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Communication Dans Un Congrès Année : 2018

Updates from INPOP ephemeris: From fundamental physics tests to lunar interior probe

Résumé

We present here, our published results obtained with the latest version of the Planetary and Lunar ephemeris - INPOP17a [1]. The lunar part of this solution is fitted to LLR data (1969-2017) with constraints imposed on the lunar gravity field coefficients using estimates derived from the GRAIL mission [2]. The post-fit residuals obtained with INPOP17a reach 1.15cm for the recent and most accurate LLR datasets. We take advantage of this accurate model by performing tests of the Universality of Free Fall (UFF) of the Earth-Moon system in the gravitational field of the Sun, in an attempt to find signatures arising from a differential acceleration of the test bodies. We compare our estimates with other LLR analysis groups and show no violation at the (_3.8 ± 7.1) _ 10_14 [3]. Additional results to be presented include, sensitivity of the UFF violation estimates to various fluid core sizes and the sensitivity of lunar dynamical model parameters to the principal axis PA rotation of the GRAIL solution. The latter as a first attempt to account for incompatibilities found between GRAIL-derived gravity field solutions and LLR estimates [4,5]. Furthermore, new estimates are presented that includes recent 6 months of high accuracy IR LLR data set from Grasse station [6] obtained in 2018.[1] Viswanathan V., Fienga A., Gastineau M., Laskar J., 2017, Notes Scientifiques et Techniques de l'Institut de Mecanique Celeste, Vol. 108[2] Konopliv, A. S. et al. The JPL lunar gravity field to spherical harmonic degree 660 from the GRAIL Primary Mission. J. Geophys. Res. Planets 118, 1415-1434 (2013).[3] Viswanathan, V. et al. The new lunar ephemeris INPOP17a and its application to fundamental physics. Mon. Not. R. Astron. Soc. (2018). doi:10.1093/mnras/sty096[4] Williams, J. G. et al. Lunar interior properties from the GRAIL mission. J. Geophys. Res. Planets 119, 1546-1578 (2014).[5] Viswanathan, V. Improving the dynamical model of the Moon using lunar laser ranging and spacecraft data. (Observatoire de Paris, 2017).[6] Courde, C. et al. Lunar laser ranging in infrared at the Grasse laser station. Astron. Astrophys. 602, A90 (2017).
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hal-03809034 , version 1 (10-10-2022)

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Vishnu Viswanathan, Nicolas Rambaux, Agnès Fienga, Olivier Minazzoli, Léo Bernus, et al.. Updates from INPOP ephemeris: From fundamental physics tests to lunar interior probe. 42nd COSPAR Scientific Assembly, Jul 2018, Pasadena, California, USA, United States. ⟨hal-03809034⟩
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