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C/2012 S1 ISON

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#1 John Wunderlin

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Posted 15 January 2013 - 11:43 PM

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....h?v=hJesmSemxNY

Here is a stack on the comet:

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#2 Rich (RLTYS)

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Posted 16 January 2013 - 06:20 AM

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

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#3 norton67

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Posted 16 January 2013 - 08:14 AM

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

#4 John Wunderlin

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Posted 16 January 2013 - 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.

#5 Dave Mitsky

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Posted 16 January 2013 - 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.spaceweat...=c6h44mt4ukg...

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#6 John Wunderlin

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Posted 16 January 2013 - 12:43 PM

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

#7 Mike Phillips

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Posted 16 January 2013 - 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

#8 Tonk

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Posted 17 January 2013 - 05:57 AM

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

#9 John Wunderlin

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Posted 17 January 2013 - 01:35 PM

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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#10 John Wunderlin

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Posted 17 January 2013 - 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.

#11 timewarp

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Posted 18 January 2013 - 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?

#12 Rich (RLTYS)

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Posted 18 January 2013 - 06:00 AM

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. :bow:

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#13 John Wunderlin

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Posted 18 January 2013 - 12:17 PM

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.

#14 John Wunderlin

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Posted 18 January 2013 - 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.

#15 canukLX90

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Posted 19 January 2013 - 01:26 PM

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

PJ

#16 John Wunderlin

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Posted 13 February 2013 - 02:51 AM

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.

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#17 John Wunderlin

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Posted 13 February 2013 - 03:00 AM

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

#18 Rich (RLTYS)

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Posted 13 February 2013 - 07:55 AM

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

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#19 John Wunderlin

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Posted 13 February 2013 - 11:12 AM

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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#20 John Wunderlin

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Posted 13 February 2013 - 11:17 AM

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 :)

#21 Tonk

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Posted 13 February 2013 - 12:00 PM

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

#22 John Wunderlin

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Posted 13 February 2013 - 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!

#23 Special Ed

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Posted 13 February 2013 - 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. :)

#24 canukLX90

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Posted 14 February 2013 - 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

#25 hiro

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Posted 24 February 2013 - 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.co...roc/8501810109/






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