The Moon  
Full Moon as seen from Earth's northern hemisphere
Designations
Adjective lunar, selenic
Orbital characteristics
Perigee 362,570 km (0.0024 AU)
(356,400–370,400 km)
Apogee 405,410 km (0.0027 AU)
(404,000–406,700 km)
Semi-major axis 384,399 km (0.00257 AU)
Eccentricity 0.0549
Orbital period 27.321582 d (27 d 7 h 43.1 min)
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 ecliptic
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)
Equatorial radius 1,738.14 km (0.273 Earths)
Polar radius 1,735.97 km  (0.273 Earths)
Flattening 0.00125
Circumference 10,921 km (equatorial)
Surface area 3.793 × 107 km2  (0.074 Earths)
Volume 2.1958 × 1010km3  (0.020 Earths)
Mass 7.3477 × 10)
Mean density 3.3464 g/cm
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)
Albedo 0.136
Surface temp.
   equator
   85°N
min mean max
100 K 220 K 390 K
70 K 130 K 230 K
Apparent magnitude −2.5 to −12.9
−12.74 (mean full Moon)
Angular diameter 29.3 to 34.1 arcminutes
Atmosphere
Surface pressure 10−7Pa (day)
10−10 Pa (night)
Composition Ar, He, Na, K, H, Rn

Get more info about Moon in Wikipedia

This article uses material from the Wikipedia article
Moon, which is released under the Creative Commons Attribution-Share-Alike License 3.0