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29-30 August 2007 Icy Satellites (rev 49), Last stop on the road to Iapetus
Exploitcorporati...
post Aug 9 2007, 10:40 PM
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CICLOPS' Rev 49 Looking Ahead page is up. Highlights include a fourth monthy Voyager-class encounter with Tethys with 500m resolution over Odysseus (finally!)
Detailed mosaics of Rhea's prominent ray crater and points west are on tap for Old Scabby's second closeup. This should be a really cool periapsis passage to tide us over until the 10th of September.


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DrShank
post Sep 15 2007, 03:13 PM
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Crater Chains:
Ive noticed there are a lot of these long linear features as well on Tethys, Rhea, and Iapetus, and yes even Dione. Ive started doing some fits to them and most do line up as radials to big basins, tho not always the biggest one such as Odysseus. Smaller basins and craters produce such secondary impact chains. We see something similar associated 100-km size craters on Callisto. It is when they fail to line up that they get interesting. that is why the big chains on Callisto must be tidally split comets, since there are no basins they can be linked to. ill have more to say on all this later but am currently working on the paper so have to focus on that. i note that the theory of disruption predicts that there will be no split comets at Saturn, due to its very low density.....
cheers,
paul


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ngunn
post Sep 15 2007, 04:46 PM
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QUOTE (DrShank @ Sep 15 2007, 04:13 PM) *
Crater Chains:
i note that the theory of disruption predicts that there will be no split comets at Saturn, due to its very low density.....


How about a plunge through the rings, especially at a low angle? Could that not disrupt a comet?

Ugordan you're right about planets acting more or less as point masses, so I guess the theory Dr Shank mentions envisages Jupiter's disruptions happening pretty close in. The most uncertain parameter in any such theory must be the cohesive strengths of the comets. I wouldn't be surprised if there is a huge spread, and you might only need a few atypical ones at long intervals to produce the observed alignments on the moons. Therefore I'm a bit wary of the prediction quoted, even without the rings issue.

