Helene Image Products |
Helene Image Products |
Apr 4 2012, 08:11 AM
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#1
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Helene from distance ~7000 km. Date 18.6.2011. Red, green a blue (BL1) filter. Resolution is ~42 m/pix.
EDIT: I uploaded new version of the image without three prominent specks of noise. -------------------- |
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Apr 9 2012, 02:30 PM
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#2
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Solar System Cartographer Group: Members Posts: 10121 Joined: 5-April 05 From: Canada Member No.: 227 |
An older harder crust that is being stripped away does look like the best explanation for this. If the crust lies over loose regolith, that might allow downslope movement to undermine the crusty patches and gradually eat away at them. But why do we have a crust like this? The surface of Calypso may be similar.
One of the big puzzles with these small moons is why they are so different. Janus and Epimetheus seem to have patches of dark smooth material in depressions. Helene and maybe Calypso have extensive evidence of downslope movement like this. Hyperion is incredibly rough, Telesto very smooth. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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