Moon of Uranus · Updated October 2026
Oberon.
Oberon is the second-largest moon of Uranus at 1,523 km diameter and the outermost of its major moons. Its ancient surface is heavily cratered, with mysterious dark patches on some crater floors and a 6 km-tall mountain near the limb in the only Voyager 2 close-up.
View Uranus system in 3D →Key facts
Oberon's leading hemisphere is redder than its trailing one, as Titania's is, possibly from dust that spirals in from Uranus's small outer moons and settles on the side facing forward.
About Oberon
Named after the king of the fairies in A Midsummer Night's Dream. The dark crater floors may be primordial carbon-rich material exposed by impacts.
How to view Oberon in 3D
Oberon orbits Uranus in real time inside the interactive viewer. Open the parent body to see the orbital geometry, or use the object browser to fly directly to the moon and observe its rotation, surface, and orbit.
Open the Uranus system →More about Uranus
Sources & methodology
Numbers cross-referenced with the sources below; updated October 2026.