MoonMoon
Moon Fact SheetMoon/Earth Comparison Bulk parametersMoon Earth Ratio (Moon/Earth) Mass (1024 kg) 0.07349 5.9736 0.0123 Volume (1010 km3) 2.1973 108.321 0.0203 Equatorial radius (km) 1738 6378 0.2725 Polar radius (km) 1735 6356 0.2730 Volumetric mean radius (km) 1737.5 6371 0.2727 Ellipticity 0.002 0.0034 0.588 Mean density (kg/m3) 3340 5520 0.6051 Surface gravity (m/s2) 1.62 9.78 0.166 Escape velocity (km/s) 2.38 11.2 0.213 GM (x 106 km3/s2) 0.0049 0.3986 0.0123 Bond albedo 0.067 0.385 0.174 Visual geometric albedo 0.12 0.367 0.327 Visual magnitude V(1,0) +0.21 -3.86 - Solar irradiance (W/m2) 1380 1380 1.000 Black-body temperature (K) 274.5 247.3 1.110 Topographic range (km) 16 20 0.800 Moment of inertia (I/MR2) 0.394 0.3308 1.191 Orbital parameters (for orbit about the Earth)Moon Semimajor axis (106 km) 0.3844 Perigee (106 km) 0.3633 Apogee (106 km) 0.4055 Revolution period (days) 27.322 Synodic period (days) 29.53 Mean orbital velocity (km/s) 1.023 Orbit inclination (deg) 5.145 Orbit eccentricity 0.0549 Sidereal rotation period (hrs) 655.728 Equatorial inclination (deg) 6.68 Recession rate from Earth (cm/yr) 3.8 For information on the Earth, see the Earth Fact Sheet . NASA Official: J. H. King,
joseph.h.king@gsfc.nasa.gov
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