Moon of Uranus · Updated May 2026
Umbriel.
Umbriel is the darkest of Uranus's major moons, with the lowest reflectivity and the oldest, most heavily cratered surface among them. Its 1,169 km diameter and ancient terrain suggest it has been geologically dead for billions of years.
View Uranus system in 3D →Key facts
Umbriel's most prominent feature is a bright ring of frost at the bottom of the Wunda crater — incongruous against the otherwise uniformly dark surface, and unexplained.
About Umbriel
Umbriel was named after the dark spirit in Pope's Rape of the Lock. The dark surface is thought to be a primordial layer of carbon-bearing material covered with infall from impacts.
How to view Umbriel in 3D
Umbriel orbits Uranus in real time inside the interactive viewer. Open the parent body to see the orbital geometry, or use the object browser to fly directly to the moon and observe its rotation, surface, and orbit.
Open the Uranus system →Sources & methodology
Numbers cross-referenced with the sources below; updated May 2026.