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Full Moon - January 27th, 2013 by © Sophie W. Smith

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Designations
Adjective lunar, selenic
Orbital characteristics
Perigee 362,570 km
(0.0024 AU)
Apogee 405,410 km
(0.0027 AU)
Semi-major axis 384,399 km
(0.00257 AU)1
Eccentricity 0.05491
Orbital period 27.321582 d (27 d 7 h 43.1 min1)
Synodic period 29.530589 d (29 d 12 h 44 min 2.9 s)
Average orbital speed 1.022 km/s
Inclination 5.145° to the ecliptic2 (between 18.29° and 28.58° to Earth’s 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 1,737.10 km (0.273 Earths)13
Equatorial radius 1,738.14 km (0.273 Earths)3
Polar radius 1,735.97 km (0.273 Earths)3
Flattening 0.00125
Circumference 10,921 km (equatorial)
Surface area 37,930,000 km2 (0.074 Earths)
Volume 2.1958 × 1010 km3 (0.020 Earths)
Mass 7.3477 × 1022 kg (0.0123 Earths1)
Mean density 3.3464 g/cm31
Equatorial surface gravity 1.622 m/s2 (0.165 4 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 0.1364
Surface temp. min mean max
equator 100 K 220 K 390 K
85°N5 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 arcminutes3[b]
Atmosphere6
Surface pressure 10−7 Pa (day)
10−10 Pa (night)©
Composition Ar, He, Na, K, H, Rn
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Tags

full, moon, luna, selene, earth, natural, satellite, solar, system, mona, lunar, january, evening, sophie, smith, long, middle, island, ny, night, dark, sky, moonlight

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