Optical positions of compact extragalactic radio sources with respect to the Hipparcos Catalogue
Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
Send offprint request to: E. Costa
Accepted: 5 March 1998
Optical positions relative to the Hipparcos Catalogue, and therefore within the International Celestial Reference System (ICRS), have been obtained for the optical counterparts of 25 compact extragalactic radio sources (CERS) south of . Most of these sources are being monitored as Benchmark objects for the establishment of a unified extragalactic radio/optical reference frame. Precision levels as good as 0.1″ in both coordinates were achieved. A comparison with VLBI radio positions available for these sources is presented. A finding chart is given for the optical counterpart of Q 1937-101. To a limiting magnitude of , no optical counterpart was found for the source 1148-671.
Key words: astrometry / reference systems / radio continuum: galaxies
© European Southern Observatory (ESO), 1998