Rev 61 Enceladus (March 12 2008) |
Rev 61 Enceladus (March 12 2008) |
Mar 8 2008, 10:15 PM
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#1
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Member Group: Members Posts: 544 Joined: 17-November 05 From: Oklahoma Member No.: 557 |
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Mar 13 2008, 04:40 PM
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#2
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Member Group: Members Posts: 401 Joined: 5-January 07 From: Manchester England Member No.: 1563 |
QUOTE Weird... re-frozen cryo-volcanoes..? The crater to the upper left of the two marked seems to have something similar. It'll be interesting to see how many craters have this effect, and if its in anyway related to size.The image that pops into my head is a large impact producing a temporary lake of liquid water underneath it, which powers cryovolcanism. -------------------- |
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Mar 13 2008, 04:46 PM
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#3
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
The crater to the upper left of the two marked seems to have something similar. It'll be interesting to see how many craters have this effect, and if its in anyway related to size.The image that pops into my head is a large impact producing a temporary lake of liquid water underneath it, which powers cryovolcanism. Or it punches through to a liquid layer and the open throat is the source for upwelling. Just like the Evil eye of W Quivira or Coats Facula on Titan? I can't wait to measure the ratio of inner diameter vs. rim diameter. It looks pretty similar. -Mike -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Mar 13 2008, 06:14 PM
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#4
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
I took um3k's image (Stu's annotation added) and zoomed in on "3":
Side by side comparison with the T25 RADAR image of the "Evil eye" W Quivira feature on Titan (annotated and unannotated versions). The ratio of inner bulge and outer rim diameter are real close, even though "Evil eye" feature on Titan is ca. 5x bigger. The central domes look larger and a little bit rougher ("bulgier?") than normal. Topography would help illuminate this (that's a stretch for a "shape from shading" pun). Maybe these are central dome craters where the rebound just didn't know when to stop? -Mike [EDIT: Just saw Emily's post. Fracturing would make the central domes look rougher. Might also explain the Evil eye of Titan if it is indeed a fractured-up central dome crater.] -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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