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 Bulk Parameters | Orbital Parameters Observational Parameters | Atmospheric Parameters Satellites   Bulk Parameters Mass 0.6419 × 1024 kg Volume 16.318 × 1010 km3 Equatorial Radius 3397 km Polar Radius 3375 km Volumetric Mean Radius 3390 km Core Radius 1700 km Ellipticity 0.0065 Mean Density 3933 kg m-3 Surface Gravity 3.69 m s-2 Escape Velocity 5.03 km s-1 GM 0.04283 × 106 km3 s-2 Bond Albedo 0.16 Visual Geometric Albedo 0.150 Visual Magnitude -1.52 Solar Irradiance 595 W m-2 Black-Body Temperature 216.6 K Moment of Inertia 0.366 I MR-2 Topographic Range 36 km Orbital Parameters Semimajor Axis 227.9 × 106 km Sidereal Orbit Period 686.980 days Tropical Orbit Period 686.930 days Perihelion 206.6 × 106 km Aphelion 249.3 × 106 km Synodic Period 779.94 days Mean Orbital Velocity 24.13 km s-1 Orbital Inclination 1.85 ° Orbital Eccentricity 0.0934 Sidereal Rotation Period 24.6229 hours Obliquity to Orbit 25.19 ° Observational Parameters Maximum Apparent Diameter from Earth 25.7 arc seconds Minimum Apparent Diameter from Earth 3.5 arc seconds Maximum Distance from Earth 401.3 × 106 km Minimum Distance from Earth 54.5 × 106 km Apparent Magnitude near Opposition -2.0 Atmospheric Parameters Surface Pressure 6.9 mbars to 9 mbars Surface Density 0.020 kg m-3 Scale Height 11.1 km Average Temperature 210 K Diurnal Temperature Range 184 K to 242 K Surface Wind Speeds - Autumn 2 to 4 m s-1 Surface Wind Speeds - Summer 5 to 10 m s-1 Surface Wind Speeds - Dust Storm 17 to 30 m s-1 Mean Molecular Weight 43.34 g mol-1 Carbon Dioxide CO2 95.32% Nitrogen N2 2.7% Argon Ar 1.6% Oxygen O2 0.13% Carbon Monoxide CO 0.08% Water H2O 210 ppm Nitrogen Oside NO 100 ppm Neon Ne 2.5 ppm HDO 0.85 ppm Krypton Kr 0.3 ppm Xenon Xe 0.08 ppm Satellites Phobos Deimos   [ 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