Interesting. I look forward to reading that paper - maybe here???
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Posts in this topic
- Exploitcorporations   29-30 August 2007 Icy Satellites (rev 49)   Aug 9 2007, 10:40 PM
- - ugordan   Darn it, I'm kind of disappointed. I was expec...   Aug 9 2007, 10:47 PM
- - volcanopele   I should that our Rev49 preview does not include t...   Aug 9 2007, 11:03 PM
|- - ugordan   QUOTE (volcanopele @ Aug 10 2007, 12:03 A...   Aug 10 2007, 10:52 AM
- - Exploitcorporations   Ooooh...double burn!!! I've be...   Aug 9 2007, 11:40 PM
- - belleraphon1   Gosh.... I second the darn it!!!!...   Aug 10 2007, 12:38 AM
- - Del Palmer   Latest Looking Ahead update is now available: htt...   Aug 10 2007, 03:16 AM
- - OWW   I think this dutch proverb is very appropriate: ...   Aug 10 2007, 01:09 PM
- - Rob Pinnegar   I don't often actually laugh out loud at thing...   Aug 10 2007, 01:40 PM
- - edstrick   Hey.. let's not give poor Rhea a hard time. Sh...   Aug 11 2007, 06:30 AM
- - volcanopele   Some raws from the Rhea encounter are now up (hope...   Aug 31 2007, 05:22 PM
|- - ugordan   QUOTE (volcanopele @ Aug 31 2007, 06:22 P...   Aug 31 2007, 06:24 PM
- - nprev   Huh. This image seems to show a lobate flow with s...   Aug 31 2007, 05:44 PM
- - volcanopele   I'm confused, I don't see it.   Aug 31 2007, 06:03 PM
|- - AlexBlackwell   QUOTE (volcanopele @ Aug 31 2007, 08:03 A...   Aug 31 2007, 06:23 PM
- - nprev   Sorry for the confusion, you guys; let me try post...   Aug 31 2007, 06:48 PM
|- - AlexBlackwell   QUOTE (nprev @ Aug 31 2007, 08:48 AM) Sor...   Aug 31 2007, 06:54 PM
- - nprev   Okay. Yeah, the light-toned substrate is the ...   Aug 31 2007, 07:18 PM
- - Bjorn Jonsson   Some of the Rhea images are starting to show up on...   Aug 31 2007, 10:05 PM
- - elakdawalla   Nice! My quick'n'dirty versions of th...   Aug 31 2007, 10:57 PM
|- - Ian R   QUOTE (elakdawalla @ Aug 31 2007, 11:57 P...   Sep 1 2007, 03:30 AM
- - MarcF   Not just craters on Rhea: http://saturn.jpl.nasa....   Sep 1 2007, 12:22 AM
- - dvandorn   I've been saying for many, many months that Rh...   Sep 1 2007, 12:48 AM
- - volcanopele   Highest resolution observations of Odysseus impact...   Sep 1 2007, 12:54 AM
- - Gsnorgathon   That first one almost looks like it's got a ri...   Sep 1 2007, 01:17 AM
- - elakdawalla   Jason, I've seen this explained before but I k...   Sep 1 2007, 02:00 AM
|- - ugordan   QUOTE (elakdawalla @ Sep 1 2007, 03:00 AM...   Sep 1 2007, 08:49 AM
- - Bjorn Jonsson   A long and narrow crater chain (?) on Rhea: http:...   Sep 1 2007, 02:09 AM
- - Big_Gazza   Are any of the commercial photo packages (like Ado...   Sep 1 2007, 03:24 AM
|- - JRehling   QUOTE (Big_Gazza @ Aug 31 2007, 08:24 PM)...   Sep 1 2007, 09:20 PM
|- - elakdawalla   QUOTE (JRehling @ Sep 1 2007, 02:20 PM) I...   Sep 4 2007, 05:26 PM
|- - JRehling   QUOTE (elakdawalla @ Sep 4 2007, 10:26 AM...   Sep 4 2007, 05:38 PM
- - Ian R   Here are the two Odysseus money-shots with the int...   Sep 1 2007, 03:29 AM
- - nprev   Getting back on the horse after it threw me, as it...   Sep 1 2007, 04:56 AM
- - Steve G   The crentral peak area of Oydessus is slightly rem...   Sep 1 2007, 05:08 AM
- - DEChengst   A rough 8 frame Rhea mosaic: http://paranoid.dech...   Sep 1 2007, 11:15 AM
|- - ugordan   QUOTE (DEChengst @ Sep 1 2007, 12:15 PM) ...   Sep 1 2007, 03:54 PM
|- - DEChengst   QUOTE (ugordan @ Sep 1 2007, 05:54 PM) Di...   Sep 1 2007, 04:41 PM
- - MarcF   The floor of the "young" ray crater on R...   Sep 1 2007, 11:24 AM
|- - nprev   QUOTE (MarcF @ Sep 1 2007, 04:24 AM) Both...   Sep 1 2007, 03:21 PM
|- - dvandorn   QUOTE (nprev @ Sep 1 2007, 10:21 AM) The ...   Sep 1 2007, 06:56 PM
|- - ugordan   QUOTE (dvandorn @ Sep 1 2007, 07:56 PM) N...   Sep 1 2007, 07:03 PM
- - MarcF   This WAC picture shows that the previously mention...   Sep 1 2007, 12:27 PM
- - Gsnorgathon   Would anyone here who's more familiar than I w...   Sep 1 2007, 04:44 PM
- - nprev   The collective amount of insight & expertise o...   Sep 1 2007, 07:19 PM
- - Gsnorgathon   Maybe I just haven't been paying close enough ...   Sep 1 2007, 11:17 PM
- - ugordan   I've been casually looking through past Tethys...   Sep 1 2007, 11:19 PM
- - dvandorn   Yes, there are some "chain" features on ...   Sep 2 2007, 12:52 AM
- - DEChengst   A quick 11 frame crescent Rhea: http://paranoid.d...   Sep 2 2007, 01:59 PM
- - ElkGroveDan   Wow! Nice work. I can't imagine what t...   Sep 2 2007, 03:14 PM
- - Adam   Wow indeed! I always loved the crescent images...   Sep 2 2007, 05:39 PM
- - mchan   Badlands is apt. Place looks like a setting for s...   Sep 4 2007, 08:01 AM
- - djellison   What you need is to deinterlace. For this image: ...   Sep 4 2007, 05:32 PM
- - ugordan   Ideally, if the missing lines were all totally bla...   Sep 4 2007, 05:36 PM
- - elakdawalla   OK, I've now done a side-by-side comparison of...   Sep 4 2007, 06:22 PM
- - scalbers   Hi all, I've been working in IDL so I wrote a...   Sep 4 2007, 07:46 PM
|- - scalbers   QUOTE (scalbers @ Sep 4 2007, 07:46 PM) H...   May 17 2008, 03:54 PM
- - elakdawalla   Very sneaky, Steve! Wish I had IDL. I know i...   Sep 4 2007, 08:12 PM
- - scalbers   Interesting as I'm a novice with the IDL virtu...   Sep 4 2007, 09:44 PM
- - elakdawalla   Thanks for the attempt! It didn't work; I...   Sep 4 2007, 10:07 PM
|- - tedstryk   Great explanation of how a mosaic is made and how ...   Sep 5 2007, 12:49 AM
- - Phil Stooke   My trick - select the area containing truncated li...   Sep 5 2007, 12:57 AM
- - volcanopele   Another way is to use a boxfilter to null the pixe...   Sep 5 2007, 02:23 AM
- - ugordan   Wow, great Rhea mosaic there, Emily!   Sep 5 2007, 07:36 AM
- - DrShank   Crater Chains: Ive noticed there are a lot of thes...   Sep 15 2007, 03:13 PM
|- - ugordan   QUOTE (DrShank @ Sep 15 2007, 04:13 PM) i...   Sep 15 2007, 03:18 PM
|- - ngunn   QUOTE (DrShank @ Sep 15 2007, 04:13 PM) C...   Sep 15 2007, 04:46 PM
- - DrShank   i have to admit im short in the theory department....   Sep 15 2007, 06:44 PM
|- - ngunn   QUOTE (DrShank @ Sep 15 2007, 07:44 PM) i...   Sep 15 2007, 08:52 PM
- - alan   If anyone is still interesting in looking at Rhea ...   Sep 15 2007, 07:43 PM
|- - stevesliva   QUOTE (alan @ Sep 15 2007, 03:43 PM) If a...   Sep 15 2007, 09:25 PM
|- - scalbers   Alan - glad to see the raw image improvements. I h...   Sep 16 2007, 10:18 PM
- - MarcF   Did someone try to make the Saturn-shine mosaic of...   Sep 15 2007, 08:07 PM
- - dvandorn   You also have to wonder whether or not the whole f...   Sep 17 2007, 04:24 PM
- - djellison   I don't believe the conspiratorial stuff for a...   Sep 17 2007, 04:36 PM
- - dvandorn   Oh, trust me, I don't seriously believe there ...   Sep 17 2007, 05:09 PM
|- - ugordan   QUOTE (dvandorn @ Sep 17 2007, 06:09 PM) ...   Sep 17 2007, 05:40 PM
- - Decepticon   Hoglanights don't need a image problems/sever ...   Sep 17 2007, 09:46 PM


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