Full moon as seen from Earths northern hemisphere Designations Adjective lunar, selenic Orbital characteristics Perigee 363295 km (0.0024 AU) Apogee 405503 km (0.0027 AU) Semi-major axis 384399 km (0.00257 AU)[1] Eccentricity 0.0549[1] Orbital period 27.321582 d (27d 7h 43.1min[1]) Synodic period 29.530589 d (29d 12h 44min 2.9s) Average orbital speed 1.022 km/s Inclination 5.145° to the ecliptic[2] (between 18.29° and 28.58° to Earths equator)[1] Longitude of ascending node regressing by one revolution in 18.6 years Argument of perigee progressing by one revolution in 8.85 years Satellite of Earth Physical characteristics Mean radius 1737.10 km (0.273 Earths)[1][3] Equatorial radius 1738.14 km (0.273 Earths)[3] Polar radius 1735.97 km (0.273 Earths)[3] Flattening 0.00125 Circumference 10921 km (equatorial) Surface area 3.793×107 km2 (0.074 Earths) Volume 2.1958×1010 km3 (0.020 Earths) Mass 7.3477×1022 kg (0.012300 Earths[1]) Mean density 3.3464 g/cm3[1] Equatorial surface gravity 1.622 m/s2 (0.1654 g) Escape velocity 2.38 km/s Sidereal rotation period 27.321582 d (synchronous) Equatorial rotation velocity 4.627 m/s Axial tilt 1.5424° (to ecliptic) 6.687° (to orbit plane)[2] Albedo 0.136[4] Surface temp. min mean max equator 100 K 220 K 390 K 85°N[5] 70 K 130 K 230 K Apparent magnitude −2.5 to −12.9[a] −12.74 (mean full moon)[3] Angular diameter 29.3 to 34.1 arcminutes[3][b] Atmosphere[6] Surface pressure 10−7 Pa (day) 10−10 Pa (night)[c] Composition Ar, He, Na, K, H, Rn
Posted on: Tue, 11 Mar 2014 02:21:36 +0000
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