Rhea Revisited, Mosaics from the 30 August 2007 Encounter |
Rhea Revisited, Mosaics from the 30 August 2007 Encounter |
Aug 28 2008, 03:37 AM
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SewingMachine Group: Members Posts: 316 Joined: 27-September 05 From: Seattle Member No.: 510 |
In the excitement leading up to the Iapetus flyby twelve days later, the 5000 km-range nontargeted Rhea encounter (49RH) recieved relatively little attention here. As we all know, Rhea is the most dynamic and thrilling of the worlds in orbit around Saturn, and I'm certain that the short shrift it's been given infuriates you all to the point of aneurysm. A combination of sucktastic downsampling on the raws page, smeared Saturnshine, and equatorial-ridge envy doomed this beautiful visit to oblivion. As I've had the pleasure of taking a day off to play with these (thanks Emily for that awesome Selected ISS Data page!) I'm proud/drunk to present The Forgotten Flyby.
-------------------- ...if you don't like my melody, i'll sing it in a major key, i'll sing it very happily. heavens! everybody's all aboard? let's take it back to that minor chord...
Exploitcorporations on Flickr (in progress) : https://www.flickr.com/photos/135024395@N07/ |
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Aug 29 2008, 01:42 PM
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Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
The Gehrels Asteroid book indicates the Iapetan dark stuff is quite similar to D type asteroid spectra.
IIRC, we also have Cassini data indicating the Hyperion and Iapetan dark stuffs are quite similar to each other. Also note, the Iapetan dark stuff shows a visual subtle color shift going from east to west (or west to east if you think about it). To me, the color shift is kind of a problem for the folks theorizing the dark stuff is evaporative residue. Particularly if there is a mechanism for an externally sourced dark material that might sequentially apply (react?) longitudinally in synchrony with Iapetus' position around Saturn. |
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