thanks for sharing it. It's the best yet.
You're a knight who does things right.
(that's the motto of the kids cartoon "Mike the Knight")


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CygnuS
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6141971 - 10/16/13 10:27 PM

Hey, I just had a thought. If ISON breaks up and never even gets bright enough to be seen in 8 inch scopes will my special edition of Astronomy magazine become a collectors item just like the newspapers that printed Dewey winning the US presidency? I suspect that 90% of them will be thrown out in disgust and the survivors will be rare as oddities.
I'm not exactly going to plan my retirement on the value of this potential collectors item. Besides, I'm still rooting for the comet to live up to the hype started nearly a year ago. Increasingly it doesn't look like that's going to happen.


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Savio Fong
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6142769 - 10/17/13 11:49 AM

Stack of images this morning,

http://www.astrocafe.hk/viewtopic.php?f=16&t=3321&p=23811#p23811

UT 2013-10-16 (21:32 - 23:07)
Exposure 25x120s

Animation of 25 frames here, 14Mb file :
http://www.astro.hk/C2012_S1_Mars_Regulus_L-120S_20131016_UT_2132-2307.gif

the tail is now ~18 arc-minutes long, grow from 16 arc-minutes just 4 days ago.

Taken from my robotics observatory in Tibet.


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Savio Fong
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6142774 - 10/17/13 11:51 AM

and the comet should be about 9th magnitude? See this picture taken this morning, single shot of the above, with the interference from full moon, zodiac light and occasional thin cloud,

http://www.astrocafe.hk/download/file.php?id=9263


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Savio Fong
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6144084 - 10/18/13 01:04 AM

Comet, Mars, Regulus & Zodical Light, taken this morning, from my robotic observatory in Tibet, just 4x120s exposure. Animation of 25 frames will be done shortly afterwards.

http://www.astrocafe.hk/download/file.php?id=9268


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Savio Fong
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Re: C/2012 S1 ISON new [Re: Savio Fong]
      #6144209 - 10/18/13 03:23 AM

My best animation of C2012 S1 as of today, taken from my robotic observatory in Tibet this norming. Universal Time 2013-10-17, 21:18-22:51

~17Mb, click and wait till download finished,
http://www.astro.hk/C2012_S1_Mars_Regulus_L-120S-20131017-UT2118-2251.gif

stack of 25x120s as follows,
http://www.astrocafe.hk/download/file.php?id=9269


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BrooksObs
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Reged: 12/08/12

Re: C/2012 S1 ISON new [Re: CygnuS]
      #6144396 - 10/18/13 08:37 AM

Quote:

Hey, I just had a thought. If ISON breaks up and never even gets bright enough to be seen in 8 inch scopes will my special edition of Astronomy magazine become a collectors item just like the newspapers that printed Dewey winning the US presidency? I suspect that 90% of them will be thrown out in disgust and the survivors will be rare as oddities.
I'm not exactly going to plan my retirement on the value of this potential collectors item. Besides, I'm still rooting for the comet to live up to the hype started nearly a year ago. Increasingly it doesn't look like that's going to happen.




Not very likely. There is a wealth of Comet Kohoutek material always to be found on eBay that sells for minimal price. Thus, I wouldn't anticipate any different situation with Comet ISON. Likely the best place to ultimately store your copy of Astronomy Magazine's special Comet ISON issue will be in the well know "circular file" for weekly disposal!

BrooksObs


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BrooksObs
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6144477 - 10/18/13 09:23 AM

While I would be the first to admit that the many images, particularly the color ones, we are seeing posted on the Internet are impressive, for the most part they do not convey two rather obvious potential problems with C/ISON.

On images C/ISON looks big and health, but what is mostly missing from the images is a scale indicating image size. The nice, bright, seeming "head" of C/ISON on images is little more than a mere 1' in size. For a comet currently just 1.3AU from the Sun this is unusually small. Visual observers are mostly reporting a faint and diffuse outer coma up to 4' in size, but this is very weak.

