Image: Wikimedia Commons

Umbriel

Moon of Uranus

Also known as Uranus II · Umbriel (moon)

Orbits: Uranus
Mass: 1.1717 yottagram
1
Sources
1.ui.adsabs.harvard.edu/abs/1992AJ....103.2068JRetrieved 2020-09-05
View statement on Wikidata ↗
Radius: 584.7 km
1
Sources
1.Stated in NASA FACTSssd.jpl.nasa.gov/?sat_phys_par
View statement on Wikidata ↗
Orbital period: 4.144 days
Semi-major axis: 266,300 km
Discovered by: William Lassell
Discovered: October 24, 1851

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

Umbriel is the third-largest moon of Uranus. It was discovered on October 24, 1851, by William Lassell at the same time as neighboring moon Ariel. It was named after a character in Alexander Pope's 1712 poem The Rape of the Lock. Umbriel consists mainly of ice with a substantial fraction of rock, and may be differentiated into a rocky core and an icy mantle. The surface is the darkest among Uranian moons and appears to have been shaped primarily by impacts; however, the presence of canyons suggests early internal processes. The moon may have undergone an early endogenically driven resurfacing event that obliterated its older surface.

Overview

All data

39 statements · 15% with external sources · numbers in brackets are citations

Apparent magnitude: 14.5 astronomical filter: V band
Named after: Umbriel
Eccentricity: 0.0039
Density: 1.39 g/cm³
Albedo: 0.26
Inclination: 0.128 degree
Diameter: 1,169.4 km
1
Sources
1.Stated in Radii, shapes, and topography of the satellites of Uranus from limb coordinates
View statement on Wikidata ↗
Provisional designation: Uranus II
Periapsis: 264,949 km
Apoapsis: 267,023 km

On other databases

16 identifiers linking Umbriel across the web's reference databases

Data quality

statements

15%

externally sourced

Source last edited October 12, 2026. AIDB refreshes this page daily.

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AIDB. (2026). Umbriel (Q3338). Retrieved from https://aidb.si/e/umbriel-Q3338