Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...389..325v&link_type=abstract
Astronomy and Astrophysics, v.389, p.325-333 (2002)
Astronomy and Astrophysics
Astrophysics
7
Eclipses, Astrometry, Ephemerides, Occultations, Planets And Satellites: General
Scientific paper
Astrometric results of CCD observations of the mutual events of the Galilean satellites of Jupiter from the Vainu Bappu Observatory are presented. The shifts in the photo-centers on the disks of Io and Europa due to albedo variations inferred from the available mosaics of Galileo imagery are determined. The estimated shifts from ~90 km East to ~50 km West on Io and from ~50 km East to ~30 km West for Europa during one orbital period are comparable to the accuracies provided by the present-day ephemerides. In a given mutual event series, the mutual events involving a given satellite pair dominate in number and occur nearly at the same orbital longitude within +/-20 degr ; all the events are therefore delayed or all of them advanced depending on the direction of the shift of the photo-center. The implications of including these cumulative and sustained longitude residuals on the constructed ephemerides are discussed.
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