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The current knowledge of Mercury orbit has mainly been gained by direct radarranging obtained from the 60s to 1998 and by five Mercury flybys made byMariner 10 in the 70s, and MESSENGER made in 2008 and 2009. On March 18, 2011,MESSENGER became the first spacecraft to orbit Mercury. The radioscienceobservations acquired during the orbital phase of MESSENGER drasticallyimproved our knowledge of the orbit of Mercury. An accurate MESSENGER orbit isobtained by fitting one-and-half years of tracking data using GINS orbitdetermination software. The systematic error in the Earth-Mercury geometricpositions, also called range bias, obtained from GINS are then used to fit theINPOP dynamical modeling of the planet motions. An improved ephemeris of theplanets is then obtained, INPOP13a, and used to perform general relativitytests of PPN-formalism. Our estimations of PPN parameters (beta and gamma?) aremore stringent than previous results.

Use of MESSENGER radioscience data to improve planetary ephemeris and to test general relativity