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IAA Transactions, No. 8, ``Celestial Mechanics'', 2002
The Major Planets Satellite Observations with CCD
techniques
A. Lopez Garcia 1 , J. A. Morano Fernandez 2 , A. F. Martinez 3 ,
E. Yagudina 4
1 Astronomical Observatory, Valencia University
2 Astronomy and Astrophysics Dept., Astronomical Observatory, Valencia
University
3 Asociacion Valenciana de Astronomia (AVA), Astronomical Observatory,
Valencia University
4 Institute of Applied Astronomy, St. Petersburg, Russia
Since May 1998 Valencia University Observatory (OAUV) has a new 30--20 cm
double refractor at ``Centro Astronomico del Alto Turia'' (CAAT), 110 km from
Valencia city, and has in its disposal 30 cm telescope of Astronomy Department
at Burjassot University Campus.
OAUV has a new CCD AP10 sensor of great format (2048 by 2048 pixels,
28 by 28 mm wide) that allows to obtain regular observations of asteroids and
major planets satellites.
In this presentation, actual satellites observation programs are described, in­
cluding algorithms for ephemerides, zone maps, files related to CCD images,
measurement and reduction of observations. Accurate ephemerides for every hour
obtained with IAA ERA system [1,2] provide identification of satellites on CCD
images. The preliminary investigations of astrometrical properties and images of
both satellites and stars in frame of a CCD camera have been performed.
Reduction of CCD zones includes several Tycho--2 catalogue stars. Obser­
vations of satellites obtained at CAAT and Burjassot Campus are described.
Preliminary results are very promising and allow us to take part in several inter­
national programs:
1. the IAA program suggested in 1998 [3,4] and providing the orientation of
Hipparcos catalogue with respect to dynamical coordinate system on the base
of CCD observations of relative positions of major planets satellites and the
Hipparcos stars made at the time of the close conjunctions;
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2. the BDL program of absolute observations of Galilean satellites of Jupiter
for improving the elements of Jupiter orbit in DE403--5 and for further devel­
opment of the the theories 0f motion of the satellites themselves [5], including
mutual events for the satellites.
The first results of processing of actual observations of relative positions of
Galilean satellites, satellites of Uranus and Saturn (2001), according to IAA pro­
gram are described.
References
1. Krasinsky G. A., Vasilyev M. V. ERA: knowledge base for ephemeris and dy­
namical astronomy. In: Proceedings of IAU Colloquium 165, Poznan, Poland,
July 1--5, Wytrzyszczak et al. (ed.), 1997, 239--244.
2. Krasinsky G. A., Vasilyev M. V. ERA--7 Manual, Anonymous FTP
quasar:ipa:nw:ru=incoming=era, file ERA7.ps.
3. Casas R., Krasinsky G. A., Yagudina E. I. CCD observations of relative
positions of Galilean satellites of Jupiter and star 104297 HIPPARCOS (1997
November 12 -- 124). Communications of IAA, 1998, No. 117, 1--18.
4. Casas R., Krasinsky G. A., Oscos A., Sveshnikov M. L. Analysis of conjunc­
tion of Galilean satellites of Jupiter and stars of HIPPARCOS Catalogue in
1997--1999. IAA Trans., 2000, 5, 70--92 (in Russian).
5. Vasilyev M. V., Krasinsky G. A., Sveshnikov M. L., Gorel G. K., Gudko­
va L. A. The improvements of Jupiter ephemeris by observations of Galilean
satellites of Jupiter in Nikolaev 1963--1997. Book of abstracts of the confer­
ence: Astrometry, geodynamics and celestial mechanics at XXI threshold,
St. Petersburg, 2000 (in Russian).
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