Moon
Umbriel
The darkest of Uranus's major moons. A bright ring called "Wunda" sits at its pole.
| Type | Moon |
|---|---|
| Parent body | Uranus |
| Radius | 585 km · 0.0918 R⊕ |
| Mass | 1.275 × 10²¹ kg · 2.13 × 10⁻⁴ M⊕ |
| Mean density | 1.52 g/cm³ |
| Surface gravity | 0.249 m/s² · 0.025 × Earth |
| Escape velocity | 0.54 km/s |
| Rotation period | Tidally locked (always shows the same face) |
| Orbital radius | 266,000 km (Uranus) |
| Eccentricity | 0.004 |
| Orbital period | 4.14 days |