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Evolution of INPOP planetary ephemerides and Bepi-Colombo simulations

Published online by Cambridge University Press:  30 May 2022

A. Fienga
Affiliation:
GéoAzur, Observatoire Côte d’Azur, Université Côte d’Azur, CNRS, 250 Av. A. Einstein, Valbonne, 06560, France email: agnes.fienga@oca.eu IMCCE, Observatoire de Paris, PSL University, CNRS, Sorbonne Université, 77 avenue Denfert-Rochereau, Paris, 75014, France
L. Bigot
Affiliation:
Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Lagrange UMR 7293, CS 34229, 06304, Nice Cedex 4, France
D. Mary
Affiliation:
Lagrange, Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Lagrange UMR 7293, CS 34229, 06304, Nice Cedex 4, France
P. Deram
Affiliation:
GéoAzur, Observatoire Côte d’Azur, Université Côte d’Azur, CNRS, 250 Av. A. Einstein, Valbonne, 06560, France email: agnes.fienga@oca.eu
A. Di Ruscio
Affiliation:
GéoAzur, Observatoire Côte d’Azur, Université Côte d’Azur, CNRS, 250 Av. A. Einstein, Valbonne, 06560, France email: agnes.fienga@oca.eu Dipartimento di Ingegneria Meccanica e Aerospaziale, Sapienza Università di Roma, via Eudossiana 18, 00184 Rome, Italy
L. Bernus
Affiliation:
GéoAzur, Observatoire Côte d’Azur, Université Côte d’Azur, CNRS, 250 Av. A. Einstein, Valbonne, 06560, France email: agnes.fienga@oca.eu IMCCE, Observatoire de Paris, PSL University, CNRS, Sorbonne Université, 77 avenue Denfert-Rochereau, Paris, 75014, France
M. Gastineau
Affiliation:
IMCCE, Observatoire de Paris, PSL University, CNRS, Sorbonne Université, 77 avenue Denfert-Rochereau, Paris, 75014, France
J. Laskar
Affiliation:
IMCCE, Observatoire de Paris, PSL University, CNRS, Sorbonne Université, 77 avenue Denfert-Rochereau, Paris, 75014, France
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Abstract

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We give here a detailed description of the latest INPOP planetary ephemerides INPOP20a. We test the sensitivity of the Sun oblateness determination obtained with INPOP to different models for the Sun core rotation. We also present new evaluations of possible GRT violations with the PPN parameters β, γ and . With a new method for selecting acceptable alternative ephemerides we provide conservative limits of about 7.16 × 10-5 and 7.49 × 10-5 for β-1 and γ-1 respectively using the present day planetary data samples. We also present simulations of Bepi-Colombo range tracking data and their impact on planetary ephemeris construction. We show that the use of future BC range observations should improve these estimates, in particular γ. Finally, interesting perspectives for the detection of the Sun core rotation seem to be reachable thanks to the BC mission and its accurate range measurements in the GRT frame.

Type
Research Article
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of International Astronomical Union

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