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Umbriel ("UM bree uhl") is a moon of Uranus discovered in 1851 by William Lassell. It was discovered at the same time as Ariel.The name "Umbriel" and the names of all four satellites of Uranus then known were suggested by John Herschel in 1852 at the request of Lassell[1]. Lassell had earlier endorsed Herschel's 1847 naming scheme for the seven then-known satellites of Saturn and had named his newly-discovered eighth satellite Hyperion in accordance with Herschel's naming scheme in 1848.
1 Physical characteristics
Umbriel's surface is the darkest of the Uranian moons, and it is also the least geologically active. It is mostly composed of water ice, with the balance made up of silicate rock and methane ice. Most of its methane ice is on its surface. Coincidentally, Umbriel's dark colour suits its name: Umbriel is the 'dusky melancholy sprite' in Alexander Pope's The Rape of the Lock, and the name suggests the Latin umbra, shadow.
Umbriel's most prominent feature is WundaWunda is a large ring of bright material on the surface of Uranus's moon Umbriel. It is a crater of some kind, but the reason for its brightness, which stands out from the very dark composition of the moon as a whole, is unknown. It is named after Wunda,, a large ring of bright material (see picture). Wunda is presumably some kind of craterThis article is about impact craters. For volcanic craters, see Caldera. For the constellation, see Crater (constellation). A crater basin or impact crater is a circular depression on the surface of a planet, moon, asteroid, or other celestial body. Crate, but its exact nature is mysterious.
See also: List of craters on UmbrielThis is a list of named craters on Umbriel . Umbrielian craters are named after evil spirits in various mythologies. External links Uranus' moons Craters Umbriel.
Data for Umbriel:
- Mean Diameter: 1169.4To help compare different orders of magnitude this page lists lengths between 106 and 107 m (1,000 and 10,000 km). See also lengths of other orders of magnitude. Distances shorter than 106 m 1,000 km is equal to: 621 miles. Side of square with area 1,000, kmA kilometre ( American spelling: kilometer (symbol: km is a unit of length equal to 1000 metres. It is approximately equal to 0. 621 miles, 1094 yards or 3281 feet. Slang terms for kilometre include " klick" (or "click") and "kay". Click" is also used for
- Surface Area: 4,300,000To help compare orders of magnitude of different surface areas, here is a list of areas between 1 million kmē and 10 million kmē. See also areas of other orders of magnitude. Areas smaller than 1 million kmē 1,000,000 kmē is equal to: 386,000 square miles kmēSquare kilometre (symbol km is an SI unit of surface area. It is one of the SI derived units. 1 kmē is equal to: the area of a square measuring 1 kilometre on each side 1 000 000 mē 100 hectares 0. 386 102 square miles (statute) 247. 105 381 acres Convers
- Orbital radius: 266,000 kmTo help compare different orders of magnitude, this page lists lengths starting at 108 m (100,000 km). See also lengths of other orders of magnitude. Distances shorter than 108 m 111,191 km 20,000 (nautical, British) leagues (see Jules Verne) 120,000 km D
- Rotation period: 4.14 days
- Orbital period: 4.14 days
2 External links
Uranus' moons
