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.