Umbriel ("UM bree el") is the thirteenth of Uranus's known satellites and the third largest:Pope's The Rape of the Lock.
Discovered by Lassell in 1851.
Umbriel and Oberon appear quite similar though Oberon is 35% larger. All of Uranus' large moons are a mixture of about 40-50% water ice with the rest rock, a somewhat larger fraction of rock than Saturn's large moons such as Rhea.
Umbriel is very dark; it reflects only about half as much light as Ariel, Uranus' brightest satellite.
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Bill Arnett; last updated: 2004 Dec 11