On the along-track acceleration of the Lageos satellite

Physics

Scientific paper

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Lageos (Satellite), Orbit Calculation, Orbit Decay, Precession, Aerodynamic Drag, Atmospheric Density, Satellite Tracking, Spacecraft Motion

Scientific paper

An effort is made to reassess the current models of Yarkovsky thermal drag (Rubincam, 1990) and the Yarkovsky-Schach effect (Afonso et al., 1989), and the new mechanism of anisotropic reflection by Lageos itself is evaluated. The maximal antipodal temperature difference of the retroflectors due to solar heating, the orientation of Lageos' spin axis, and the asymmetrical specular albedo are estimated simultaneously by fitting the models with the observed data. A straightforward method is used to determine the results of photon thrust, which is applicable to anisotropic reemission of both terrestrial infrared and direct solar radiation. It is also shown that when allowances are made for the alignment of Lageos' spin axis with that of the earth, the combination of four different drag models reduces the standard deviation of the residuals by 61 percent.

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