At the same time, most any significant comet will show indications of streamers in the tail by the time it has closed to within 1.3 AU. C/ISON's tail exhibits absolutely no streamer features, generally indicative of very low outgasing.

Both of these situation tend to be commonly seen in regard to small periodic comets, not major objects. Thus, I'm concerned just what this has to say about C/ISON. I remember that at a recent C/ISON conference a prominent professional astronomer in the comet field called ISON gas starved and, "a flying dust-ball". I only hope that he may be wrong for observers' sake.

BrooksObs


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canukLX90
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6144949 - 10/18/13 01:52 PM

Your image scale comment noted. I will include scale info
on future image posts along with the equipment and
processing steps.

PJ


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CygnuS
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6145239 - 10/18/13 04:54 PM



Not very likely. There is a wealth of Comet Kohoutek material always to be found on eBay that sells for minimal price. Thus, I wouldn't anticipate any different situation with Comet ISON. Likely the best place to ultimately store your copy of Astronomy Magazine's special Comet ISON issue will be in the well know "circular file" for weekly disposal!

BrooksObs



I hope everybody listens to your wise advice and throws theirs away. That way I'll have the only one left and I WILL be able to retire when selling it. Seriously though, I'm just going to add it to my collection and laugh at it in 20 years then die and make my kids throw it out.


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Mike B.
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6145561 - 10/18/13 08:33 PM

Quote:


On images C/ISON looks big and health, but what is mostly missing from the images is a scale indicating image size. The nice, bright, seeming "head" of C/ISON on images is little more than a mere 1' in size. For a comet currently just 1.3AU from the Sun this is unusually small. Visual observers are mostly reporting a faint and diffuse outer coma up to 4' in size, but this is very weak.




Yes, I agree. Gauging the size is hard for a little comet like ISON. Here's what I usually do for my comet images:



I looked up the distance between two stars in the image with Cartes du Ceil and created the scale bar based on that. So, it might be off +/- 20 seconds.


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Tonk
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6146072 - 10/19/13 05:10 AM

Mike - you could also post the image to AstroBin (free) or any other online astrometric service and the image is plate solved and dimensions returned to you (or appended to the gallery notes for the image when building your gallery on AstroBin - example here http://www.astrobin.com/33885/ )

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Mike B.
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Re: C/2012 S1 ISON new [Re: Tonk]
      #6146995 - 10/19/13 04:28 PM

Quote:

Mike - you could also post the image to AstroBin (free) or any other online astrometric service and the image is plate solved and dimensions returned to you (or appended to the gallery notes for the image when building your gallery on AstroBin - example here http://www.astrobin.com/33885/ )




Doh! Yes, you are right. I had already posted it and plate solved it at Astrobin. I could have easily calculated the width in pixels with the data:

RA center: 10:09:51.065
DEC center: +13:57:27.029
Pixel scale: 2.24 arcsec/pixel
Orientation: -178.02 degrees
Field width: 52.31 arcminutes
Field height: 35.15 arcminutes

Live and learn, as they say. heheh

Edit: Got it: 268.4 pixels! My bar is a teeny, tiny hair shy of 268. lol

Edited by Mike B. (10/20/13 12:33 PM)


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BSJ
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6149356 - 10/21/13 07:36 AM

"This disintegration will take place before it reaches perihelion,"

http://www.spacedaily.com/reports/Is_the_Christmas_Comet_cracking_up_999.html


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BrooksObs
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Re: C/2012 S1 ISON new [Re: BSJ]
      #6149507 - 10/21/13 09:36 AM

Quote:

"This disintegration will take place before it reaches perihelion,"

http://www.spacedaily.com/reports/Is_the_Christmas_Comet_cracking_up_999.html




Sadly, just a rehash of misinformation put forth by "staff writers" and one supposed South American "astronomer" with a highly questionable reputation for making predictions that don't pan out.

BrooksObs


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TxStars
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6149658 - 10/21/13 11:11 AM

Perhaps we could still win the comet loto and get a fantastic naked eye view.

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Rocky68d
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Re: C/2012 S1 ISON new [Re: TxStars]
      #6150080 - 10/21/13 03:37 PM

This is indeed a rehash. I found an article from February of this year with these same quotes from Ferrin.

