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Pandora—One of Saturn's Shepherd Moon
Cassini's best close-up view of Saturn's F ring shepherd moon, Pandora, shows that this small ring-moon is coated in fine dust-sized icy material. Craters formed on this object by impacts appear to be covered by debris, a process that probably happens rapidly in a geologic sense. The grooves and small ridges on Pandora (84 kilometers, or 52 miles across) suggest that fractures affect the overlying smooth material.
Along with its companion moon Prometheus, Pandora helps shepherd icy particles into Saturn's F ring (see image below). Pandora is outside the ring.
