Although their gravitational effects on nearby ring material look quite different, Prometheus and Pan are both shepherd moons, holding back nearby ring edges in this image captured by NASA's Cassini spacecraft.
Saturn's small, potato-shaped moon Prometheus appears embedded within the planet's rings near the center of this view from NASA's Cassini spacecraft while the larger moon Mimas orbits beyond the rings.
Saturn's moon Prometheus casts a narrow shadow on the rings near the much larger shadow cast by the planet in this image taken by NASA's Cassini spacecraft about five months after Saturn's August 2009 equinox.
Saturn's small moon Prometheus, slightly overexposed in this image taken by NASA's Cassini spacecraft, shows off its potato-like shape as it orbits in the Roche Division between the A ring and thin F ring.
NASA's Cassini spacecraft captured Saturn's moon Prometheus, orbiting near the streamer-channels it has created in the thin F ring, casts a shadow on the A ring in this image taken a little more than a week after the planet's August 2009 equinox.