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C/2012 S1 ISON

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#126 Dave Mitsky

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Posted 18 September 2013 - 02:14 PM

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.

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#127 Jarad

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Posted 19 September 2013 - 12:55 PM

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.

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#128 CygnuS

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Posted 19 September 2013 - 10:19 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.

#129 hiro

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Posted 21 September 2013 - 05:55 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.

Posted Image

Data and original are here.
http://www.flickr.co...roc/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

#130 Rich (RLTYS)

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Posted 21 September 2013 - 06:32 AM

Looks good. :bow:

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#131 CygnuS

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Posted 21 September 2013 - 02:10 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.

#132 John Wunderlin

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Posted 21 September 2013 - 08:52 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.

#133 hiro

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Posted 21 September 2013 - 10:48 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.

Posted Image

Data and original are here.
http://www.flickr.co...roc/9866508094/

We may be able to enjoy better view next month.

#134 CygnuS

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Posted 25 September 2013 - 08:52 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.

#135 BrooksObs

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Posted 26 September 2013 - 10:21 AM

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

#136 Adam Taylor

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Posted 26 September 2013 - 03:28 PM

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.

#137 MessiToM

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Posted 26 September 2013 - 07:50 PM

Negative Nancy's LOL

#138 CygnuS

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Posted 26 September 2013 - 09:00 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.


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.

#139 Dave Mitsky

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Posted 27 September 2013 - 01:32 AM

There's an interesting update on Comet ISON at
http://www.skyandtel...met-ISON-Upd...

Dave Mitsky

#140 Tonk

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Posted 27 September 2013 - 03:07 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 :)

#141 hiro

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Posted 27 September 2013 - 10:22 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.

Posted Image

Data and original are here.
http://www.flickr.co...roc/9966413925/

#142 CygnuS

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Posted 27 September 2013 - 04:25 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?)

#143 hiro

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Posted 27 September 2013 - 09:26 PM

Thanks CygnuS in The Great Rift.

#144 jshalpha

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Posted 28 September 2013 - 10:36 PM

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

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

Jim S.

#145 hiro

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Posted 28 September 2013 - 11:29 PM

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?

#146 CygnuS

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Posted 29 September 2013 - 10:40 AM

Look great Jim!

#147 jshalpha

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Posted 29 September 2013 - 10:55 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.

#148 canukLX90

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Posted 29 September 2013 - 12:57 PM

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

PJ

#149 Dave Mitsky

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Posted 03 October 2013 - 12:21 PM

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

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#150 John Wunderlin

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Posted 03 October 2013 - 12:27 PM

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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