Moon
The darkest of Uranus's major moons, heavily cratered and ancient.
| Type | Moon |
|---|---|
| Orbits | Uranus |
| Distance from parent body | 266,000 km |
| Diameter | 1,169 km |
| Mass | 1.27 × 10^21 kg |
| Surface gravity | 0.249 m/s² |
| Temperature | -213°C |
| Orbital period | 4 days |
| Apparent magnitude | 15.1 |
| Redshift | 0 |
| Discovered | 1851 |
At 1,169 km across, Umbriel is 34 percent of the diameter of Earth's Moon.
Its mass is less than a thousandth of the mass of Earth.
It orbits Uranus at 266,000 km, closer in than the Moon orbits Earth.
A single orbit takes 4.1 days.
An average temperature of 60 K works out at -213 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 1851.
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