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Estimation of the Lunar Physical Librations

Published online by Cambridge University Press:  12 April 2016

X X Newhall  and
J. G. Williams
X X Newhall
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology Pasadena, California, USA
J. G. Williams
Affiliation:
Jet Propulsion Laboratory, California Institute of Technology Pasadena, California, USA

Abstract

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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.

Type
Dynamics and Astrometry: Present and Future
Information
International Astronomical Union Colloquium , Volume 165: Dynamics and Astrometry of Natural and Artificial Celestial Bodies , 1997 , pp. 21 - 30
Copyright
Copyright © Kluwer 1997

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