A study of the lifetimes of geosynchronous transfer orbits

Statistics – Computation

Scientific paper

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Geosynchronous Orbits, Orbit Decay, Orbital Mechanics, Transfer Orbits, Orbit Calculation, Orbit Perturbation, Perigees

Scientific paper

The study concerns the orbit lifetimes of spent upper stages that are used to boost NASA Space Transportation System payloads into geosynchronous transfer orbits. A semi-analytical method of trajectory computation was developed and applied to these particular orbits. It was found that gravitational perturbations of the sun, moon and oblate earth cause large changes in the perigee altitude. The following parameters have a strong influence on orbit lifetimes: Time of year of launch; Inertial orientation of orbital plane; Inclination of orbital plane.

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