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Solar System Exploration
Uranus: Facts & Figures
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Discovered By
William Herschel
Date of Discovery
13 March 1781
Orbit Size Around Sun (semi-major axis)
Metric: 2,870,658,186 km
English: 1,783,744,300 miles
Scientific Notation: 2.8706582 x 109 km (1.9189165 x 101 A.U.)
By Comparison: 19.189 x Earth
Perihelion (closest)
Metric: 2,734,998,229 km
English: 1,699,449,110 miles
Scientific Notation: 2.73500 x 109 km (1.828 x 101 A.U.)
By Comparison: 18.593 x Earth
Aphelion (farthest)
Metric: 3,006,318,143 km
English: 1,868,039,489 miles
Scientific Notation: 3.00632 x 109 km (2.010 x 101 A.U.)
By Comparison: 19.766 x Earth
Sidereal Orbit Period (Length of Year)
84.016846 Earth years
30,687.15 Earth days
By Comparison: 84.017 x Earth
Orbit Circumference
Metric: 18,026,802,831 km
English: 11,201,335,967 miles
Scientific Notation: 1.803 x 1010 km
By Comparison: 19.180 x Earth
Average Orbit Velocity
Metric: 24,477 km/h
English: 15,209 mph
Scientific Notation: 6.7991 x 103 m/s
By Comparison: 0.228 x Earth
Orbit Eccentricity
By Comparison: 2.828 x Earth
Orbit Inclination
0.77 degrees
Equatorial Inclination to Orbit
97.8 degrees (retrograde rotation) (retrograde rotation)
By Comparison: 4.173 x Earth
Mean Radius
Metric: 25,362 km
English: 15,759.2 miles
Scientific Notation: 2.5362 x 104 km
By Comparison: 3.9809 x Earth
Equatorial Circumference
Metric: 159,354.1 km
English: 99,018.1 miles
Scientific Notation: 1.59354 x 105 km
By Comparison: 3.9809 x Earth
Metric: 68,334,355,695,584 km3
Scientific Notation: 6.83344 x 1013 km3
By Comparison: 63.085 x Earth
Metric: 86,810,300,000,000,000,000,000,000 kg
Scientific Notation: 8.6810 x 1025 kg
By Comparison: 14.536 x Earth's
Metric: 1.270 g/cm3
By Comparison: 0.230 x Earth
Surface Area
Metric: 8,083,079,690 km2
English: 3,120,894,516 square miles
Scientific Notation: 8.0831 x 109 km2
By Comparison: 15.847 x Earth
Surface Gravity
Metric: 8.87 m/s2
English: 29.1 ft/s2
By Comparison: If you weigh 100 pounds on Earth, you would weigh 91 pounds on Uranus.
Escape Velocity
Metric: 76,968 km/h
English: 47,826 mph
Scientific Notation: 2.138 x 104 m/s
By Comparison: 1.911 x Earth
Sidereal Rotation Period (Length of Day)
-0.718 Earth days (retrograde)
-17.23992 hours (retrograde)
By Comparison: 0.72 x Earth
Effective Temperature
Metric: -216 °C
English: -357 °F
Scientific Notation: 57 K
Atmospheric Constituents
Hydrogen, Helium, Methane
Scientific Notation: H2, He, CH4
By Comparison: Earth's atmosphere consists mostly of N2 and O2.
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Last Updated: 28 Apr 2014