29-30 August 2007 Icy Satellites (rev 49), Last stop on the road to Iapetus |
29-30 August 2007 Icy Satellites (rev 49), Last stop on the road to Iapetus |
Aug 31 2007, 06:48 PM
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#16
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Sorry for the confusion, you guys; let me try posting a clarification. If this works, I'm talking about the circled area, though the "dark spot" may be a semi-shadowed crater; the phase angle's pretty high:
-------------------- 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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Guest_AlexBlackwell_* |
Aug 31 2007, 06:54 PM
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#17
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Guests |
Sorry for the confusion, you guys; let me try posting a clarification. If this works, I'm talking about the circled area, though the "dark spot" may be a semi-shadowed crater; the phase angle's pretty high: Maybe if you drew an arrow to the features, that would help. All I see are craters. And more craters. What is interesting, at least to me, is the lighter-toned substrate exposed by impact gardening and/or downslope movement on crater walls. We've see this on other satellites. |
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Aug 31 2007, 07:18 PM
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#18
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Okay. Yeah, the light-toned substrate is the "albedo feature" I referred to, and here's that silly dark spot (which I'm now convinced is merely a shallow crater):
Sorry for the tempest in a teapot...(we need an embarrassment emoticon, here...) -------------------- 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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Aug 31 2007, 10:05 PM
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#19
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Some of the Rhea images are starting to show up on the JPL raw images page, including a beautiful WA set with Saturn in the background.
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Aug 31 2007, 10:57 PM
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#20
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
-------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Sep 1 2007, 12:22 AM
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#21
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Member Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 |
Not just craters on Rhea:
http://saturn.jpl.nasa.gov/multimedia/imag...3/N00090796.jpg Crater chain or tectonic feature ? Marc. |
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Sep 1 2007, 12:48 AM
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#22
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
I've been saying for many, many months that Rhea exhibits more crater chains than I've ever seen on any other body in the Solar System. It has led me to speculate, here in this very forum, as to whether these chains are controlled exogenically (i.e., actual impact crater chains) or endogenically (i.e., tectonic features/fractures).
Note that the feature you linked to has a very small accompanying feature to the right and below (as this image is oriented). That much smaller feature is parallel to the larger feature. To me, that argues for endogenic control of these features. I think that the rather large population of such chain features makes Rhea a lot more interesting than most everyone else here thinks. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Sep 1 2007, 12:54 AM
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#23
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Senior Member Group: Moderator Posts: 3234 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Highest resolution observations of Odysseus impact basin on Tethys:
http://saturn.jpl.nasa.gov/multimedia/imag...iImageID=124822 http://saturn.jpl.nasa.gov/multimedia/imag...iImageID=124817 -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Sep 1 2007, 01:17 AM
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#24
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Member Group: Members Posts: 259 Joined: 23-January 05 From: Seattle, WA Member No.: 156 |
That first one almost looks like it's got a rille or two in it, though I'm guessing it's just some fortuitous shadows.
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Sep 1 2007, 02:00 AM
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#25
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Jason, I've seen this explained before but I keep forgetting the explanation. Can you explain the origin of the every-other-line truncation that appears in Cassini images that have lots of detail?
I love the sharp peaky shadows cast by the peak ring of Odysseus. --Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Sep 1 2007, 02:09 AM
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#26
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
A long and narrow crater chain (?) on Rhea:
http://saturn.jpl.nasa.gov/multimedia/imag...iImageID=124693 Rhea sure has a lot of these features. |
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Sep 1 2007, 03:24 AM
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#27
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Junior Member Group: Members Posts: 66 Joined: 8-November 05 From: Australia Member No.: 547 |
Are any of the commercial photo packages (like Adobe) able to interpolate and fill in the truncated lines? eg by averaging the surrounding pixels?
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Sep 1 2007, 03:29 AM
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#28
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Sep 1 2007, 03:30 AM
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#29
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Nice! My quick'n'dirty versions of the first three sets... Awesome composites, Emily! -------------------- |
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Sep 1 2007, 04:56 AM
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#30
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Getting back on the horse after it threw me, as it were...(and if I'm being a complete clown, please somebody tell me so!!!)
Nice indeed, Emily! Anyone else struck by the fact that the NW rim of Oydessus is practically worn into the landscape to the degree that it's virtually indistinguishable from the surrounding terrain? Means it's very old of course, but why just here? Was the impact a sort of glancing blow (i.e., oblique?), or did some sort of internal activity erase this portion of the rim, as well as a small segment in the SE quadrant? -------------------- 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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