scholarly journals Estimation of the Lunar Physical Librations

1997 ◽  
Vol 165 ◽  
pp. 21-30 ◽  
Author(s):  
X X Newhall ◽  
J. G. Williams

AbstractThe 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.

2008 ◽  
Vol 36 (2) ◽  
pp. 742-786 ◽  
Author(s):  
Piotr Fryzlewicz ◽  
Theofanis Sapatinas ◽  
Suhasini Subba Rao

Sign in / Sign up

Export Citation Format

Share Document