# Oberon (GIF, 167K)

Uranus IV

Oberon [O-buh-ron] is a moon of Uranus that is characterized by an old, heavily cratered, and icy surface. The surface shows little evidence of internal activity other than some unknown dark material that apparently covers the floors of many craters. The above image shows several large impact craters towards the center of the image. On the limb, a high mountain rises 6 kilometers (4 miles) above its surroundings. There are bright rays similar to those seen on Jupiter's moon Callisto.

## Oberon Statistics

    Discovered by .............................. William Herschel
    Date of discovery ...................................... 1787

    Mass (kg) .......................................... 3.03e+21
    Mass (Earth = 1) ................................. 5.0703e-04
    Equatorial radius (km) ................................ 761.4
    Equatorial radius (Earth = 1) .................... 1.1938e-01
    Mean density (gm/cm^3) ................................. 1.64

    Mean distance from Uranus (km) ...................... 582,600
    Rotational period (days) ........................... 13.46324
    Orbital period (days) .............................. 13.46324
    Mean orbital velocity (km/sec) ......................... 3.15

    Orbital eccentricity ................................. 0.0008
    Orbital inclination .................................... 0.10°

    Escape velocity (km/sec) .............................. 0.729

    Visual geometric albedo ................................ 0.24
    Magnitude (Vo) ........................................ 13.94

Uranus Titania

##### Author: Calvin J. Hamilton.