"Evidence of discrepany in determination of the residual rotation of
the FK5 system from worldwide optical observations of inner and outer
planets in the years 1960-1993"

Yu.B.Kolesnik, Institute of Astronomy, Moscow

Optical observations of the Sun, Mercury, Venus, Mars, Jupiter and
Saturn accumulated by 24 meridian instruments, 16 astrographs and 11
astrolabes during the period from 1960 to 1993 have formed the basic
material for analysis of residual rotation of the FK5 system
respectively the fundamental ephemeris DE200. The observations under
discussion have been referenced to improved positions and proper
motions of fundamental stars in the equatorial zone (the preliminary
N70E catalogue). The systematic differences N70E-FK5 will be
presented. The problem of residual rotation of presently existing
fundamental system of stellar positions in conjunction with inertial
mean motions of planets given by the ephemeris and adopted precession
quantities will be discussed in the light of the most actual
observational evidences.