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Title: | Astrometry from CCD photometry of mutual events of Jovian satellites from VBO during 1997 |
Authors: | Vasundhara, R |
Keywords: | Eclipses Astrometry Ephemerides Occultations Planets And Satellites: General |
Issue Date: | Jul-2002 |
Publisher: | EDP Sciences |
Citation: | Astronomy and Astrophysics, Vol. 389, No. 1, pp. 325 - 333 |
Abstract: | 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. |
URI: | http://hdl.handle.net/2248/2803 |
ISSN: | 0004-6361 |
Appears in Collections: | IIAP Publications |
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Vasundhara R.pdf | 544.01 kB | Adobe PDF | ![]() View/Open |
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