Uranus Statistics
 Discovered byWilliam Herschel 
 Date of discovery1781 
 Mass (kg)8.686e+25 
 Mass (Earth = 1)1.4535e+01 
 Equatorial radius (km)25,559 
 Equatorial radius (Earth = 1)4.0074 
 Mean density (gm/cm^3)1.29 
 Mean distance from the Sun (km)2,870,990,000 
 Mean distance from the Sun (Earth = 1)19.1914 
 Rotational period (hours)-17.9 
 Orbital period (years)84.01 
 Mean orbital velocity (km/sec)6.81 
 Orbital eccentricity0.0461 
 Tilt of axis (degrees)97.86 
 Orbital inclination (degrees)0.774 
 Equatorial surface gravity (m/sec^2)7.77 
 Equatorial escape velocity (km/sec)21.30 
 Visual geometric albedo0.51 
 Magnitude (Vo)5.52 
 Mean cloud temperature-193°C 
 Atmospheric pressure (bars)1.2 
 Atmospheric composition
Hydrogen
Helium
Methane

83% 
15% 
2% 

Ring Statistics
NameDistance*WidthThicknessMassAlbedo
 1986U2R 38,000 km 2,500 km 0.1 km ? 0.03
 6 41,840 km 1-3 km 0.1 km ? 0.03
 5 42,230 km 2-3 km 0.1 km ? 0.03
 4 42,580 km 2-3 km 0.1 km ? 0.03
 Alpha 44,720 km 7-12 km 0.1 km ? 0.03
 Beta 45,670 km 7-12 km 0.1 km ? 0.03
 Eta 47,190 km 0-2 km 0.1 km ? 0.03
 Gamma 47,630 km 1-4 km 0.1 km ? 0.03
 Delta 48,290 km 3-9 km 0.1 km ? 0.03
 1986U1R 50,020 km 1-2 km 0.1 km ? 0.03
 Epsilon 51,140 km 20-100 km < 0.15 km ? 0.03

*The distance is measured from the planet center to the start of the ring.

Moon Statistics
Moon#Radius
(km)		Mass
(kg)		Distance
(km)		DiscovererDate
 CordeliaVI13?49,750Voyager 21986
 OpheliaVII16?53,760Voyager 21986
 BiancaVIII22?59,160Voyager 21986
 CressidaIX33?61,770Voyager 21986
 DesdemonaX29?62,660Voyager 21986
 JulietXI42?64,360Voyager 21986
 PortiaXII55?66,100Voyager 21986
 RosalindXIII27?69,930Voyager 21986
 BelindaXIV34?75,260Voyager 21986
 PuckXV77?86,010Voyager 21985
 MirandaV235.86.33e+19129,780G. Kuiper1948
 ArielI578.91.27e+21191,240W. Lassell1851
 UmbrielII584.71.27e+21265,970W. Lassell1851
 TitaniaIII788.93.49e+21435,840W. Herschel1787
 OberonIV761.43.03e+21582,600W. Herschel1787

Uranus Data Aquired From Views of the Solar System
by Calvin J. Hamilton

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