Gaia Focused Product Release

Autor(en): , P. David, F. Mignard, D. Hestroffer, P. Tanga, F. Spoto, J. Berthier, T. Pauwels, W. Roux, A. Barbier, A. Cellino, B. Carry, M. Delbo, A. Dell'oro, C. Fouron, L. Galluccio, S. A. Klioner, N. Mary, K. Muinonen, C. Ordenovic, I. Oreshina-Slezak, C. Panem, J. M. Petit, J. Portell, A. G.A. Brown, W. Thuillot, A. Vallenari, T. Prusti, J. H.J. De Bruijne, F. Arenou, C. Babusiaux, M. Biermann, O. L. Creevey, C. Ducourant, D. W. Evans, L. Eyer, R. Guerra, A. Hutton, C. Jordi, U. Lammers, L. Lindegren, X. Luri, S. Randich, P. Sartoretti, R. Smiljanic, N. A. Walton, C. A.L. Bailer-Jones, U. Bastian, M. Cropper, J. Alves, T. Lebzelter
Abstrakt: Context. We report the exploitation of a sample of Solar System observations based on data from the third Gaia Data Release (Gaia DR3) of nearly 157 000 asteroids. It extends the epoch astrometric solution over the time coverage planned for the Gaia DR4, which is not expected before the end of 2025. This data set covers more than one full orbital period for the vast majority of these asteroids. The orbital solutions are derived from the Gaia data alone over a relatively short arc compared to the observation history of many of these asteroids. Aims. The work aims to produce orbital elements for a large set of asteroids based on 66 months of accurate astrometry provided by Gaia and to assess the accuracy of these orbital solutions with a comparison to the best available orbits derived from independent observations. A second validation is performed with accurate occultation timings. Methods. We processed the raw astrometric measurements of Gaia to obtain astrometric positions of moving objects with 1D sub-mas accuracy at the bright end. For each asteroid that we matched to the data, an orbit fitting was attempted in the form of the best fit of the initial conditions at the median epoch. The force model included Newtonian and relativistic accelerations to derive the observation equations, which were solved with a linear least-squares fit. Results. Orbits are provided in the form of state vectors in the International Celestial Reference Frame for 156 764 asteroids, including near-Earth objects, main-belt asteroids, and Trojans. For the asteroids with the best observations, the (formal) relative uncertainty σ_a/a is better than 10^-10. Results are compared to orbits available from the Jet Propulsion Laboratory and MPC. Their orbits are based on much longer data arcs, but from positions of lower quality.
Organisation(en): Institut für Astrophysik
Externe Organisation(en): Université de recherche Paris Sciences et Lettres, Université Côte d'Azur, Harvard-Smithsonian Center for Astrophysics, Royal Observatory of Belgium, Centre national d'études spatiales (CNES), INAF-Osservatorio Astrofisico di Torino, INAF - Osservatorio Astrofisico di Arcetri, Technische Universität Dresden, University of Helsinki, Finnish Geospatial Research Institute, Institut UTINAM, Universitat de Barcelona, Institut d'Estudis Espacials de Catalunya (IEEC), Leiden University, INAF - Osservatorio Astronomico di Padova, European Space Research & Technology Centre (ESA/ESTEC), Observatoire de Paris, Université Grenoble-Alpes, Universität Heidelberg, Laboratoire d'Astrophysique de Bordeaux, University of Cambridge, Universität Genf, European Space Astronomy Centre (ESA), Lund University, Lund Observatory, Polish Academy of Sciences (PAS), Max-Planck-Institut für Astronomie, University College London
Journal: Astronomy and Astrophysics
Band: 680
Anzahl der Seiten: 24
ISSN: 0004-6361
DOI: https://doi.org/10.1051/0004-6361/202347270
Publikationsdatum: 12-2023
Peer-reviewed: Ja
ÖFOS 2012: 103003 Astronomie, 103004 Astrophysik
Schlagwörter
ASJC Scopus Sachgebiete: Astronomy and Astrophysics, Space and Planetary Science
Link zum Portal: https://ucrisportal.univie.ac.at/de/publications/e8e8bc1c-157a-4fea-a57d-1b59732b2c84

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