Umbriel
Moon
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Umbriel is the third-largest moon of Uranus. It was discovered on October 24, 1851, by William Lassell. It was discovered at the same time as Ariel and named after a character in Alexander Pope's 1712 poem The Rape of the Lock. Wikipedia
Radius: 363.32 mi
Discoverer: William Lassell
Discovered: October 24, 1851
Gravity: 0.2 m/s²
Albedo: : 0.26 (geometrical); 0.10 (Bond);
Average orbital speed: 4.67 km/s (calculated)
Axial tilt: 0