Prometheus 

Prometheus is the third satellite of Saturn and was discovered by S. Collins and others by analyzing photographs taken by the Voyager in 1980. Like Pandora, Prometheus is a shepherd satellite for the inner part of the F-ring. It also has numerous ridges and valleys with large craters, some up to 20 kilometers (12 miles) in diameter. Relative to its immediate neighbors, Prometheus has a much smoother surface and is much less dense.

Physical Data Key Mass Mass Mass Mass compared to that of Earth. Radius Radius Radius Radius compared to that of Earth. Mean Density Average Density. Distance Distance to the planet's center. Magnitude The brightness of a star or object.

Orbital Data Key Rotational Period Number of days to make one complete rotation. Orbital Period Number of days to obital the planet. Mean Orbital Velocity Average obital speed. Orbital Eccentricity Eccentricity. Orbital Inclination The tilt of the moon or planet. Escape Escape Velocity. Albedo Visual geometric albedo.