Estimation of the Lunar Physical Librations

Authors: Newhall, X.X.; Williams, J.G.

Source: Celestial Mechanics and Dynamical Astronomy, Volume 66, Number 1, 1996 , pp. 21-30(10)

Publisher: Springer

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Abstract:

The recent long-term integration of JPL ephemeris DE403/LE403 yielded lunar physical librations covering 6000 years. A Fourier analysis of a 718-year subset of this span produced estimates of the component frequencies of the forced and free librations. A subsequent iterative least-squares estimation procedure provided precise values for phases and for time-varying amplitudes and frequencies. Two free libration modes were found; presence of a third is possible but close to the noise.

Document Type: Regular Paper

Affiliations: Jet Propulsion Laboratory, California Institute of Technology Pasadena, California, USA

Publication date: January 1, 1996

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