Monday, January 16, 2006


Mass (kg): 1.29 x 1022
Diameter (km): 2300
Mean density (kg/m3): 2030
Escape velocity (m/s): 1100
Average distance from Sun: 39.48 AU (5,906,376,200 km)
Rotation period (length of day in Earth days): 6.39 (retrograde)
Revolution period (length of year in Earth years): 247.92
Obliquity (tilt of axis degrees): 122.5
Orbit inclination (degrees): 17.15
Orbit eccentricity (deviation from circular): 0.248
Mean temperature (K): 37 (-236 oC)
Satellites: 1
Visual geometric albedo: (reflectivity) about 0.5
Atmospheric components: perhaps methane (CH4) and nitrogen (N)
Surface materials: perhaps methane ice


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