Epimetheus 

Epimetheus is the fifth satellite of Saturn and was discovered R. Walker in 1980. The surface presents many valleys and ridges in combination with different crustal deformations. Its heavily cratered surface shows that its surface is billions of years old.

Epimetheus has an orbit of 151,472 kilometers from Saturn's center, the same as Saturn's other moon Janus, and not more than 50 kilometers away from it. A very interesting fact is that Epimetheus and Janus swap orbits due to their close approach to each other once every four years. The momentum that is exchanged flings one inward and the other outward. The two moons may have once had once large parent.

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.