Moon of Uranus
Oberon
The outermost major moon of Uranus, old and cratered.
Oberon is the outermost of Uranus's five major moons, taking 13.5 days per orbit. It is tidally locked to Uranus. Its heavily cratered surface has changed little over billions of years.
How it moves
- Oberon orbits Uranus every 13.463 days at about 583,500 km.
- Its orbit is nearly circular (eccentricity 0.0014) and close to Uranus's equator.
- It is tidally locked to Uranus.
- It follows Uranus's sideways equator, so it too orbits almost at right angles to the planets' plane.
Facts
- Mean radius
- 761.4 km
- Mass
- 2.880e+21 kg
- Surface gravity
- 0.354 m/s²
- Rotation period
- 323.118 hours
- Orbital period
- 13.463 days
- Average orbital distance
- 583,500 km
- Eccentricity
- 0.0014
- Discovered
- January 11, 1787, by William Herschel
Oberon has at least one large mountain rising about 6 km above its surface.
Sources: nssdc.gsfc.nasa.gov, ssd.jpl.nasa.gov, ssd.jpl.nasa.gov