Data Release 3: the Solar System survey
Journal
Date Issued
2023
Author(s)
Tanga, P.
•
Pauwels, T.
•
Mignard, F.
•
Muinonen, K.
•
•
David, P.
•
Hestroffer, D.
•
Spoto, F.
•
Berthier, J.
•
Guiraud, J.
•
Roux, W.
•
Carry, B.
•
Delbo, M.
•
•
Fouron, C.
•
Galluccio, L.
•
Jonckheere, A.,
•
Klioner, S.A.
•
Lefustec, Y.
•
Liberato, L.
•
Ordénovic, C.
•
Oreshina-Slezak, I.
•
Penttilä, A.
•
Pailler, F.
•
Panem, Ch.
•
Petit, J.-M.
•
Portell, J.
•
Poujoulet, E.
•
Thuillot, W.
•
Van Hemelryck, E.
•
Burlacu, A.
•
Lasne, Y.
•
Managa, S.
Abstract
The third data release by the Gaia mission of the European Space (DR3) is the
first release to provide the community with a large sample of observations for
more than 150 thousand Solar System objects, including asteroids and natural
planetary satellites. The release contains astrometry (over 23 million epochs)
and photometry, along with average reflectance spectra of 60518 asteroids and
osculating elements. We present an overview of the procedures that have been
implemented over several years of development and tests to process Solar System
data at the level of accuracy that Gaia can reach. We illustrate the data
properties and potential with some practical examples. In order to allow the
users of DR3 to best exploit the data, we explain the assumptions and
approaches followed in the implementation of the data processing pipeline for
Solar System processing, and their effects in terms of data filtering,
optimisation, and performances. We then test the data quality by analysing
post-fit residuals to adjusted orbits, the capacity of detecting subtle
dynamical effects (wobbling due to satellites or shape and Yarkovsky
acceleration), and to reproduce known properties of asteroid photometry (phase
curves and rotational light curves). The DR3 astrometric accuracy is a clear
improvement over the data published in DR2, which concerned a very limited
sample of asteroids. The performance of the data reduction is met, and is
illustrated by the capacity of detecting milliarcsecond-level wobbling of the
asteroid photocentre that is due to satellite or shape effects and contributes
to Yarkovsky effect measurements. The third data release can in terms of data
completeness and accuracy be considered the first full-scale realisation of the
Solar System survey by Gaia.
Volume
674
Issn Identifier
0004-6361
Ads BibCode
2023A&A...674A..12T
Rights
open.access
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