20. Phobos

20. Phobos

Courtesy of NASA/JPL-Caltech/University of Arizona

http://photojournal.jpl.nasa.gov/catalog/PIA10367


Moon of Mars

Diameter: 27x22x18 km
Orbit Radius: 9,380 km
Orbital Period: 0.3 days
Rotational Period: 0.3 days
Max/Min Temperature: -4°C/-112°C
Composition: Rocky
Atmospheric Pressure: 0 bars
Mass (Earth=1): 0.000000002
Magnetic Field: Unknown