Optical astrometry of Benchmark radio sources. I.
Abstract
Optical positions, relative to either the Perth 70 or AGK3R catalogues, have been obtained for the optical counterparts of 26 extragalactic radio sources south of δ ~+12^deg^. Most of these sources have been selected by IAU Commission 24 to be used as benchmark objects for the establishment of a high-precision radio/optical reference frame. Precision levels better than 0.2" in both coordinates were achieved. Comparisons with independent optical surveys and with the radio positions available for these sources are presented.
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- November 1992
- Bibcode:
- 1992A&AS...96..183C
- Keywords:
-
- Astrometry;
- Extragalactic Radio Sources;
- Astronomical Catalogs;
- Celestial Reference Systems;
- Error Analysis;
- Very Long Base Interferometry;
- Astronomy