Cassini is playing back pictures from Phoebe. The moon overall is characterized by very sheer impact craters that look as though someone carved them out with ice-cream scoopers. Perhaps all of the other outer planet moons look like this, but this is the closest pass yet to any outer planet small icy satellite. (Voyager 2's pass by Miranda was the previous closest.). See these closeups: an image of the limb and a closeup of a single crater with fascinating regolith detail.