Oberon 

Discovered in 1787 by William Herschel, Oberon is a relatively "quiet" moon with little to no internal activity. The moon is old and heavily cratered with dark material of unknown origin at the basin. Other surface features include bright rayed craters and other icy reas of interest.

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.