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Phobos
Phobos Moon

Moon of Mars: Phobos

Phobos is one of the two moons of planet Mars. Phobos is the larger innermost moon, and is thought to be a rubble pile held together by a dark thin crust. In 30 to 50 million years, it will either collide with Mars or break apart and become a ring system.

For a listing of other moons, see Moons of the Planets.

Phobos Facts
      1. Mass (kg)
      2. 1.08e+16
      1. Radius (km)
      2. 13.5 x 10.8 x 9.4
      1. Density (gm/cm3)
      2. 2.0
      1. Distance from planet (km)
      2. 9,380
      1. Rotational period (days)
      2. 0.31910
      1. Orbital period (days)
      2. 0.31910
      1. Orbital velocity (km/sec)
      2. 2.14
      1. Eccentricity of orbit
      2. 0.01
      1. Inclination of orbit (°)
      2. 1.0
      1. Albedo
      2. 0.06
      1. Magnitude (Vo)
      2. 11.3
      1. Atmosphere