Reference image
Object guide
Umbriel is a dark, heavily cratered moon of Uranus with fewer signs of geologic resurfacing than some of its siblings. Umbriel is approximately 1,169.4 km across.
How to observe Umbriel
Umbriel is resolved as a separate world mainly through imaging or spacecraft data; visually, its relationship to uranus is the key observing context.
Scientific context
Useful scale comparisons are 0.092 Earth diameters, 0.019 g surface gravity, 0.011 Earth years per orbit. These values are rounded from the catalogue measurements shown on this page.
- Radius
- 584.7 km
- Diameter
- 1,169.4 km
- Mass
- 1,270,000,000,000,000,000,000 kg
- Mean density
- 1.517 g/cm³
- Surface gravity
- 0.19 m/s² (0.019 g)
- Orbital period
- 4.144 days (0.011 years)
- Parent body
- uranus
0.092 Earth diameters0.019 g surface gravity0.011 Earth years per orbit
Source: NASA Science (checked 2026-08-09). Values are rounded catalogue measurements.
Interactive orbit model
Aug 13, 2026, 22:251×
Calculated positions / separate exploration scales