Rev 131 - May 8-26, 2010 - Enceladus E10 |
Rev 131 - May 8-26, 2010 - Enceladus E10 |
May 9 2010, 06:47 PM
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Nice shot of Rhea against Saturn taken on May 8 2010:
This is the exact same geometry as Planetary Photojournal Image PIA10494. -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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May 19 2010, 08:10 AM
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Senior Member Group: Admin Posts: 3108 Joined: 21-December 05 From: Canberra, Australia Member No.: 615 |
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May 19 2010, 10:46 AM
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Member Group: Members Posts: 125 Joined: 18-July 05 Member No.: 438 |
Absolutely amazing images.
Just trying to interpret the plume jet images... although my brain tends to interpret the structure as being in the background, I guess the "lines" oriented towards the 8 o'clock position must be the shadow of Enceladus falling on the jets, so they're actually foreground features, not background, I think. When oriented with the plume pointed downwards, I guess that means that the large plume jet on the right is all beyond the local horizon and illuminated all the way down to the horizon as seen from Cassini, the middle one straddles the limb so that only part of it is in shadow, while the source of the left-hand jet is in darkness, i.e. closer to Cassini than the limb, and it only becomes visible when it emerges into sunlight. Does everyone else interpret these in the same way? |
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May 19 2010, 03:14 PM
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Senior Member Group: Members Posts: 4252 Joined: 17-January 05 Member No.: 152 |
the large plume jet on the right is all beyond the local horizon and illuminated all the way down to the horizon as seen from Cassini, the middle one straddles the limb so that only part of it is in shadow, while the source of the left-hand jet is in darkness, i.e. closer to Cassini than the limb, and it only becomes visible when it emerges into sunlight. I think I agree. One thing I'd add is that it seems like much of the bright plumes aren't in direct sun, but are illuminated by scattered light, perhaps from the sunlit parts of the plume, or perhaps from Saturn. I've indicated with the black arrow a notch in the central bright plume that aligns with the shadow heading off to the lower left. Presumably below the notch (in the image's orientation) the plume's in full sun, and above (closer to Enceladus) it's lit by scattered light: I'm still puzzled by the appearance of the left plume, in particular why is it's upper right edge oriented the way it is? And I think I can see the central plume in the Enceladus/Titan/rings frame, circled here: It's extremely subtle, which I guess is what you'd expect. When the exposure is set for Titan and the rings, the plumes are extremely faint. |
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