Estimation of the lunar physical librations |
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| Authors: | X X Newhall J G Williams |
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| Institution: | (1) Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA |
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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. |
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