On Catalogue of uncontrolled geostationary objects
A.S.Sochilina, R.I.Kiladze
Institute of theoretical astronomy Russ.Acad.Sci, St.-Peterburg
The most urgent problem for the geostationary objects (GEO)
consists in the study of their long periodic orbital evolution under
influence of the resonant perturbations from the geopotential and the
luni-solar attraction. The solution of this problem has both
practical and scientific value.
The first 1994 GEO catalogue contains more than 300 of the
improved orbits of uncotrolled objects. These orbits have been
determined on the base of the motion theory elaborated at ITA RAS and
the osculating orbital data, published by the European Space
Operations Centre in 10 issues for 1992-1993 years. The improved
values of longitudes, rates of drift and angular elements permit to
calculate the ephemerides in 1-2 years ahead with accuracy up to
0.1-0.3 dgr.
This accuracy of the improved orbits depends on quality of the
orbits or observations used. The control calculations for the
resonant GEO 84 016a Raduga 14 have shown, that an improved averaged
orbit permits to represent photographic observations with accuracy up
to 1-2 min of arc at interval of 2000 days.
Thus the Catalogue of initial improved orbits and the theory of
GEO orbital evolution can be helpful in organizing the observational
program of the selected GEO. For instance, the program of
observations of exotic resonant GEO, which periodically change their
regimes of motion under the influence of luni-solar attraction, may
be ofinterest both as for geodesy (these satellites are very sensible
to accuracy of the geopotential parameters) and for a dynamic study
of these objects.