Moon
Ariel
TypeMoon
Mass1.235 × 10²¹ kg
Diameter1,158 km
Orbital Radius190,900 km
Orbital Period2.52 days
Rotation Period60.5 hours
Known Moons0
Surface Gravity0.27 m/s²
Average Temp-213 °C
AtmosphereNone (CO2 possible)
Discovered ByWilliam Lassell
Discovery Year1851
About Ariel
The brightest Uranian moon, with the youngest surface of the group. Deep rift valleys flooded by ancient icy lava cut across its plains. Voyager 2 imaged it best in January 1986. May hide a salty ocean like other large icy moons.
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