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Rosetta flyby of Asteroid Steins, 5th September 2008
peter59
post Jun 19 2008, 06:53 AM
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Only 78 days to Stein encounter ! I can't believe I forgot about this event.


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volcanopele
post Sep 7 2008, 06:56 PM
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Very good point, Phil. If these are impact craters, that would be most likely explanation. These can't be secondary impacts, Steins has too little gravity to pull ejected material back in. Any material from that north polar impact crater would be long gone, except very slow moving ejecta...and they wouldn't form craters, those would show up as boulders on the surface (resolution too low to resolve these). As others have explained effectively, these likely aren't a crater chain caused by a broken-up impactor, Steins is too small, and rotates too slowly. And it would certainly NOT break up an in-coming body, Steins is not Jupiter. I'm willing to bet that Steins just about fills up its Roche lobe.

So you are back to either a pit chain, a la Phobos, or just a coincidental arrangement of craters.


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Posts in this topic
- peter59   Rosetta flyby of Asteroid Steins   Jun 19 2008, 06:53 AM
- - Stu   Gerhard has been given Lou Friedman's mic from...   Sep 6 2008, 10:12 AM
- - elakdawalla   There's a dropdown menu from which you can sel...   Sep 6 2008, 10:20 AM
- - Stu   Morning Emily! Isn't it great to have a li...   Sep 6 2008, 10:22 AM
|- - Hungry4info   QUOTE (Stu @ Sep 6 2008, 04:22 AM) Mornin...   Sep 6 2008, 10:23 AM
|- - djellison   QUOTE (Stu @ Sep 6 2008, 11:22 AM) ESA is...   Sep 6 2008, 10:28 AM
|- - ustrax   QUOTE (djellison @ Sep 6 2008, 11:28 AM) ...   Sep 6 2008, 10:35 AM
|- - djellison   QUOTE (ustrax @ Sep 6 2008, 11:35 AM) Gue...   Sep 6 2008, 10:39 AM
- - Astro0   We're watching in Australia too! Morning?...   Sep 6 2008, 10:25 AM
|- - elakdawalla   QUOTE (Astro0 @ Sep 6 2008, 03:25 AM) EDI...   Sep 6 2008, 10:40 AM
- - Stu   That's a VERY poor model of a dalek on the rig...   Sep 6 2008, 10:31 AM
- - djellison   9 minute before closest approach the OSIRIS-NAC tu...   Sep 6 2008, 10:46 AM
|- - ustrax   There's the little sucker! Edited: You gu...   Sep 6 2008, 10:49 AM
|- - ugordan   QUOTE (djellison @ Sep 6 2008, 12:46 PM) ...   Sep 6 2008, 10:52 AM
|- - peter59   QUOTE (djellison @ Sep 6 2008, 10:46 AM) ...   Sep 6 2008, 10:55 AM
- - Hungry4info   =O OMG Gigantic crater on top.   Sep 6 2008, 10:48 AM
- - djellison   Here we go   Sep 6 2008, 10:48 AM
- - Astro0   Press conference images... Panelists: Asteroid ...   Sep 6 2008, 10:48 AM
- - volcanopele   Should have said Helene-shaped. for comparison:   Sep 6 2008, 10:51 AM
- - djellison   I had grab open, set to 'selection' - phot...   Sep 6 2008, 10:51 AM
- - djellison   Uwe used the phrase Safe Mode - which I wouldn...   Sep 6 2008, 10:54 AM
- - Astro0   Colour - early version.   Sep 6 2008, 10:54 AM
|- - climber   QUOTE (Astro0 @ Sep 6 2008, 12:54 PM) C...   Sep 6 2008, 10:57 AM
- - Astro0   3D!   Sep 6 2008, 10:57 AM
- - Astro0   Quick animated gif. Edit: Slowed down a little   Sep 6 2008, 10:59 AM
