Bruce Murray Space Image Library
Dances with Moons
Cassini captures "mutual event" movies to refine the precision with which we know the orbits of Saturn's moons. On 17 September 2011, Cassini took four such movies in rapid succession: Tethys with Titan at about 0100 UTC; Rhea with Titan at 0130; Enceladus with Titan at about 1030; and, at the end, at 1200, a movie with Titan, Dione, Saturn's rings, Pandora, and Pan.