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Scanning4Comets
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Re: C/2012 S1 ISON new [Re: Rocky68d]
      #6154810 - 10/24/13 04:27 AM

Great pic Mike!

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Mike B.
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Re: C/2012 S1 ISON new [Re: Scanning4Comets]
      #6158125 - 10/25/13 08:11 PM

Quote:

Great pic Mike!




Thanks, Markus!

Here's one I think everyone will appreciate - a comparison of Comet ISON taken this morning (Oct 25th, 2013) and the image I took 10 days ago on Oct 15th:



I used the exact same equipment and image crop pixel dimensions, so it is a pretty good comparison. What do y'all think? Doubled in size or so?

I was pretty impressed at how much it has grown in the short time since I last devoted a morning to it. Even with a bright moon nearby, it still had considerable signal and it did not get washed-out by moonlight like I thought it might.

Edit: A link to the "final" Oct 25th version is here.

Edited by Mike B. (10/26/13 09:20 AM)


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CygnuS
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6158383 - 10/25/13 10:54 PM

Fantastic Mike!
Thanks so much for sharing these. Great work!


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Rich (RLTYS)Moderator
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6158687 - 10/26/13 07:00 AM

Has anyone noticed the ISON's tail has a reddish hue?

Rich (RLTYS)


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BrooksObs
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Re: C/2012 S1 ISON new [Re: Rich (RLTYS)]
      #6158782 - 10/26/13 09:14 AM

Quote:

Has anyone noticed the ISON's tail has a reddish hue?

Rich (RLTYS)




Of course. It's a dust tail.

BrooksObs


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Tonk
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6158918 - 10/26/13 10:48 AM

Quote:

Of course. It's a dust tail.




Indeed - Comet Garradd (from a couple years back) also had a noticeable orange-red tint to its tail


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canukLX90
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6159227 - 10/26/13 01:53 PM

Thanks for posting...great images and I do like the
comparison showing how this comet is developing.

PJ


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urassner
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Re: C/2012 S1 ISON new [Re: canukLX90]
      #6160699 - 10/27/13 12:46 PM Attachment (52 downloads)

First attempt at Ison from the City with a DSLR (did not have a remote release, hence the artifact on the brighter star). Animated gif from 13 15 seconds exposures over 9 minutes. Taken through a TV Genesis SDF. It is amazing to me how fast it moves. Had to compress it quite a bit to get it to 200 kb.

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Mike B.
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Re: C/2012 S1 ISON new [Re: canukLX90]
      #6163679 - 10/28/13 11:33 PM

Quote:

Thanks for posting...great images and I do like the
comparison showing how this comet is developing.





You are most welcome. I love seeing this comet progress and I imaged it everyday since last Thursday until Sunday morning, when weather conditions changed for the worse and put a stop to my efforts.

Sunday's data was only so-so, since the murk was extra thick that day and the moon didn't help matters. It was too noisy to use to make a close-up image. I made the best of the situation by taking the data and making another comparison image, this time with the moon. Check it out:



The moon was taken with the same equipment and is actually a first quarter moon flipped to match the phase of the moon that was out Sunday morning. LoL.

This is the full frame of my imaging rig. I'm hoping that before its all over, ISON won't fit inside the frame because it will get too big! Now that would be awesome. lol


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John Wunderlin
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6164811 - 10/29/13 03:28 PM

Nice one Mike- I think you captured a couple of meteor impacts on the moon as well

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Mike B.
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6165344 - 10/29/13 09:01 PM

Quote:

Nice one Mike- I think you captured a couple of meteor impacts on the moon as well




LoL. Yeah, its a meteor storm from ISON. (Cue the woo-woo music.)


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CygnuS
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6165532 - 10/29/13 11:43 PM

Well Mike, when you "make the best of the situation" you sure know what you're doing. It has an awesome 3D look to it. Thanks!

