UNIVERSE GUIDE

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Phobos

Moon Phobos
Planet Mars
Mass 10.6
Semi-Major Axis 9378
Sidereal Orbit Period 0.31891
Orbital Inclination 1.08
Orbital Eccentricity 0.0151
Mean Density 1900
Geometric Albedo 0.07
Visual Magnitude 11.8
Apparent Visual Magnitude 11.3
Data+Picture Copyright N.A.S.A.