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Local tests of gravitation with Gaia observations of Solar System Objects

Published online by Cambridge University Press:  07 March 2018

Aurélien Hees ,
Christophe Le Poncin-Lafitte ,
Daniel Hestroffer  and
Pedro David
Aurélien Hees
Affiliation:
Department of Physics and Astronomy, University of California, Los Angeles, CA 90095, USA email: ahees@astro.ucla.edu
Christophe Le Poncin-Lafitte
Affiliation:
SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, LNE, 61 avenue de l'Observatoire, 75014 Paris, France
Daniel Hestroffer
Affiliation:
IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Lille, 77 av. Denfert-Rochereau, 75014 Paris, France
Pedro David
Affiliation:
IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Lille, 77 av. Denfert-Rochereau, 75014 Paris, France
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Abstract

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In this proceeding, we show how observations of Solar System Objects with Gaia can be used to test General Relativity and to constrain modified gravitational theories. The high number of Solar System objects observed and the variety of their orbital parameters associated with the impressive astrometric accuracy will allow us to perform local tests of General Relativity. In this communication, we present a preliminary sensitivity study of the Gaia observations on dynamical parameters such as the Sun quadrupolar moment and on various extensions to general relativity such as the parametrized post-Newtonian parameters, the fifth force formalism and a violation of Lorentz symmetry parametrized by the Standard-Model extension framework. We take into account the time sequences and the geometry of the observations that are particular to Gaia for its nominal mission (5 years) and for an extended mission (10 years).

Keywords

gravitationephemeridesminor planetsasteroids
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 63 - 66
Copyright
Copyright © International Astronomical Union 2018 

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