Astrometric positions for 18 irregular satellites of giant planets from 23 years of observations
A. R. Gomes-J\'unior, M. Assafin, R. Vieira-Martins, J.-E. Arlot, J., I. B. Camargo, F. Braga-Ribas, D. N. da Silva Neto, A. H. Andrei, A., Dias-Oliveira, B. E. Morgado, G. Benedetti-Rossi, Y. Duchemin, J. Desmars, V., Lainey, W. Thuillot

TL;DR
This study provides 6000+ precise astrometric positions for 18 irregular satellites of giant planets, improving orbital data and revealing potential systematic errors in existing ephemerides through analysis of 23 years of observations.
Contribution
It offers a comprehensive dataset of astrometric positions for irregular satellites, enhancing orbital models and identifying discrepancies in current ephemerides.
Findings
Over 6000 positions obtained for 18 satellites
Some orbital parameters, like inclination of Carme, show systematic errors
Positions are more than 50% of data used in earlier orbital models
Abstract
The irregular satellites of the giant planets are believed to have been captured during the evolution of the solar system. Knowing their physical parameters, such as size, density, and albedo is important for constraining where they came from and how they were captured. The best way to obtain these parameters are observations in situ by spacecrafts or from stellar occultations by the objects. Both techniques demand that the orbits are well known. We aimed to obtain good astrometric positions of irregular satellites to improve their orbits and ephemeris. We identified and reduced observations of several irregular satellites from three databases containing more than 8000 images obtained between 1992 and 2014 at three sites (Observat\'orio do Pico dos Dias, Observatoire de Haute-Provence, and European Southern Observatory - La Silla). We used the software PRAIA (Platform for Reduction of…
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