HR: 17:15h
AN: G42C-06    [PDF]
TI: Simulation Of The Effect Of Higher Order Zonal Gravity Field Coefficients Of Mars On Jointly-Estimated Time-Varying J2, J3 And Rotation.
AU: * Duron, J
EM: Julien.duron@oma.be
AF: Royal Observatory of Belgium, 3, Avenue Circulaire, Brussels, 1180 Belgium
AU: Karatekin, O
EM: Ozgur.karatekin@oma.be
AF: Royal Observatory of Belgium, 3, Avenue Circulaire, Brussels, 1180 Belgium
AU: Rosenblatt, P
EM: Pascal.Rosenblatt@oma.be
AF: Royal Observatory of Belgium, 3, Avenue Circulaire, Brussels, 1180 Belgium
AU: Dehant, V
EM: Veronique.dehant@oma.be
AF: Royal Observatory of Belgium, 3, Avenue Circulaire, Brussels, 1180 Belgium
AU: Barriot, J
EM: Jean-Pierre.Barriot@cnes.fr
AF: Midi-Pyrenees Observatory, 14 avenue Edouard Belin, Toulouse, 31400 France
AB: Largest seasonal variations in the gravity field of Mars occur for the J2 and J3 coefficients. These coefficients were estimated recently from MGS data. It is believed that these estimates contain also additional information from the higher order coefficients. In the present study, we investigate the effect of higher order zonal gravity field coefficients on the estimation of the time-varying J2 and J3. Numerical simulations with an orbit determination computer program (GINS, provided by GRGS/CNES) are performed. Seasonal variations in the gravity field coefficients are given as input with the help of the Global Circulation Model of LMD. We study the ability to recover these values from simulated tracking data between an orbiter and the Earth. Additional radio links between the orbiter and lander(s) on the surface are also used in order to accurately constrain rotation variations.
DE: 1227 Planetary geodesy and gravity (5420, 5714, 6019)
DE: 5714 Gravitational fields (1227)
SC: Geodesy [G]
MN: 2003 Fall Meeting