Astrometric results of observations of mutual occultations and eclipses of the Galilean satellites of Jupiter in 2002 2003

Details Astrometric results of observations of mutual occultations and eclipses of the Galilean satellites of Jupiter in 2002 2003 Astrometric results of observations of mutual occultations and eclipses of the Galilean satellites of Jupiter in 2002 2003

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008p%26ss...56.1785e&link_type=abstract

Planetary and Space Science, Volume 56, Issue 14, p. 1785-1790.

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Scientific paper

We suggest a new approach and develop an original method for deriving astrometric data from the photometry of mutual occultations and eclipses of planetary satellites. We decide to model not the relative apparent motion of one satellite with respect to another satellite but the deflection of the observed relative motion with respect to the theoretical motion implied by appropriate ephemerides. We have attempted to reduce the results of photometric observations of the Gallilean satellites during their mutual occultations and eclipses in 2002 2003. The data of observation for 319 light curves of 106 mutual events were received from the observers. The reliable 245 light curves were processed with our method. Eighty six apparent relative positions have been obtained. Systematic errors arise inevitably while deriving astrometric data. Most of them are due to factors that are unrelated to the methods for deriving astrometric data. The systematic errors are more likely due to incorrect excluding the effect of background on photometric counts. In the case of mutual occultations, the flux drop is determined to a considerable degree by the ratio of the mean albedos of the two satellites. Some mutual event observations revealed wrong adopted values of the mean albedos.

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