Pluto
Planet Profile
Mass (kg)............................................1.29 x 10^22
Diameter (km)........................................2300
Mean density (kg/m^3) ...............................2030
Escape velocity (m/sec)..............................1100
Average distance from Sun (AU).......................39.53
Rotation period (length of day in Earth days)........6.39
Revolution period (length of year in Earth years)....247.7
Obliquity (tilt of axis in degrees)..................122.5
Orbit inclination (degrees)..........................17.15
Orbit eccentricity (deviation from circular).........0.248
Mean temperature (K).................................37
Visual geometric albedo (reflectivity)...............about 0.5
Atmospheric components...............................perhaps
methane and
nitrogen
Surface materials....................................perhaps
methane ice
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