Natural Satellites Service. Special ephemerides
of the Tycho-2 Catalogue stars and the main natural planetary satellites
- We present the precalculated circumstances of the apparent
encounters of the
Galilean satellites of Jupiter and
the main satellites of Saturn (S1-S8)
with the Tycho-2 Catalogue stars.
In the beginning of the ephemerides the star conditional catalogue is given.
Instead of three numbers (ntch1 ntch2 ntch3) describing a position of a star
in the Tycho-2 catalogue, one conditional number is given. The conformity is
presented in a tabular form in the beginning of each ephemeride.
Apparent angular distances between a star and a satellite given in the
ephemerides tables do not exceed 6 arcminutes for the main satellites of Saturn
(S1-S8) and 15 arcminutes for the Galilean satellites.
The highest accuracy of observations is reached at the periods
when a satellite and a star of the same magnitude
approach each other and fall within the same CCD frame.
These circumstances allow to associate, with the best possible accuracy,
the dynamical reference frame with that of the star catalogue
using an appropriate theory of satellite motion.
The ephemerides of the apparent encounters of the satellites
with the stars allow to choose more appropriate circumstances
of observations using a given CCD frame with a given telescope.
Explanation to the conditional catalogue.
Explications to the Galilean satellites of Jupiter ephemerides tables.
Explications to the main satellites of Saturn (S1-S8) ephemerides tables.
of the Tycho-2 Catalogue stars and the Galilean satellites of Jupiter
of the Tycho-2 Catalogue stars and the major satellites of Saturn
This work was supported by the Russian Foundation for Basic
Research, project no. 03-02-17441.
Celestial mechanics department / Sternberg Astronomical Institute /