A catalogue is presented based on the radio positions of 436 extragala
ctic sources distributed over the entire sky. The positional accuracy
of the sources is better than 3 milliarcsec (mas) in both coordinates,
with the majority of the sources having errors better than 1 mas. Thi
s catalogue is based upon a general solution of all applicable dual fr
equency 2.3 and 8.3 GHz Mark-m VLBI data available through the end of
1993 consisting of 1,015,292 pairs of group delay and phase delay rate
observations. Details and positions are also given for an additional
124 objects that either need further observation or are currently unsu
itable for the definition of a reference frame. The final orientation
of the catalogue has been obtained by a rotation of the positions into
the system of the International Earth Rotation Service and is consist
ent with the FK5 J2000.0 optical system, within the limits of the link
accuracy. (C) 1995 American Astronomical Society.