Planet Neptune

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Neptune

Planet Profile

Mass (kg)............................................1.02 x 10^26
Diameter (km)........................................49528
Mean density (kg/m^3) ...............................1640
Escape velocity (m/sec)..............................23300

Average distance from Sun (AU).......................30.06
Rotation period (length of day in Earth hours).......19.1
Revolution period (length of year in Earth years)....164.8

Obliquity (tilt of axis in degrees)..................29.6
Orbit inclination (degrees)..........................1.77
Orbit eccentricity (deviation from circular).........0.009

Mean temperature (K).................................48

Visual geometric  (reflectivity)...............0.51
Atmospheric components...............................74% hydrogen, 
                                                     25% helium,
                                                      1% methane (at depth)
Rings................................................Rings are 
                          narrow, and contain concentrations of 
                          particles called ring arcs

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