Comet ISON |
Comet ISON |
Dec 1 2013, 04:10 AM
Post
#271
|
|
Founder Group: Chairman Posts: 14431 Joined: 8-February 04 Member No.: 1 |
Again - you're proposing an utter overhaul on not just the nuclei of comets, but the ground and space based observations of THIS comet - based on the fact that one instrument on one spacecraft didn't see one particular thing.
Moreover - we don't know for sure that SDO didn't see it. We've simply seen the uncalibrated browse data - not processed science products yet. It may well make its presence known in the SDO data yet. |
|
|
Dec 1 2013, 09:51 PM
Post
#272
|
|
Senior Member Group: Members Posts: 1625 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Still there in this STEREO-A view in the upper right
http://stereo-ssc.nascom.nasa.gov/browse/2...11801_s7h1A.jpg Good discussion in this CBET telegram here: http://groups.yahoo.com/neo/groups/comets-...ns/topics/22839 -------------------- Steve [ my home page and planetary maps page ]
|
|
|
Dec 1 2013, 11:49 PM
Post
#273
|
|
Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
Good discussion in this CBET telegram here: Thank you for that link. While it it for a while did look promising that at least some part of ISON had made it. It seem increasingly likely that what we did see where a 'ghost' with gas and particles - so Monty Python get a nod for his "Ain't Dead Yet" reference earlier - it appear to cover this most closely. |
|
|
Dec 3 2013, 01:58 AM
Post
#274
|
|
Member Group: Members Posts: 699 Joined: 1-April 08 From: Minnesota ! Member No.: 4081 |
And the most amazing animation of ISON's ashes being scattered in the solar wind was that of E Lakdawalla's Stereo B images in post #236
http://planetary.s3.amazonaws.com/assets/i...83900_dbc2B.gif |
|
|
Dec 3 2013, 08:23 PM
Post
#275
|
|
Senior Member Group: Members Posts: 1625 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
This is the last frame I can see it in, after that it appears to have faded...
http://stereo-ssc.nascom.nasa.gov/browse/2...31801_s7h1A.jpg Thus maybe December 2nd will end up being the last observation? -------------------- Steve [ my home page and planetary maps page ]
|
|
|
Dec 5 2013, 08:31 AM
Post
#276
|
|
Member Group: Members Posts: 146 Joined: 23-August 06 From: Vriezenveen, Netherlands Member No.: 1067 |
What's the current status of ISON? Has Hubble or any other telescope viewed what is left of of ISON (if there is any)?
|
|
|
Dec 5 2013, 01:51 PM
Post
#277
|
|
Forum Contributor Group: Members Posts: 1372 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
Most of the consensus is ISON was destroyed by the Sun and what we saw fly away from the Sun briefly was the dusty debris.
|
|
|
Dec 5 2013, 07:05 PM
Post
#278
|
|
Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
I find it fascinating that the Science channel has been advertising a special called "Supercomet ISON" that will air this coming Saturday, IIRC. Even well past perihelion they were using the old ad copy saying it's 3 miles across and will soon be bright in our evening skies.
They are going ahead with the special program, but the ads now say (slightly paraphrased) "It's just gone around the sun -- but what happened then? Tune in and find out!" -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
|
|
|
Dec 6 2013, 07:35 PM
Post
#279
|
|
Junior Member Group: Members Posts: 78 Joined: 16-October 12 From: Pennsylvania Member No.: 6711 |
I'm sure the network paid for the program far in advance. It would be a shame to waste it now just because the comet no longer exists. Ahh, the power of advertising.
And hype. |
|
|
Dec 6 2013, 08:16 PM
Post
#280
|
|
Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
Hubble doesn't point near the Sun, so it was never an option for imaging ISON near perihelion. Hubble has never imaged Mercury and has only imaged Venus, AFAIK, once. This restriction is because of fears of damaging it. Other space telescopes are designed to observe nearer the Sun (or AT the Sun) and those produced many of the best observations of ISON.
|
|
|
Dec 6 2013, 11:00 PM
Post
#281
|
|
Senior Member Group: Members Posts: 1625 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
What's the current status of ISON? Has Hubble or any other telescope viewed what is left of of ISON (if there is any)? Current status appears to be that it is visible in binoculars (December 6) to skilled observers, especially at high northern latitudes (where the geometry is best) like this report from Poland. It's apparently still a diffuse object about 15 arc minutes in diameter about 7.5 magnitude. http://groups.yahoo.com/neo/groups/comets-...ns/topics/22913 A second observer visually saw it from Spain on December 7th at magnitude 7.2 (also on comets-ml). Interesting that there is skepticism about these sightings on the Sungrazer Twitter feed, where it's stated the comet should be 11th magnitude. Also a couple of negative results with images posted in Spaceweather.com. Also, a nice STEREO animation from back on December 1 (by Alan Watson on comets-ml): http://3.bp.blogspot.com/-u2oT6rAew8c/Up6C...son-hi1a-10.gif And a still STEREO shot (Tony Scarmato - comets-ml) from December 4th: https://fbcdn-sphotos-a-a.akamaihd.net/hpho...586950229_n.jpg -------------------- Steve [ my home page and planetary maps page ]
|
|
|
Dec 21 2013, 05:33 PM
Post
#282
|
|
Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
the Hubble Space Telescope did not detect any debris from ISON, despite going as deep as the 25th magnitude
http://hubblesite.org/hubble_discoveries/c...n-is-still-dead |
|
|
Dec 21 2013, 11:57 PM
Post
#283
|
|
Senior Member Group: Members Posts: 1625 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
It seems a lot of the Hubble and other recent "upper limits" may have been for the magnitude of a point object. It would give me a better feel for the overall ability to detect something if a magnitude per unit area was also considered. This corresponds to the surface brightness of an extended object.
This point is mentioned in comets-ml as well, here: http://groups.yahoo.com/neo/groups/comets-...ns/topics/23004 -------------------- Steve [ my home page and planetary maps page ]
|
|
|
Lo-Fi Version | Time is now: 19th April 2024 - 08:56 PM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |