Oberon

The outermost major moon of Uranus — heavily cratered and likely harboring a thin deep ocean.

Orbits Uranus

Second-largest Uranian moon; heavily cratered with dark crater floors.
A prominent ~11 km tall mountain rises near its limb (seen by Voyager 2).

About Oberon

Oberon is the second-largest moon of Uranus and its outermost major satellite. Voyager 2 imagery revealed a heavily cratered surface, unusual dark crater floors suggesting cryovolcanic resurfacing, and a striking 11 km mountain seen silhouetted against the limb. Like its sister moons, Oberon may host a thin deep water ocean produced by radiogenic heating.

Live · 3DSee Oberon in the Live 3D Solar SystemFly to Oberon and explore its orbit among the planets, moons & spacecraft in a full-screen interactive view.Launch 3D view

Physical Properties

Mean radius761 km

Mass3.076e21 kg

Density1.63 g/cm³

Surface gravity0.354 m/s²

Rotation period323.12 h

Bond albedo0.31

Mean temp61 K

Orbit

OrbitsUranus

Semi-major axis583,520 km

Eccentricity0.0014

Inclination0.068°

Orbital period13.463 d

Gallery

Hand-picked mission imagery of Oberon sourced from NASA and partner archives. Click any photo for full resolution and source attribution.

Oberon, the outermost large moon of Uranus, from Voyager 2. NASA/JPL-Caltech · Public Domain u2014 NASA Media Usage Guidelines

Imagery on this page is provided by the original mission teams. Full attribution terms: Image Rights & Credits.

Sources & Further Reading

Numerical values (radius, mass, orbital elements, temperatures) are drawn from NASA NSSDC Planetary Fact Sheets, JPL Horizons, and the JPL Small-Body Database. Last refreshed: 2026-06-08 01:37:02.