Moon of Uranus
Umbriel
Umbriel is a moon. It orbits Uranus. It is about 1,169 km across – smaller than our Moon. Umbriel is the darkest of Uranus's large moons.
Fact file
- Type
- Moon of Uranus
- Diameter
- 1,169 km
- Distance from Uranus
- 266,000 km
- Orbital period
- 4.1 days
- Temperature
- -198 °C on average
Umbriel orbits Uranus.
Interesting facts about Umbriel
- Umbriel is the darkest of Uranus's large moons.
- At the equator shines a mysterious bright ring: the floor of the 131 km wide crater Wunda.
- The name comes from Alexander Pope's poem “The Rape of the Lock” – a melancholy spirit.
Frequently asked questions about Umbriel
How big is Umbriel?
Umbriel has a diameter of 1,169 km. That is about 34% of the diameter of our Moon.
How far is Umbriel from Uranus?
Umbriel orbits Uranus at an average distance of 266,000 km.
How long does Umbriel take to orbit Uranus?
Umbriel orbits Uranus once every 4.1 days.
How cold or warm is it on Umbriel?
On Umbriel the average temperature is −198 °C.
Formation
Its old, heavily cratered surface has hardly changed in billions of years.
Atmosphere
No atmosphere.
Exploration
Discovered in 1851 by William Lassell, photographed in 1986 by Voyager 2.
Compared with Earth
About a third the size of our Moon.
Other moons of Uranus
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