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CygnuS
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6170629 - 11/01/13 04:44 PM

I'm pretty happy to see the Moon fading away. I haven't made an attempt to see the comet since my failed attempt on Oct 15 and I'm excited to try again. Does anybody know what the magnitude increase has been since then?

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BrooksObs
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6170661 - 11/01/13 04:59 PM

Quote:

I'm pretty happy to see the Moon fading away. I haven't made an attempt to see the comet since my failed attempt on Oct 15 and I'm excited to try again. Does anybody know what the magnitude increase has been since then?




Very little I'm afraid, and mostly due to the comet's decreasing geocentric distance. ISON was reported as a little fainter than 10.0 at mid month and the latest reliable sightings put it in the mid 9's.

BrooksObs


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CygnuS
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6171000 - 11/01/13 08:09 PM

Thanks for the warning Brooks. I suppose it's still worth a try. A half-mag increase might be all I need to pick it up with my 10 inch.

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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6171667 - 11/02/13 10:09 AM

Mike B, That is a stunning shot!

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canukLX90
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Re: C/2012 S1 ISON new [Re: MawkHawk]
      #6172389 - 11/02/13 06:33 PM Attachment (35 downloads)

Image taken on the morning of 28 October. The moon did not
seem to be too much of an issue and the later morning
twilight sure helped in getting more subs as I have to wait
for the comet to climb above 28 deg altitude to clear the
tree tops.

PJ


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Mike B.
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Re: C/2012 S1 ISON new [Re: canukLX90]
      #6173063 - 11/03/13 02:32 AM

I shot it on the morning of Nov 2nd, 2013. ISON was rising out the trees and I started shooting it with great expectations that I'd get lots of good data.

Unfortunately, clouds invaded and I had to throw out more than half of what I shot. What was left was lots of LP ridden images and quite a few subs with tree branches in them, since the early subs caught it rising out the trees before the clouds came.

Anyway, you can get the basic idea of how it looked:



ISON seems to be getting bigger but I don't think it is getting any brighter. In fact, since the light is spread out more, it could be even dimming down somewhat.


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Rocky68d
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6174607 - 11/03/13 10:26 PM

Mike,
You have provided better updates on ISON with your photos than I've seen anywhere else, so thanks for that. My question to those who understand comets better than I do, which is just about everyone here, is if ISON is going to live up to earlier predictions, when will we see it? Before perihelion, post perihelion? Thanks.


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Re: C/2012 S1 ISON new [Re: Rocky68d]
      #6174726 - 11/04/13 12:10 AM

There's a nice guide in the current Sky and Telescope issue. Basically, it's a morning object until late December. It will get brighter as it nears the sun, but it will be harder to see in the glare. If it breaks up before perihelion, there may not be much left to see. If it breaks up after, it could put on quite a show. It's anyone's guess right now (and a lot of people are trying to guess )

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canukLX90
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Re: C/2012 S1 ISON new [Re: John Wunderlin]
      #6174783 - 11/04/13 02:00 AM Attachment (40 downloads)

Great images to date Mike. For interest I did a crop /
resize / lowpass filter / tangent histogram stretch on
both C/2012 S1 and C/2013 R1 nucleus. Interesting to see
how tight and basically round the nucleus of C/2012 S1 is
versus a very convoluted shape for the nucleus of C/2013 R1.
I don't know how this relates to comet activity but
C/2013 R1 certainly is putting on a better show right now
than C/2012 S1.

PJ


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Re: C/2012 S1 ISON new [Re: canukLX90]
      #6174923 - 11/04/13 06:47 AM

ISON this morning was bright and easy to see in my 10" under mediocre sky conditions. I would estimate the brightness is at least mag 8.0. Slightly oblong coma about 2' in size, but no tail seen due to brightening dawn sky and high clouds.

JimC


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Re: C/2012 S1 ISON new [Re: Mirzam]
      #6177997 - 11/05/13 06:50 PM

If it hadn't been hyped, would be be so concerned with it? Observations I made yesterday morning made it hard to believe it could possibly become a great comet - but I know it'll be getting warm in three weeks, so I am keeping my fingers crossed! Glen

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PowellAstro
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Re: C/2012 S1 ISON new [Re: Glen A W]
      #6178059 - 11/05/13 07:30 PM

Does anyone have or know the data needed to key ISONs data into an Autostar hand controller?

