[X] My Assistant

[Decepticon]

Raw images started. Rhea! http://saturn.jpl.nasa.gov/multimedia/imag...heQ=0&storedQ=0

[Phil Stooke]

This really belongs in the 'reprocessing historic images' thread, but I'll be naughty and post it here (spank me!)

Tethys from Voyager 1... I'm posting it to show another view of the craters in this area.

First, you can see the large southern craters, and even the big but very subdued basin north of the really big one (whose name is Melanthius). They are not new discoveries.

Second, look at Penelope, the large crater in the middle of the disk. Very prominent in one image, invisible in the next (and well seen by Cassini). Why does it disappear? In the left-hand view the shading is albedo, not topographic shading. It just happens that the albedo and topographic shading cancel out in the right-hand view (think about how the sunlight falls on the crater walls). But also, see how Penelope falls on the border of a dark stripe, one of two on Tethys. Its pattern of light and dark is like the craters at the edge of Cassini Regio on Iapetus. Whatever explains Cassini Regio is presumably at work here. This is the best example, but not the only one, on Tethys.

Phil