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Umbriel is a moon of Uranus and the third most massive of the Uranian moons. Discovered on October 24, 1851, by William Lassell, it is one of the darker moons of Uranus, with a low reflectivity indicating a surface covered in carbonaceous material.
Key Facts
- Orbital Period: About 4.1 Earth days
- Diameter: Approximately 1,170 km
- Surface: Characterized by heavily cratered terrain, ancient and dark
- Average Distance from Uranus: About 266,000 km
- Orbital Speed: Approximately 4.67 km/s
Surface and Composition
Umbriel's surface is marked by numerous impact craters and has a much darker and older surface compared to other moons. It appears to be composed primarily of water ice with a significant amount of darker, rocky material.
Interesting Facts
- Umbriel is named after a character in Alexander Pope’s poem "The Rape of the Lock."
- This moon remains one of the least understood in the Uranian system, with no dedicated missions to study it up close.
- The largest crater on Umbriel, Wunda, has a mysterious bright ring of material on its floor, which contrasts sharply with the rest of the moon's dark surface.
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