Lunar moments, tides, orientation, and coordinate frames
Abstract
To determine the lunar moments of inertia ( A < B < C) it is necessary to determine three quantities. (C  A)/B and (B  A)/C come from Lunar Laser Ranging (LLR) measurement of the lunar orientation Spacecraft or lunar orbit perturbations provide J_{2} Combining five reported J_{2} results gives a normalized polar moment of inertia C/MR ^{2} = 0.3929 ± 0.0009 Solidbody tides displace the surface about 0.1 m, but can perturb the orbit of a Moonorbiting spacecraft. The selenocentric coordinates of four lunar retroreflectors are accurately known and can serve as reference points. The orientation and orbit of the Moon are very well known for the time span of the LLR data.
 Publication:

Planetary and Space Science
 Pub Date:
 October 1996
 DOI:
 10.1016/00320633(95)001549
 Bibcode:
 1996P&SS...44.1077W