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Gaia-DR2 asteroid observations and INPOP planetary ephemerides

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Abstract

We used the INPOP19a planetary ephemerides to perform the orbital adjustment of 14099 asteroids based on Gaia-DR2 observations and compare for 23 of them the resulting orbits to radar data. As Gaia-DR2 has been processed using the planetary ephemeris INPOP10e, the primary goal of this paper is to confirm the portability of the data when using an updated version of the solar system model. In particular, we point out the fact that the Gaia satellite positions—provided with respect to the INPOP10e solar system barycenter—must be corrected when using another planetary ephemeris. We also present a convenient least square formalism that only handles small matrices and allows the adjustment of global parameters, such as masses. In order to check the consistency of the Gaia observations with other types of observations, we perform an orbital adjustment in combining Gaia and radar range observations for 23 objects, together with a careful post-fit analysis including an estimation of the Gaia systematic errors. Finally, we show that to ensure the combined use of Gaia angular DR2 observations and radar ranging, a more developed than firstly proposed dynamical modeling is required together with the addition of the systematic Gaia bias in the fit procedure. These results give promising directions for the next Gaia delivery, Gaia-DR3.

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Acknowledgements

The authors would like to thank the reviewers for their constructive and helpful remarks, in particular concerning the use of the Gaia systematic error during the post fit analysis and the weighting procedure.

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Authors and Affiliations

  1. GéoAzur, CNRS, Observatoire de la Côte d’Azur, Université Côte d’Azur, 250 Av. A. Einstein, 06560, Valbonne, France

    P. Deram & A. Fienga

  2. IMCCE, Observatoire de Paris, PSL University, CNRS, Sorbonne Université, 77 avenue Denfert-Rochereau, 75014, Paris, France

    A. Fienga, M. Gastineau & J. Laskar

  3. University of California, Los Angeles, CA, USA

    A. K. Verma

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  1. P. Deram
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  2. A. Fienga
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  4. M. Gastineau
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  5. J. Laskar
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Correspondence to A. Fienga.

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Deram, P., Fienga, A., Verma, A.K. et al. Gaia-DR2 asteroid observations and INPOP planetary ephemerides. Celest Mech Dyn Astron 134, 32 (2022). https://doi.org/10.1007/s10569-022-10084-6

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  • DOI: https://doi.org/10.1007/s10569-022-10084-6

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