GASTINEAU , Mickaël

Context: We are testing strong equivalence principle with planetary ephemerides in the frame of the Brans-Dicke class of scalar tensor theories. Aims: In this work, we apply our recently proposed Bayesian methodology on the Brans-Dicke case, with an emphasis on the issue of the strong equivalence principle. Methods: We compare the posterior...

We present here the new version of the INPOP planetary ephemerides based on an update of the observational data sets as well as new results in term of asteroid masses and constraints obtained for General relativity parameters PPN beta, gamma, J2 and the secular variations of G. New constraints about the hypothetical existence of a super-Earth...

In this work, we investigated Bayesian methodologies for constraining in the Solar System a Yukawa suppression of the Newtonian potential -- which we interpret as the effect of a non-null graviton mass -- by considering its impact on planetary orbits. Complementary to the previous results obtained with INPOP planetary ephemerides, we consider...

Current knowledge of Mercury orbit is mainly brought by the direct radar ranging obtained from the 60s to 1998 and five Mercury flybys made by Mariner 10 in the 70s, and MESSENGER made in 2008 and 2009. On March 18, 2011, MESSENGER became the first spacecraft orbiting Mercury. The radioscience observations acquired during the orbital phase of...

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LLR in IR (1064nm) gives an improvement in the temporal and spatial distribution of observations. Estimates of the lunar core using IR data will be presented.

The IAU Commission 4 Working Group on Standardizing Access to Ephemerides recommends the use of the Spacecraft and Planet Kernel (SPK) format to provide a uniform format for the position ephemerides of planets and other natural solar system bodies, and the use of the Planetary Constants Kernel (PCK) for the orientation of these bodies. These...