Moon of Uranus Diameter: 1158 km Distance: 190900 km (mean) Period: 2.52 days Eccentricity: 0.001 Inclination: 0.04° Magnitude: 13.7
Discovered in 1851, Ariel's surface appears to be the youngest and brightest of all the moons of Uranus. It has few large craters and many small ones and is transected by grabens, which are fault-bounded valleys. Ariel consist mostly of roughly equal amounts of water ice and silicate rock. Carbon dioxide has also been detected.