PLANETARY DATA: MOON

Orbital semi-major axis* 384,000 km
Orbital eccentricity 0.055
Perigee** 363,000 km
Apogee*** 406,000 km
Mean orbital speed 1.02 km/s
Sidereal orbital period 27.3 solar days
Synodic orbital period 29.5 solar days
Orbital inclination to the ecliptic 5.2°
Greatest angular diameter, as seen from Earth 32.9'
Mass 7.351022 kg
0.012 (Earth = 1)
Equatorial radius 1738 km
0.27 (Earth = 1)
Mean density 3340 kg/m3
0.61 (Earth = 1)
Surface gravity 1.62 m/s2
0.17 (Earth =5 1)
Escape speed 2.38 km/s
Sidereal rotation period 27.3 solar days
Axial tilt 6.7°
Surface magnetic field (no detectable field)
Surface temperature 100—400 K
*Closest approach to Earth

**Orbit around Earth

***Greatest distance from Earth