- - belleraphon1   Good Day everyone... Nice job ESA!!...   Sep 6 2008, 11:00 AM
- - TheChemist   Good day everyone ! Another chair would be use...   Sep 6 2008, 11:04 AM
- - Astro0   If she just gives UMSF the data, we'll get it ...   Sep 6 2008, 11:04 AM
- - djellison   Ahhh - looks like ESA is setting up a NEO program....   Sep 6 2008, 11:13 AM
|- - elakdawalla   QUOTE (djellison @ Sep 6 2008, 04:13 AM) ...   Sep 6 2008, 11:15 AM
|- - ustrax   QUOTE (djellison @ Sep 6 2008, 12:13 PM) ...   Sep 6 2008, 08:19 PM
- - elakdawalla   Images are up http://www.esa.int/SPECIALS/Rosetta/...   Sep 6 2008, 11:21 AM
|- - ugordan   Looks like the NAC safe mode was indeed inadverten...   Sep 6 2008, 11:23 AM
|- - ustrax   ESA's work is great now we just need decent jo...   Sep 6 2008, 11:23 AM
- - djellison   Sounds like they just set some very conservative w...   Sep 6 2008, 11:22 AM
- - belleraphon1   Sounds like the NAC turn off was intentional? Or n...   Sep 6 2008, 11:24 AM
|- - dilo   Thanks to all for great coverage, especially to Em...   Sep 6 2008, 11:27 AM
- - OWW   Stupid journalists. Am I the only one who really w...   Sep 6 2008, 11:29 AM
|- - ugordan   QUOTE (OWW @ Sep 6 2008, 01:29 PM) Am I t...   Sep 6 2008, 11:32 AM
||- - ugordan   QUOTE (ugordan @ Sep 6 2008, 01:32 PM) FW...   Sep 6 2008, 12:10 PM
||- - David   QUOTE (ugordan @ Sep 6 2008, 01:10 PM) .....   Sep 6 2008, 12:15 PM
|- - TheChemist   QUOTE (OWW @ Sep 6 2008, 02:29 PM) Stupid...   Sep 6 2008, 11:34 AM
- - belleraphon1   Doug... you are right... software parameters for...   Sep 6 2008, 11:29 AM
- - elakdawalla   OK, I'm going back to bed now. If I may make ...   Sep 6 2008, 11:30 AM
|- - elakdawalla   QUOTE (elakdawalla @ Sep 6 2008, 04:30 AM...   Sep 6 2008, 11:49 AM
- - Stu   Well, that went pretty well, I think. Definitel...   Sep 6 2008, 11:38 AM
- - Astro0   OK, somebody has to do it and it might as well be ...   Sep 6 2008, 11:39 AM
|- - jumpjack   QUOTE (Astro0 @ Sep 6 2008, 01:39 PM) OK,...   Sep 7 2008, 01:43 PM
|- - Paolo Amoroso   QUOTE (jumpjack @ Sep 7 2008, 03:43 PM) A...   Sep 7 2008, 02:33 PM
|- - siravan   QUOTE (Paolo Amoroso @ Sep 7 2008, 10:33 ...   Sep 7 2008, 03:49 PM
- - elakdawalla   New montage is up. OK, now I'm really going t...   Sep 6 2008, 12:23 PM
|- - climber   QUOTE (elakdawalla @ Sep 6 2008, 02:23 PM...   Sep 6 2008, 06:30 PM
|- - Hungry4info   QUOTE (climber @ Sep 6 2008, 12:30 PM) Tr...   Sep 6 2008, 06:37 PM
||- - David   QUOTE (Hungry4info @ Sep 6 2008, 07:37 PM...   Sep 6 2008, 06:50 PM
||- - centsworth_II   QUOTE (David @ Sep 6 2008, 01:50 PM) No p...   Sep 6 2008, 07:19 PM
||- - vjkane   QUOTE (centsworth_II @ Sep 6 2008, 07:19 ...   Sep 6 2008, 07:57 PM
||- - elakdawalla   QUOTE (vjkane @ Sep 6 2008, 12:57 PM) Emi...   Sep 6 2008, 08:33 PM
||- - David   QUOTE (elakdawalla @ Sep 6 2008, 08:33 PM...   Sep 6 2008, 11:23 PM
||- - ustrax   QUOTE (elakdawalla @ Sep 6 2008, 09:33 PM...   Sep 7 2008, 08:07 AM
|- - JRehling   QUOTE (climber @ Sep 6 2008, 11:30 AM) Tr...   Sep 6 2008, 10:45 PM
- - Stu   Good job, Emily! Seeing as ESA did such a ...   Sep 6 2008, 12:29 PM
|- - Hungry4info   QUOTE (Stu @ Sep 6 2008, 06:29 AM) Seeing...   Sep 6 2008, 12:34 PM
- - Stu   It was actually AstroO's idea originally, I ju...   Sep 6 2008, 12:37 PM
