Key facts
- Scale fact
- 1,170 kmdiameter
- Composition
- Water ice and silicate rock
Umbriel
1,170 kmdiameter
Details
Umbriel is the darkest of Uranus' large moons, an ancient cratered world that reflects only a small fraction of the sunlight that reaches it. Voyager 2 also revealed the bright Wunda ring on its dark surface, a feature whose origin remains uncertain.
Voyager 2 found Umbriel heavily cratered and darker than Uranus’s other major moons. The most conspicuous exception is a bright ring associated with Wunda crater. Frost or exposed ice could explain the contrast, but the limited images do not establish the deposit’s origin; newer interior models likewise predict, rather than observe, a possible buried ocean.
Links
- Universe journey
- Solar System
- Wikipedia
- Umbriel on Wikipedia
Size neighbors
Objects near Umbriel on the scale
Sources
References for Umbriel
Measurements and descriptive context are compiled by the Scale of Space team from the references below. If you find an error, please let us know.
- Umbriel — Wikipedia
- Visual reference: Wikimedia Commons (Voyager 2 1986 / NASA / Jet Propulsion Lab, Public domain)
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About
Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.
Guides explain selected parts of that range, while focused views filter the objects by subject.