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Solar System Exploration
Ariel: Facts & Figures
   Back to Uranus   Overview   Gallery   Facts & Figures   News 
Discovered By
William Lassell
Date of Discovery
24 October 1851
Orbit Size Around Uranus (semi-major axis)
Metric: 190,900 km
English: 118,620 miles
Scientific Notation: 1.909 x 105 km (1.276 x 10-3 A.U.)
Periapsis (closest)
Metric: 190,671 km
Apoapsis (farthest)
Metric: 191,129 km
Sidereal Orbit Period (Length of Year)
0.006899384 Earth years
2.52 Earth days
Orbit Circumference
Metric: 1,199,459.64 km
Average Orbit Velocity
Metric: 19,832.3 km/h
Orbit Eccentricity
Orbit Inclination
0.041 degree
Mean Radius
Metric: 578.9 km
English: 359.7 miles
Scientific Notation: 5.789 x 102 km
Equatorial Circumference
Metric: 3,637.3 km
Metric: 812,641,988 km3
Metric: 1,294,849,526,195,970,000,000 kg
Scientific Notation: 1.2948 x 1021 kg
Metric: 1.592 g/cm3
Surface Area
Metric: 4,211,307.59 km2
Surface Gravity
Metric: 0.258 m/s2
Escape Velocity
Metric: 1,967 km/h
Rotation Period (Length of Day)
By Comparison: Synchronous with Uranus

Additional Information:

-USGS Astrogeology: Gazetteer of Planetary Nomenclature:

-JPL Solar System Dynamics:

-"Encyclopedia of the Solar System," second edition, edited by Lucy-Ann McFadden, Paul R. Weissman, and Torrence V. Johnson; Academic Press 2007

-United States Geological Survey: Ariel:

-Dr. Ellis Miner, retired planetary scientist, Jet Propulsion Laboratory
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Last Updated: 4 Mar 2011