A combined theory for zonal harmonic and resonance perturbations of a near-circular orbit with applications to COSMOS 1603 (1984-106A)

Astronomy and Astrophysics – Astronomy

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Circular Orbits, Earth Gravitation, Orbit Perturbation, Orbital Resonances (Celestial Mechanics), Satellite Orbits, Zonal Harmonics, Cosmos Satellites, Gravitational Fields, Least Squares Method

Scientific paper

Theory for the motion of a satellite in a near-circular orbit and perturbed by zonal and resonance terms in the Earth's gravity field is developed. Commensurability with respect to both primary and secondary terms is considered with the solution dependent on the depths of the resonances. The theory is applied to the motion of COSMOS 1603 (1984-106A) which approached 14:1 resonance in 1987. Values of lumped harmonics derived from least-squares analysis are in close agreement with previous studies of 1984-106A and global gravity field models. The theory is finally extended to incorporate the effects of air drag.

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