Abstract
The long-period perturbations in the orbit of Lageos satellite due to the earth's albedo have been found using a new analytical formalism. The earth is assumed to be a sphere whose surface diffusely reflects sunlight according to Lambert's law. Specular reflection is not considered. The formalism is based on spherical harmonics; it produces equations which hold regardless of whether the terminator is seen by the satellite or not. Specializing in the case of a realistic zonal albedo shows that Lageos' orbital semimajor axis changes periodically by only about a centimeter and the eccentricity by two parts in 105. The longitude of the node increases secularly by about 6×10−4 arc sec yr−1. The effect considered here can explain neither the secular decay of 1.1 mm day−1 in the semimajor axis nor the observed along-track variations in acceleration of order 2×10−12 ms−2.
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Rubincam, D.P., Weiss, N.R. Earth albedo and the orbit of Lageos. Celestial Mechanics 38, 233–296 (1986). https://doi.org/10.1007/BF01231110
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DOI: https://doi.org/10.1007/BF01231110