Mars Statistics Mass (kg)6.421e+23 Mass (Earth = 1)1.0745e-01 Equatorial radius (km)3,397.2 Equatorial radius (Earth = 1)5.3264e-01 Mean density (gm/cm^3)3.94 Mean distance from the Sun (km)227,940,000 Mean distance from the Sun (Earth = 1)1.5237 Rotational period (hours)24.6229 Rotational period (days)1.025957 Orbital period (days)686.98 Mean orbital velocity (km/sec)24.13 Orbital eccentricity0.0934 Tilt of axis (degrees)25.19 Orbital inclination (degrees)1.850 Equatorial surface gravity (m/sec^2)3.72 Equatorial escape velocity (km/sec)5.02 Visual geometric albedo0.15 Magnitude (Vo)-2.01 Minimum surface temperature-140°C Mean surface temperature-63°C Maximum surface temperature20°C Atmospheric pressure (bars)0.007 Atmospheric composition Carbon Dioxide (C02)Nitrogen (N2)Argon (Ar) Oxygen (O2)Carbon Monoxide (CO)Water (H2O)Neon (Ne) Krypton (Kr)Xenon (Xe)Ozone (O3) 95.32% 2.7% 1.6% 0.13% 0.07% 0.03% 0.00025% 0.00003% 0.000008% 0.000003%