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Mike B.
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Re: C/2012 S1 ISON new [Re: Rocky68d]
      #6178130 - 11/05/13 08:22 PM

Quote:

Mike,
You have provided better updates on ISON with your photos than I've seen anywhere else, so thanks for that. My question to those who understand comets better than I do, which is just about everyone here, is if ISON is going to live up to earlier predictions, when will we see it? Before perihelion, post perihelion? Thanks.




Thanks, Rocky. Getting comet images is what I live for. lol Glad my obsession helps out other people, too.

I don't make predictions, but I say any comet with a tail is a good comet. Now, if it holds together and performs like McNaught or Lovejoy did with a tail so long it won't fit in some of my wide angle lenses, that will make it a great comet. LoL. So, pray that it holds together until after perihelion.

Now, for my next update, I present my best image so far of Comet ISON from Sunday, Nov 3rd, 2013:



Looks like its longer than the moon's diameter, now. Perhaps just a tad shy of 40'. That end portion is very dim, though.


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CygnuS
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Re: C/2012 S1 ISON new [Re: Mike B.]
      #6180124 - 11/06/13 10:35 PM

Thanks for another great image Mike.
The clouds here in Pennsylvania are killing me but I can always depend on your latest work of CCD art.


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urassner
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Re: C/2012 S1 ISON new [Re: CygnuS]
      #6180309 - 11/07/13 01:53 AM Attachment (23 downloads)

Beautiful images, Mike. Thanks for sharing them. I made an animated gif taken from within the light polluted city. 25 frames, each frame 80 seconds (4 x 20 s) to show the movement. I had to compress it quite a bit due to the maximum file size requirement.
Any suggestions on how I can improve it are appreciated.


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urassner
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Re: C/2012 S1 ISON new [Re: urassner]
      #6180312 - 11/07/13 01:55 AM Attachment (28 downloads)

Sorry forgot to save it so it loops.

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urassner
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Re: C/2012 S1 ISON new [Re: urassner]
      #6180313 - 11/07/13 01:57 AM Attachment (94 downloads)

Here all the frames combined.

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Rich (RLTYS)Moderator
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Re: C/2012 S1 ISON new [Re: urassner]
      #6180401 - 11/07/13 06:32 AM

Looks good, image shows a nice long tail. Thanks for the view.

Rich (RLTYS)


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MawkHawk
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Re: C/2012 S1 ISON new [Re: PowellAstro]
      #6181743 - 11/07/13 08:00 PM

Quote:

Does anyone have or know the data needed to key ISONs data into an Autostar hand controller?




You can get this data live from here:
ISON Live


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PowellAstro
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Re: C/2012 S1 ISON new [Re: MawkHawk]
      #6182147 - 11/08/13 01:13 AM

Thanks, I have it in now. Just need the clouds to clear out.

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Re: C/2012 S1 ISON new [Re: PowellAstro]
      #6182800 - 11/08/13 11:47 AM

Great job guys- and Mike, that's the best image of ISON I've seen yet- congrats!

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BSJ
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Re: C/2012 S1 ISON new [Re: BrooksObs]
      #6222032 - 11/28/13 05:39 PM

Quote:

Quote:

"This disintegration will take place before it reaches perihelion,"

http://www.spacedaily.com/reports/Is_the_Christmas_Comet_cracking_up_999.html




Sadly, just a rehash of misinformation put forth by "staff writers" and one supposed South American "astronomer" with a highly questionable reputation for making predictions that don't pan out.

BrooksObs




So, the questionable astronomer was right...


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Tonk
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Re: C/2012 S1 ISON new [Re: BSJ]
      #6222078 - 11/28/13 06:01 PM

Quote:

So, the questionable astronomer was right...





Not quite - his most recent prediction was for about 2 weeks ago. We can all play pin the tail on the donkey

A break up 1 hour from perihelion is far less questionable


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