Epimetheus is irregularly shaped and dotted with soft-edged craters. The many large, softened craters on Epimetheus indicate a surface that is several billion years old.
The moon shares an orbit with another of Saturn's small moons, Janus.
The two dance in a planetary tango as they move in almost identical orbits, exchanging orbits every four years, instead of colliding.
Both play a role in creating intricate waves in Saturn's rings; both have densities significantly lower than that of solid ice, suggesting they may be "rubble piles" held together by gravity.
At 116 kilometers (72 miles) across, Epimetheus is slightly smaller than Janus at 181 kilometers (113 miles) across.
Spectra of Epimetheus from the Cassini visual infrared mapping spectrometer indicate that the moon is mostly water ice.
The images for this false color composite were obtained with the Cassini spacecraft narrow angle camera on March 30, 2005, at a distance of approximately 74,600 kilometers (46,350 miles) from Epimetheus.
Cassini-Huygens at JPL
Cassini Imaging Team
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Cassini Finds Particles Near Saturn's Moon Enceladus
Pasadena CA (JPL) Apr 26, 2005
The Cassini spacecraft has discovered intriguing dust particles around Saturn's moon Enceladus. The particles might indicate the existence of a dust cloud around Enceladus, or they may have originated from Saturn's outermost ring, the E-ring.
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