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Comet ISON
Gladstoner
post Sep 24 2012, 11:15 PM
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ngunn
post Nov 20 2013, 11:06 PM
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It's noticeable that it has a blunt front, by which I mean it's rather square at the leading edge. I don't remember seeing this before in comet images. Does this tell us anything, maybe about the intermittent nature of outgassing events?
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djellison
post Nov 21 2013, 12:30 AM
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QUOTE (ngunn @ Nov 20 2013, 03:06 PM) *
It's noticeable that it has a blunt front, by which I mean it's rather square at the leading edge.


In that one image, perhaps. But in others it looks very round. I'd suggest it's probably more of a processing artifact of that image rather than anything else. 22 images stacked of 10 seconds...and the stars appear to be registered....so the Comet was moving. Thus the nucleus is not registered and we are probably seeing the stacking version of motion blur.
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Posts in this topic
- Gladstoner   Comet ISON   Sep 24 2012, 11:15 PM
- - Gladstoner   .   Sep 25 2012, 12:43 AM
- - djellison   What latitude would suit observers? McNaught was ...   Sep 25 2012, 01:14 AM
|- - Gladstoner   .   Sep 25 2012, 01:53 AM
- - dvandorn   I took a quick look at the open front page of your...   Sep 25 2012, 03:03 AM
|- - Gladstoner   .   Sep 25 2012, 03:30 AM
- - Gladstoner   .   Sep 25 2012, 06:53 AM
- - Stu   Ok... STARRY NIGHT is now updating with the orbita...   Sep 25 2012, 04:06 PM
|- - ups   QUOTE (Stu @ Sep 25 2012, 05:06 PM) Ok......   Oct 1 2012, 11:03 PM
- - stevesliva   Definitely a time of year where Seattle has tons o...   Sep 25 2012, 06:27 PM
- - Stu   QUOTE (stevesliva @ Sep 25 2012, 07:27 PM...   Sep 25 2012, 06:38 PM
- - Fred B   This comet makes a very close approach to Mars aro...   Sep 25 2012, 07:58 PM
- - Explorer1   That would be an amazing first! Let's hope...   Sep 25 2012, 08:16 PM
|- - Pertinax   I would guess that Oppy would have little chance f...   Sep 25 2012, 09:02 PM
||- - ngunn   QUOTE (Pertinax @ Sep 25 2012, 10:02 PM) ...   Sep 25 2012, 09:13 PM
|- - rlorenz   QUOTE (Explorer1 @ Sep 25 2012, 04:16 PM)...   Oct 6 2012, 11:56 PM
- - Gladstoner   .   Sep 25 2012, 09:01 PM
- - Gladstoner   .   Sep 25 2012, 09:27 PM
- - Gladstoner   .   Sep 28 2012, 03:26 AM
|- - TheAnt   QUOTE (Gladstoner @ Sep 28 2012, 05:26 AM...   Sep 29 2012, 07:00 PM
|- - Mongo   QUOTE (TheAnt @ Sep 29 2012, 07:00 PM) Ah...   Sep 29 2012, 11:58 PM
- - stevesliva   So it's another Kreutz?   Sep 28 2012, 05:40 AM
|- - Gladstoner   .   Sep 28 2012, 07:06 AM
- - nprev   Nice to be lucky, isn't it? These upcomin...   Sep 30 2012, 12:09 AM
- - dvandorn   For me, Ikeya-Seki was the first contemporary come...   Sep 30 2012, 01:36 AM
|- - tedstryk   QUOTE (dvandorn @ Sep 30 2012, 02:36 AM) ...   Oct 5 2012, 04:49 PM
|- - stevesliva   QUOTE (tedstryk @ Oct 5 2012, 12:49 PM) A...   Oct 7 2012, 05:16 PM
- - Stu   Want to know where to look for Comet ISON in late ...   Sep 30 2012, 02:43 AM
- - Gladstoner   .   Sep 30 2012, 08:26 PM
|- - Eyesonmars   QUOTE (Gladstoner @ Sep 30 2012, 09:26 PM...   Oct 5 2012, 03:06 PM
- - Ant103   But… What do we got there ??   Sep 30 2012, 09:50 PM
- - Gladstoner   .   Oct 1 2012, 07:04 PM
- - Gladstoner   .   Oct 2 2012, 12:20 AM
- - Gladstoner   .   Oct 5 2012, 08:10 AM
- - Eyesonmars   I know that sounds incredible and I had the same r...   Oct 5 2012, 05:03 PM
- - Stu   I was lucky enough to enjoy some really good views...   Oct 5 2012, 07:33 PM
- - ups   It would be amazing to see something like the grea...   Oct 5 2012, 10:07 PM
- - Pertinax   The differing recollections of Hyakutake are great...   Oct 6 2012, 02:10 AM
- - Stu   Don't forget that 2013 will be The Year of the...   Oct 7 2012, 09:21 AM
|- - scalbers   QUOTE (Stu @ Oct 7 2012, 10:21 AM) Don...   Jan 6 2013, 11:29 PM
- - Bjorn Jonsson   It's always somewhere in my mind that things m...   Oct 7 2012, 11:40 AM
- - Stu   QUOTE (Bjorn Jonsson @ Oct 7 2012, 12:40 ...   Oct 7 2012, 12:49 PM
- - Gladstoner   .   Oct 7 2012, 06:38 PM
- - nprev   I plan to be deep in the Mojave Desert with my Cel...   Oct 7 2012, 06:44 PM
- - imipak   Probably little new here for UMSF comet fans, but ...   Oct 12 2012, 06:52 PM
