Known Space -- Sol -- Uranus -- | Oberon |
Oberon is the fifteenth of Uranus's satellites and second largest. Oberon and Umbriel appear quite similar though Oberon is 35% larger. All of Uranus' large moons are a mixture of about 40-50% water ice with the rest rock, a somewhat larger fraction of rock than Saturn's large moons such as Rhea.
Oberon's heavily cratered surface has probably been stable since its formation. It has far more and larger craters than do Ariel and Titania. Some of the craters have rays of ejecta similar to those seen on Callisto.
Some of the crater floors are dark, covered with darker material (dirty water) that upwelled into the crater. Large faults are also seen across the entire southern hemisphere of Oberon. This indicates some geologic activity early in Oberon's history.
Orbital Distance: 583,000 km - 583,900 km (average 583,400 km) Eccentricity: 0.0008 Local Year: 13.463 days (13d 11h 7m 4s) Orbital Velocity: 3.151 km/s Inclination: 0.10° Local Day: 13.463 days (13d 11h 7m 4s) Axial Tilt: n/a Diameter: 1,522 km Composition: H2O ice and rock Density: 1.64 g/cm3 Mass: 3.03 x 1018 tonnes (0.0005 earths) Gravity: 0.036 G Escape Velocity: 0.729 km/s Area: 7.3 million km2 Surface Material: H2O ice and rock Atmosphere: None Pressure: None Albedo: 0.24 Temperature: ???°C |