The solar system: the planets: planet Mars moons: Phobos

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Astronomy Magazine
< back to Planets Moon of Mars: Phobos

Planet Mars Moons: Phobos

Mars is the fourth of nine planets in our solar system.

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






Phobos Moon Facts
Mass (kg) 1.08e+16
Radius (km) 13.5 x 10.8 x 9.4
Density (gm/cm3) 2.0
Distance from Mars (km) 9,380
Period of rotation (days) 0.31910
Period of orbit (days) 0.31910
Orbital velocity (km/sec) 2.14
Eccentricity of orbit 0.01
Inclination of orbit (°) 1.0
surface gravity (m/sec2) 3.72
Escape velocity (km/sec) 0.0103
Visual albedo 0.06
Visual magnitude 11.3



This moon can be viewed in most telescopes.
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