Abstract
Optical positions relative to the International Reference Stars Catalogue (IRS), and therefore in the sys- tem of the FK5, have been obtained for the optical coun- terparts of 40 compact extragalactic radio sources south of +6. Many of these sources are being consid- ered as possible Benchmark objects for the establishment of a quasi inertial unied radio/optical reference frame. Precision levels as good as 0.1 00 in both coordinates were achieved. A comparison with VLBI radio positions avail- able for these sources is presented. We give new evidence for the existence of an oset in the origin of right ascension between the radio and optical reference frames as dened at present.
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