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- W2566869679 abstract "A new method has been devised to determine spherical harmonic coefficients of the lunar gravity field. This method uses a two-step data reduction and estimation process. The first step applies a weighted least-squares empirical orbit determination process to Doppler tracking data to estimate long-period Kepler elements and rates. In the second step, lunar gravity coefficients are determined using another weighted least-squares processor which fits the long-period Lagrange perturbation equations to the estimated Keplerian rates. This method has been applied to tracking data from the Lunar Orbiter missions. A gravity poten- tial of degree and order four is presented and error sources discussed. Plots of lunar equipotential surfaces are shown. Gravity field results are applied to various physical properties of the Moon such as moments and products of inertia. This gravity field has been investigated using data from several Apollo missions. Solutions from these data, in all cases except that of Apollo 15, result in improved orbit predictions as compared to those using other fields. All solutions indicate that the field models are still imcomplete. A new method for determining the spherical harmonic coefficients of the lunar gravitational potential is applied to Doppler tracking data from the Lunar Orbiter satellites. This selenodesy scheme consists of two separate data reduction a nd estimation processes. First Doppler data are reduced a nd estimates obtained for the long-period Kepler elements and element rates of the orbit. These r ates are used as input to a second processor which utlizes the long-period Lagrange perturbation equations to determine a finite set of lunar gravity coefficients. This paper presents a lunar gravity model obtained using this method. A nalyses are also included which illustrate some of the characteristic properties of the model." @default.
- W2566869679 created "2017-01-06" @default.
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- W2566869679 date "1972-01-01" @default.
- W2566869679 modified "2023-09-26" @default.
- W2566869679 title "AN E MPIRICALLY D ERIVED L UNAR G RAVITY F IELD" @default.
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- W2566869679 hasPublicationYear "1972" @default.
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