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Prometheus


Prometheus is the third of Saturn's satellites. 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 in diameter. It has a number of ridges and valleys on its northern side. There are several craters about 20 kilometers in diameter, but it is less cratered than its nearby neighbors Pandora, Janus and Epimetheus. Prometheus is a porous, icy body with a low density.


Orbital Distance:   139,300 km (average)
Eccentricity:       0.003
Local Year:         0.613 days (14h 42m 43.2s)
Orbital Velocity:   16.532 km/s
Inclination:        0.000°
Local Day:          0.613 days (14h 42m 43.2s)
Axial Tilt:         n/a

Diameter:           145 km x 85 km x 62 km
Composition:        Ice
Density:            0.68 g/cm3
Mass:               2.7 x 1014 tonnes (45/billion earths)
Gravity:            0.0009 G
Escape Velocity:    0.028 km/s
Area:               26,000 km2
Surface Material:   Mostly H2O ice
Atmosphere:         None
Pressure:           None
Albedo:             0.60
Temperature:        ???°C

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