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Saturn's Moon Prometheus
Saturn's moon Prometheus -- Prometheus [pra-MEE-thee-us] is the third of Saturn's known satellites. It was discovered from photographs taken by Voyager during its encounter with Saturn by S. Collins and others.
Prometheus acts as a shepherd satellite for the inner edge of Saturn's F Ring.
The moon is extremely elongated about 145 by 85 by 62 kilometers (90 by 53 by 39 miles) in diameter. It has a number of ridges and valleys on its northern side.
Several craters about 20 kilometers (12 miles) in diameter are visible, but it appears to be less cratered than its nearby neighbors Pandora, Janus and Epimetheus.
The density of Prometheus has been estimated to be quite low, indicating that is a porous, icy body; however, there is a lot of uncertainty in these values.
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Discovered by: S. A. Collins; D. Carlson/Voyager 1
Date of Discovery: 1980
Distance from Saturn: 139,353 km
Radius: 74.0�50.0�34.0 km
Orbital Eccentricity: 0.003
Orbital Inclination: 0.0 degree
Orbital Period: 0.6130 day
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NASA
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