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John Wunderlin
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Loc: Mineral Point, Wi
C/2012 S1 ISON
      #5625463 - 01/15/13 11:43 PM Attachment (141 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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Reged: 12/11/12

Loc: Michigan
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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Dave Mitsky
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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 (91 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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Reged: 12/25/08

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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 (65 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 (65 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 [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 [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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