Issue |
A&A
Volume 389, Number 1, July I 2002
|
|
---|---|---|
Page(s) | 325 - 333 | |
Section | Celestial mechanics and astrometry | |
DOI | https://doi.org/10.1051/0004-6361:20020544 | |
Published online | 14 June 2002 |
Astrometry from CCD photometry of mutual events of Jovian satellites from VBO during 1997
Indian Institute of Astrophysics, Bangalore 560034, India
Corresponding author: rvas@iiap.ernet.in
Received:
12
February
2002
Accepted:
5
April
2002
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 ±
; 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.
Key words: eclipses / astrometry / ephemerides / occultations / planets and satellites: general
© ESO, 2002
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