A&A 367, 1061-1069 (2001)
DOI: 10.1051/0004-6361:20000548

An analysis of satellite calibration methods for CCD astrometry of Saturn's satellites

K. X. Shen^{1, 2, 3}, G. Dourneau⁴, R. C. Qiao^{1, 3} and J. R. Liu<sup>1, 3

1</sup>  Shannxi Astronomical Observatory, Lintong, Shannxi 710600, PR China
²  Chinese National Astronomical Research Center
³  United Laboratory for Optical Astrometry, The Chinese Academy of Science, PR China
⁴  Observatoire de l'Université Bordeaux I, BP 89, 33270 Floirac, France

(Received 25 July 2000 / Accepted 28 November 2000 )

Abstract
This paper presents an analysis of astrometric reduction methods for the calibration of a CCD target. To compare these methods, we collected about 3000 recent CCD observations between 1990-1997. We discuss the comparison of the four main contemporary theories describing the eight major satellites of Saturn, used in recent CCD astrometric reduction. We show that these theories developed by Taylor & Shen (1988), Dourneau (1993), Harper & Taylor (1999) and Duriez & Vienne (1997), give a rather good representation of the orbits of the eight main satellites, especially for satellites III-VI. In the CCD astrometric reduction, we point out a bias of the theories on the derived satellite positions, which can reach about 0 fraction of arcsecond03. Duriez and Vienne's TASS theory (1997), built with significantly higher consistency than the other three, generally leads to the lowest residuals for the observations analysed here. Due to its high quality, we recommend use of this theory for CCD reduction. Systematic errors affecting satellites' derived positions should be small, due to the quality of the TASS theory. This procedure might be an alternative to the multi-theory reduction method previously proposed by Qiao et al. (1999). Observations of satellites obtained from CCD reduction using TASS are expected to be significantly more accurate (0 fraction of arcsecond015) than observations reduced from any other theory (about 0 fraction of arcsecond05).

Key words: planetes & satellites: Saturn -- astrometry -- methods: observational

Offprint request: G. Dourneau, dourneau@observ.u-bordeaux.fr

SIMBAD Objects in preparation

© ESO 2001

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