The orbits of outer planetary satellites using theGaiadata
- 30 March 2023
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 522 (1), 165-172
- https://doi.org/10.1093/mnras/stad958
Abstract
Launch of the Gaia space observatory started a new era in astrometry when the accuracy of star coordinates increased by thousands of times. Significant improvement of accuracy was also expected for the coordinates of the Solar system bodies. Gaia DR3 provided us with the data which could be used to test our expectations. In this work, we refine the orbits of a number of outer planetary salellites using both ground-based and Gaia observations. From thirteen outer satellites observed by Gaia, we chose six to obtain their orbits. Some specific moments in using observations of outer satellites made by Gaia are demonstrated. These pecularities stem from scanning motion of Gaia, in particular from the fact that the accuracy of observations is significantly different along and across the scanning direction. As expected, Gaia observations proved to be more precise than those made from Earth, which results in more accurate satellite ephemerides. We estimate accuracy of the ephemerides of considered satellites for the interval between 1996 and 2030. As astrometric positions published in Gaia DR3 were not corrected for the relativistic light deflection by the Sun, we took into account this effect, which slightly diminished the rms residuals. In addition, relativistic light deflection by the giant planets was estimated, which, as it turned out, can be neglected with the given accuracy of Gaia observations.Funding Information
- European Space Agency
This publication has 11 references indexed in Scilit:
- New ephemerides of outer planetary satellitesMonthly Notices of the Royal Astronomical Society, 2022
- Core rotation braking on the red giant branch for various mass rangesAstronomy & Astrophysics, 2018
- The Orbits of Jupiter’s Irregular SatellitesThe Astronomical Journal, 2017
- Phoebe’s orbit from ground-based and space-based observationsAstronomy & Astrophysics, 2013
- Precision of the ephemerides of outer planetary satellitesPlanetary and Space Science, 2010
- The NSDB natural satellites astrometric databaseAstronomy & Astrophysics, 2009
- The natural satellites ephemerides facility MULTI-SATAstronomy & Astrophysics, 2008
- Ephemerides of the outer Jovian satellitesAstronomy & Astrophysics, 2005
- Orbits of new outer planetary satellites based on observationsSolar System Research, 2005
- Implicit single-sequence methods for integrating orbitsCelestial Mechanics and Dynamical Astronomy, 1974