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.