Astrometric results of observations of mutual occultations and eclipses of the Galilean satellites of Jupiter in 2003

Details Astrometric results of observations of mutual occultations and eclipses of the Galilean satellites of Jupiter in 2003 Astrometric results of observations of mutual occultations and eclipses of the Galilean satellites of Jupiter in 2003

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...453.1141e&link_type=abstract

Astronomy and Astrophysics, Volume 453, Issue 3, July III 2006, pp.1141-1149

Astronomy and Astrophysics

Astrophysics

15

Occultations, Eclipses, Planets And Satellites: General, Astrometry

Scientific paper

Context: . The photometry of mutual occultations and the eclipses of natural planetary satellites can be used to infer very accurate astrometric data. This can be achieved by analyzing the light curves of the satellites observed during these mutual events. Aims: . The final goal of observations is to refine the models of motion for the natural satellites, and to develop a very accurate photometric model of mutual occultations and eclipses of satellites. This paper is focusing on the differences of topocentric or heliocentric coordinates of satellites pairs by analyzing the photometry of mutual occultations and the eclipses of natural satellites. Methods: . We propose the most accurate photometric model of mutual events to date based on all available data about the satellites, and have developed the corresponding method for extracting astrometric data. We analyze the errors of astrometric results obtained in terms of different scattering laws allowing for reflecting properties of the satellites surfaces. In addition we consider how to allow various previously neglected effects. Results: . We describe the results obtained by applying our method to observations of mutual occultations and eclipses of the Galilean satellites of Jupiter made in 2002-2003. We show that the coordinate errors due to irreducible systematic errors of photometry are about the same as the errors introduced by neglecting the above effects. We find the available maps of satellites surfaces to be unsuitable for deriving photometric event models.

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