- - TheAnt   The comet ISON were first discovered by Russian as...   Jan 1 2013, 09:15 PM
- - Stu   How, when and where all here on my blog... http:/...   Jan 1 2013, 09:34 PM
|- - TheAnt   QUOTE (Stu @ Jan 1 2013, 10:34 PM) How, w...   Jan 1 2013, 09:45 PM
- - scalbers   Here's my ephemeris that includes tail and vis...   Jan 1 2013, 10:12 PM
|- - scalbers   QUOTE (scalbers @ Jan 1 2013, 11:12 PM) H...   Jan 13 2013, 12:56 AM
- - scalbers   Indeed, Seiichi Yoshida has just calculated a new ...   Jan 19 2013, 03:59 PM
- - Stu   Hmmm. Turns out the idea of imaging Comet ISON fro...   Feb 7 2013, 05:03 PM
- - djellison   I managed to bag a few shots of ISON using a coupl...   Feb 7 2013, 05:10 PM
|- - Tom Dahl   Nice sequence of images, Doug! Thanks for post...   Feb 7 2013, 05:15 PM
- - Stu   Saw those, great work Doug!   Feb 7 2013, 05:15 PM
- - djellison   I'll be honest - I had a tiny insight into wha...   Feb 7 2013, 05:18 PM
- - Stu   RE: Comet ISON   Feb 7 2013, 06:11 PM
- - TheAnt   @Gladstoner: The Andromeda galaxy would be just a ...   Feb 10 2013, 09:35 AM
- - Stu   Oh yes, the binoc view should be really pretty. I...   Feb 10 2013, 11:29 AM
- - TheAnt   @Stu: Light gathering binocs are almost like made ...   Feb 10 2013, 03:06 PM
- - AndyG   I love the picture, Stu, but I suspect you'll ...   Feb 10 2013, 03:59 PM
- - Stu   So much utter, utter crap being talked about onlin...   May 28 2013, 11:28 PM
- - jasedm   There's a lovely crisp animation of the comet...   May 29 2013, 05:05 PM
- - Explorer1   It'll still be close enough for MESSENGER to a...   May 29 2013, 06:24 PM
|- - jasedm   [quote name='Explorer1' date='May 29 2...   May 29 2013, 08:57 PM
|- - Explorer1   Bepi-Colombo is not 'several decades' away...   May 29 2013, 11:45 PM
- - djellison   If you turn on the comet layer in 'Eyes......   May 29 2013, 06:35 PM
- - jasedm   Of course! So much going on, had quite forgott...   May 30 2013, 04:45 PM
- - djellison   99% of the public are not going to know that. The...   May 31 2013, 10:35 PM
|- - tedstryk   QUOTE (djellison @ May 31 2013, 10:35 PM)...   Jun 1 2013, 02:47 AM
- - dvandorn   Yep -- a comet's apparent brightness (and espe...   Jun 1 2013, 01:47 AM
|- - scalbers   QUOTE (dvandorn @ Jun 1 2013, 01:47 AM) Y...   Jun 10 2013, 03:16 PM
- - bkellysky   Good article on line at Sky and Telescope with upd...   Jun 14 2013, 08:46 PM
- - scalbers   Nice article by John Bortle who has so much experi...   Jun 15 2013, 07:08 PM
- - TheAnt   Astronomy now got this update on ISON   Sep 29 2013, 03:35 PM
- - scalbers   I'm continuing with a light curve and visibili...   Sep 29 2013, 06:01 PM
|- - dtolman   QUOTE (scalbers @ Sep 29 2013, 01:01 PM) ...   Nov 15 2013, 04:46 PM
- - Mongo   I love this image taken by Damien Peach on Novembe...   Nov 18 2013, 02:00 AM
- - nprev   Absolutely stunning. I am growing cautiously optim...   Nov 18 2013, 02:18 AM
- - Mongo   Second Major Outburst in Four Days As I am sure y...   Nov 19 2013, 05:56 PM
|- - MahFL   I am going to try spot it tomorrow am, skies are c...   Nov 19 2013, 06:21 PM
- - Mongo   Thumbnail linking to Twitter image of ISON taken N...   Nov 19 2013, 07:24 PM
- - Explorer1   A realtime gallery of the comet from spaceweather....   Nov 19 2013, 08:47 PM
- - Ant103   Here it's cloudy, and will be cloudy for the w...   Nov 20 2013, 08:24 AM
|- - MahFL   Cloudy in NE FL .   Nov 20 2013, 12:01 PM
- - Mongo   From Sky and Telescope's Latest Updates on Com...   Nov 20 2013, 04:21 PM
- - ElkGroveDan   Thanks for these updates Mongo. I thought I mig...   Nov 20 2013, 05:52 PM
- - Mongo   From the Comet ISON Observing Campaign blog for to...   Nov 20 2013, 07:17 PM
- - Mongo   Comet ISON, taken by Terry Lutz & Jeff Adkins ...   Nov 20 2013, 09:43 PM
- - ngunn   It's noticeable that it has a blunt front, by ...   Nov 20 2013, 11:06 PM
|- - djellison   QUOTE (ngunn @ Nov 20 2013, 03:06 PM) It...   Nov 21 2013, 12:30 AM
- - Mongo   A thumbnail linking to a great photo of ISON from ...   Nov 21 2013, 03:57 AM
- - Mongo   Click on thumbnail to go to the Spaceweather.com p...   Nov 21 2013, 01:14 PM
- - Mongo   There are several interesting new posts on comets-...   Nov 21 2013, 04:24 PM
- - Mongo   A very nice image by Gerald Rhemann taken this mor...   Nov 21 2013, 05:40 PM
- - Mongo   Comet 2012 S1 (ISON) Geocentric Distance A real-t...   Nov 21 2013, 05:59 PM
- - Mongo   This exchange on COMETS-ML concerning ISON display...   Nov 21 2013, 09:23 PM
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