Monday, January 16, 2006


Mass (kg): 8.68 x 1025
Diameter (km): 51118
Mean density (kg/m3): 1290
Escape velocity (m/s): 21300
Average distance from Sun: 19.19 AU (2,870,972,200 km)
Rotation period (length of day in Earth days): 0.72 (17.9 Earth hours)(retrograde)
Revolution period (length of year in Earth days): 30,685 (84 Earth years)
Obliquity (tilt of axis degrees): 97.9
Orbit inclination (degrees): 0.77
Orbit eccentricity (deviation from circular): 0.047
Mean temperature (K): 59 (-214 oC)
Satellites: 27
Visual geometric albedo: (reflectivity) 0.56
Atmospheric components: 83% hydrogen (H), 15% helium (He), 2% methane (at depth) (CH4)
Rings: Uranus has a system of narrow, faint rings. Rings particles are dark, and could consist of rocky or carbonaceous material.


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