Moon
Umbriel
TypeMoon
Mass1.275 × 10²¹ kg
Diameter1,169 km
Orbital Radius266,000 km
Orbital Period4.144 days
Rotation Period99.5 hours
Known Moons0
Surface Gravity0.23 m/s²
Average Temp-198 °C
AtmosphereNone
Discovered ByWilliam Lassell
Discovery Year1851
About Umbriel
The darkest of the five major Uranian moons, reflecting barely 16 percent of light. An ancient cratered surface broken by one striking bright feature, the ring-shaped Wunda.
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