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Stuttgart 2012 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 5: Planeten und kleine Körper I

EP 5.5: Vortrag

Mittwoch, 14. März 2012, 15:00–15:15, V55.02

Rosetta at comet 67P/Churyumov-Gerasimenko: Spacecraft orbit modeling — •Matthias Hahn1, Martin Pätzold1, Silvia Tellmann1, Bernd Häusler2, and Tom Andert21Rheinisches Institut für Umweltforschung, Abteilung Planetenforschung, Cologne, Germany — 2Institut für Raumfahrttechnik, Universität der Bundeswehr, Munich, Germany

The Rosetta spacecraft is on its way to its target comet 67P. The science objectives of the Radio Science (RSI) experiment addresses fundamental aspects of cometary science such as the determinations of the nucleus mass and bulk density, its size and shape, its gravity field and internal structure, and its perturbed interplanetary orbit. The radio carrier links transmitted by the spacecraft and received on Earth will be used for these investigations. The motion of the spacecraft will be perturbed near the comet nucleus. The perturbed Doppler frequency shifts of the transmitted radio signals will be used to reconstruct the flown orbit. In order to extract small changes of the perturbed Doppler frequency, a prediction of the unperturbed orbit is needed which must include best known estimates for all forces acting on the spacecraft. These forces are the nucleus gravity field, third body perturbations, the solar radiation pressure, the solar wind pressure and the cometary outgassing. The cometary outgassing is the dominant force near the comets nucleus. The gas streams radially away from the nuceus and will cause perturbations in the dynamics of the spacecraft. Simulations for different outgassing scenarios will be presented and their influence on spacecraft dynamics will be analysed.

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