Sponsored by the Institute of Physics   Planets   Mercury   Venus   Earth   Mars     Phobos     Deimos   Jupiter   Saturn   Uranus   Neptune   Pluto Asteroids Comets Constellations Sunrise and Sunset Times Moon Phases SI Units Symbols   Printer Version Astronomy Planets - Mars - Phobos Bulk Parameters Orbital Parameters Bulk Parameters Mass 10.8 × 1015 kg Major Axis Radius 13 km Minor Axis Radius 9 km Mean Density 1 900 kg m-3 Geometric Albedo 0.06 Visual Magnitude +11.8 Orbital Parameters Mean Distance from Mars 9 377 km Sidereal Orbit Period 0.318 91 days Orbital Inclination 1.08 ° Orbital Eccentricity 0.0151   [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] Download | Shop | Contact | About   Page compiled: Wed Sep 05 18:37:58 GMT+01:00 2001