At periapsis on 20 March 2006, Cassini snapped Mimas crossing Saturn's limb. The next day, it made a non-targeted fly-by of Rhea at a range of 82,000 kilometres. In addition to imaging the daylit hemisphere, it observed the hemisphere illuminated by 'Saturnshine' and gained the highest resolution view so far of this area. Since Rhea orbits just beyond the outer fringe of the 'E' ring, the Ultraviolet Imaging Spectrograph took measurements to investigate whether it was contributing material to the ring.
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