On the long-period evolution of orbits of geostationary objects

                           R. I. Kiladze

     At the Institute of theoretical  astronomy  (St.-Peterburg)  the
method  and  software  have  been created for the  calculation of the
ephemerides of  the geostationary  objects  (GEO)  for the  long time
intervals. The perturbations from the geopotential and the luni-solar
attraction have been taken into the consideration.
The software has  been used for the calculation of orbital evolutions
of some hundreds objects. The  results of comparison with real orbits
have shown the satisfactory accuracy.
Software  allows calculate the orbital evolution of  GEO  for several
ten-years with accuracy of 1-2 min of arc.  Calculations for one year
time interval take from 1 to 5 sec of   PC IBM-386.