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| Discovery | |||||||
| Discovered by | William Lassell | ||||||
| Discovered in | 1851 | ||||||
| Orbital characteristics | |||||||
| Mean radius | 190,900 km | ||||||
| Perihelion | |||||||
| Aphelion | |||||||
| Eccentricity | |||||||
| Orbital period | 2.52 days | ||||||
| Inclination | ° | ||||||
| Satellite of | Uranus | ||||||
| Physical characteristics | |||||||
| Mean diameter | 1157.8 km | ||||||
| Surface areaThis article explains the meaning of area as a Physical quantity. Article area (geometry) is more mathematical. Area is a quantity expressing the size of a region of space. Surface area refers to the summation of the areas of the exposed sides of an objec | 4,200,000To 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 km2Square 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 | ||||||
| MassMass is a property of physical objects that, roughly speaking, measures the amount of matter they contain. It is a central concept of classical mechanics and related subjects. Strictly speaking, there are two different quantities called mass Inertial mass | kgThe kilogram (symbol: kg is the SI base unit of mass. A gram is defined as one thousandth of a kilogram. Conversion of units describes equivalent units of mass in other systems. Multiples SI prefixes are used to name multiples and subdivisions of the kilo | ||||||
| Mean densityFor other meanings of density, see density (disambiguation Density (symbol: rho Greek: rho) is a measure of mass per unit of volume. The higher an object's density, the higher its mass per volume. The average density of an object equals its total mass div | gFor other meanings of gram see gram (disambiguation). The gram (also spelt gramme is a unit of measurement of mass, and is defined in the SI system of units as one thousandth of a kilogram. See 1 E -3 kg for comparisons with other masses. The symbol for g/cm3 | ||||||
| Surface gravityThis article covers the physics of gravitation. See also gravity (disambiguation). Gravitation is the tendency of masses to move toward each other. The first mathematical formulation of the theory of gravitation was made by Sir Isaac Newton and proved ast | m/s2 | ||||||
| Escape velocity | km/s | ||||||
| Rotation period | 2.52 days | ||||||
| Axial tilt | ° | ||||||
| Albedo | |||||||
| Surface temperature |
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| Atmospheric pressure | 0 kPa | ||||||
Ariel ("AIR ee uhl") is a moon of Uranus discovered in 1851 by William Lassell. Ariel is named after the leading sylph in Alexander Pope's poem Rape of the Lock. It was discovered at the same time as Umbriel.
The name "Ariel" 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.