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Proteus
Moon
Proteus
Planet
Neptune
Mass
0.5
Semi-Major Axis
117.647
Sidereal Orbit Period
1.122315
Orbital Inclination
0.04
Orbital Eccentricity
0.0004
Geometric Albedo
0.1
Radius
220x208x202
Data+Picture Copyright
N.A.S.A.
