Umbriel

Umbriel is classified among the natural satellites of Uranus.[1]

History

William Lassell discovered Umbriel on October 24, 1851.[1] The name Umbriel honors a villainous spirit created by poet Alexander Pope.[1]

Findings

Umbriel reflects about 16 percent of incident light, less than any other major moon orbiting Uranus.[1] Voyager 2 captured views in 1986 that revealed dense impact scarring across the south of Umbriel.[1] NASA puts Umbriel's diameter at about 1,200 kilometres.[1] JPL lists Umbriel's mean radius as 584.7 kilometres.[2] NASA says the cause of the dark ancient surface on Umbriel remains unknown.[1] USGS lists craters among the mapped feature types on Umbriel.[3]

Sources

  1. Umbriel | NASA Science. Licence: US federal work, public domain (17 USC 105). Attribution: NASA.
  2. Physical Parameters of Natural Satellites | NASA/JPL. Licence: facts-only (Track B), no text reused. Attribution: NASA/JPL-Caltech.
  3. Umbriel target | USGS Gazetteer of Planetary Nomenclature. Licence: US federal work, public domain (17 USC 105). Attribution: U.S. Geological Survey.

Evidence as of 2026-11-01.