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Comet ISON |
 Nov 28 2013, 06:15 PM
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#166
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 Senior Member  Group: Members Posts: 1670 Joined: 5-March 05 From: Boulder, CO Member No.: 184  |
Funny that the Google Chat (Also on NASA TV) says ISON is at the expected brightness. Have they been looking at the latest C2 images?
-------------------- Steve [ my home page and planetary maps page ]
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Nov 28 2013, 06:20 PM
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#167
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Member Group: Members Posts: 282 Joined: 18-June 04 Member No.: 84 |
wow, i think it may have completely disintegrated and disappeared !!
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Nov 28 2013, 06:20 PM
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#168
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 Member Group: Members Posts: 723 Joined: 13-June 04 Member No.: 82 |
QUOTE (scalbers @ Nov 28 2013, 06:15 PM)  Funny that the Google Chat (Also on NASA TV) says ISON is at the expected brightness. Have they been looking at the latest C2 images? I was wondering that myself. My first thoiught is that this is a delayed broadcast, but if they are taking questions live, it couldn't be. So either they have access to new data that has not hit the internet yet, or they are woefully unprepared. Or ISON is still at its expected brightness following its long-term trend, excluding its periodic outbursts. |
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Nov 28 2013, 06:25 PM
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#169
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 Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
the comet is not visible in the SDO field of view... http://cometison.gsfc.nasa.gov/
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Nov 28 2013, 06:41 PM
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#170
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Senior Member Group: Members Posts: 1670 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
QUOTE (Mongo @ Nov 28 2013, 07:20 PM) I was wondering that myself. My first thoiught is that this is a delayed broadcast, but if they are taking questions live, it couldn't be. So either they have access to new data that has not hit the internet yet, or they are woefully unprepared. Or ISON is still at its expected brightness following its long-term trend, excluding its periodic outbursts. They've caught up now as they interviewed the Bad Astronomer guy who properly showed and explained the latest C2/C3 images The hangout is from the SDO control room, so they aren't directly watching SOHO as much. Now a report on comets-ml (Jakob Cerny) that the 1740 C2 image shows virtually no head and all tail. http://www.kommet.cz/datas/users/ison-failed-3_1.png The mystery on the hangout now is that nothing is visible on SDO images (as Paolo noted). STEREO-A at 1809UTC shows at least a long curving tail. -------------------- Steve [ my home page and planetary maps page ]
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Nov 28 2013, 07:13 PM
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#171
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 Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
QUOTE (Paolo @ Nov 28 2013, 07:25 PM) the comet is not visible in the SDO field of view... http://cometison.gsfc.nasa.gov/ True in UV channels, Paolo... however, In the visible light channel there is something interesting:
luminosity enhanced version of AIA4500 image with enlarged detail (from 4k resolution) Could be a cosmic ray hit but could be also the remnant of the nucleus (at least 10 fragments)... 
-------------------- I always think before posting! - Marco -
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Nov 28 2013, 07:17 PM
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#172
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 Senior Member Group: Members Posts: 2113 Joined: 13-February 10 From: Ontario Member No.: 5221 |
Till the fat lady sings, as they say...
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Nov 28 2013, 07:28 PM
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#173
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Member Group: Members Posts: 282 Joined: 18-June 04 Member No.: 84 |
This is from the STEREO Ahead probe
http://stereo.gsfc.nasa.gov/browse/2013/11...83924_d7c2A.jpg It still looks bright???? 
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Nov 28 2013, 07:41 PM
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#174
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
QUOTE (xflare @ Nov 28 2013, 08:28 PM) It still looks bright???? I think it's normal, you are observing dust emitted hours ago from nucleus, now pushed away from solar radiation pressure, nothing directly connected to present nucleus position/existence... Last AIA4500 SDO image (1 hour after previous one) still show a single luminous object but I am not sure about it's nature (again, inset from 4k version was enhanced in luminosity):
Attached thumbnail(s)
-------------------- I always think before posting! - Marco -
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Nov 28 2013, 07:42 PM
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#175
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Member Group: Members Posts: 723 Joined: 13-June 04 Member No.: 82 |
QUOTE (xflare @ Nov 28 2013, 08:28 PM) This is from the STEREO Ahead probe http://stereo.gsfc.nasa.gov/browse/2013/11...83924_d7c2A.jpg It still looks bright???? Yes, I've been looking at those. There definitely is SOMETHING still following ISON's projected orbital path, the question is whether it's an intact nucleus or a cloud of rocky fragments. I want to see the next several frames as they are released over the next hour or so, but it's certainly possible that ISON pulled another Lovejoy and will spring back to life as it departs the Sun. At least I hope so, I admit that it doesn't look good right now. |
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Nov 28 2013, 08:09 PM
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#176
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Senior Member Group: Members Posts: 1670 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Me too Mongo - I'll estimate that any remnants of the head should reach the C2 occulting disk with images taken around (or just before) 1930UTC. The new 1912UTC image isn't showing anything yet (on the due east side).
-------------------- Steve [ my home page and planetary maps page ]
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Nov 28 2013, 08:20 PM
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#177
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Member Group: Members Posts: 282 Joined: 18-June 04 Member No.: 84 |
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Nov 28 2013, 08:25 PM
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#178
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 Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
QUOTE (xflare @ Nov 28 2013, 09:20 PM) Yes it really look like 'something' is peeking out in that image.  But yes, as for earlier comments I can see that some here must have noted that some astronomers thought that ISON would break up. In reply to the next post by xflare. Yup! | | V |
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Nov 28 2013, 08:26 PM
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#179
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Member Group: Members Posts: 282 Joined: 18-June 04 Member No.: 84 |
Determinately something there now in the latest image.
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Nov 28 2013, 08:32 PM
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#180
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 Merciless Robot Group: Admin Posts: 8789 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
xflare, you got a screengrab to share? Site is getting hammered.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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