Moon Data

(The second value represents the quantity as a fraction of the terrestrial value.)

Bulk parameters

Mass                          73.49e21 kg          12.30002e-3
GM                               4.9e3 km3/s2      0.0123
Equatorial radius                 1738 km          0.2725
Polar radius                      1735 km          0.2730
Flattening                       0.002             0.588
Mean density                      3340 kg/m3       0.6051
Moment of inertia coefficient    0.392             1.191
J2                            202.7e-6
Surface gravity                   1.62 m/s2        0.166
Escape velocity                   2.38 km/s        0.213
Topographic range                   25 km          1.250

Orbital parameters

Semimajor axis                 384 404 km
Sidereal period               27.32166 d
                            2.360591e6 s
Mean eccentricity               0.0549
Mean inclination to ecliptic     5.145 deg
Synodic period                 29.5306 d
Mean orbital velocity            1.023 km/s

Radiative properties

Bond albedo                      0.067             0.174
Visual geometric albedo           0.12             0.327
Visual magnitude V(1,0)          +0.21
Solar irradiance                  1380 W/m2        1.000
Black-body temperature           274.5 K           1.110

Spin properties

Obliquity                         6.68 deg
Sidereal rotation rate          13.176 deg/d
Sidereal rotation period        27.322 d