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Article | REF: TRP4052 V1

Space Trajectories. Collision Risks on Orbit

Author: Max CERF

Publication date: December 10, 2020, Review date: July 30, 2021

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1. Orbitography

This section recalls the laws of orbital motion and the modeling of uncertainties.

These models are used to predict conjunctions and assess the associated risks.

1.1 Orbital motion

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1.1.1 Keplerian orbit

A Keplerian orbit is the trajectory followed by a material point in a central gravity field. This orbit is a conic characterized by its orbital parameters (a, e, i, Ω, ω, θ) in the geocentric Galilean reference frame (O center of the Earth, Z axis to the North Pole,...

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