- - Astro0   ...might be nice if UMSF members went on to the Ro...   Sep 6 2008, 12:43 PM
|- - Tman   QUOTE (Astro0 @ Sep 6 2008, 02:43 PM) ......   Sep 6 2008, 02:08 PM
|- - ugordan   Perhaps the comments are awaiting moderation, whic...   Sep 6 2008, 02:18 PM
- - Phil Stooke   This is the full phase view from the six-frame com...   Sep 6 2008, 01:47 PM
|- - tedstryk   Was NAVCAM on? I remember it as having intermedia...   Sep 6 2008, 01:50 PM
|- - ugordan   Interesting question, Ted. If I got it correctly (...   Sep 6 2008, 01:56 PM
|- - tedstryk   QUOTE (ugordan @ Sep 6 2008, 02:56 PM) Af...   Sep 6 2008, 02:00 PM
|- - ugordan   I was thinking along the lines of kilobytes/second...   Sep 6 2008, 02:06 PM
- - siravan   A question regarding the crater chain. How do you ...   Sep 6 2008, 02:22 PM
|- - Hungry4info   QUOTE (siravan @ Sep 6 2008, 08:22 AM) A ...   Sep 6 2008, 02:51 PM
- - Juramike   Hmmmm. I'm not sure it's a crater chain. ...   Sep 6 2008, 03:00 PM
- - belleraphon1   Does Phobos sport some crater chains? Craig   Sep 6 2008, 03:34 PM
|- - Hungry4info   QUOTE (belleraphon1 @ Sep 6 2008, 09:34 A...   Sep 6 2008, 03:49 PM
||- - ugordan   QUOTE (Hungry4info @ Sep 6 2008, 05:49 PM...   Sep 6 2008, 03:55 PM
||- - Hungry4info   QUOTE (ugordan @ Sep 6 2008, 09:55 AM) Th...   Sep 6 2008, 04:33 PM
|- - tty   QUOTE (belleraphon1 @ Sep 6 2008, 05:34 P...   Sep 6 2008, 04:45 PM
- - belleraphon1   Since I cannot reply to the Rosetta blog, I will p...   Sep 6 2008, 03:36 PM
|- - Rakhir   QUOTE (belleraphon1 @ Sep 6 2008, 03:36 P...   Sep 6 2008, 04:12 PM
|- - lyford   QUOTE (Rakhir @ Sep 6 2008, 08:12 AM) But...   Sep 6 2008, 06:11 PM
- - Phil Stooke   Another factor counting against the crater chain b...   Sep 6 2008, 04:41 PM
|- - Hungry4info   QUOTE (Phil Stooke @ Sep 6 2008, 10:41 AM...   Sep 6 2008, 05:53 PM
|- - vjkane   QUOTE (Phil Stooke @ Sep 6 2008, 04:41 PM...   Sep 6 2008, 07:53 PM
- - jsheff   It reminds me of nothing as much as views of Atlas...   Sep 6 2008, 05:04 PM
- - dvandorn   Considering the shape of the body and the location...   Sep 6 2008, 05:28 PM
|- - David   Just where is Steins now anyway? How far away fro...   Sep 6 2008, 05:45 PM
- - PhilCo126   Great flyby... Well, a long wait has started ...   Sep 6 2008, 05:45 PM
|- - tedstryk   QUOTE (PhilCo126 @ Sep 6 2008, 06:45 PM) ...   Sep 6 2008, 06:08 PM
|- - 3488   QUOTE (tedstryk @ Sep 6 2008, 06:08 PM) W...   Sep 6 2008, 07:20 PM
- - Rakhir   Very nice project Emily !   Sep 6 2008, 08:50 PM
- - rogelio   From a botanical perspective, Steins looks like a ...   Sep 6 2008, 09:07 PM
- - volcanopele   Well, I seriously doubt that's a secondary cra...   Sep 7 2008, 04:48 PM
|- - siravan   QUOTE (volcanopele @ Sep 7 2008, 12:48 PM...   Sep 7 2008, 05:05 PM
|- - ugordan   I'm not buying the broken-up impactor idea one...   Sep 7 2008, 05:09 PM
- - Hungry4info   If we assume (do we know?) that the Steins' ax...   Sep 7 2008, 05:06 PM
- - centsworth_II   If an elongate, rubble-pile asteroid like Itokawa ...   Sep 7 2008, 05:59 PM
- - Phil Stooke   Look at a page of text from a bit too far away to ...   Sep 7 2008, 06:04 PM
- - volcanopele   Very good point, Phil. If these are impact crater...   Sep 7 2008, 06:56 PM
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