Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1439w&link_type=abstract
Lunar and Planetary Science, volume 27, page 1439
Physics
4
Dynamics, Moon, Rotation
Scientific paper
Analyses of Lunar Laser Ranging (LLR) observations of the Moon's three- dimensional rotation (physical librations) have generated claims of detectable amplitudes for two of the three modes of free physical librations. The modes are a 2.9 yr oscillation of the zero lunar longitude about the mean direction to the Earth and a 75 yr wobble of the pole direction which is analogous to the Earth's Chandler wobble. The claim for detectable signatures at the free libration periods is confirmed. There is a strong 75 yr signature, while the 2.9 yr amplitude is in the range of zero to 1.5". Dissipation in the Moon is also observed and the amplitude of the free modes should damp with time so their presence requires an active or recent stimulating mechanism.
Dickey Jean O.
Newhall X. X.
Williams James G.
Yoder Charles F.
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