========================================================================== J/A+AS/115/75 Optical astrometry of Benchmark radio sources. III (Costa+, 1996) The following files can be converted to FITS (extension .fit .fit.Z .fgz) table1 table2 ========================================================================== Query from: http://vizier.u-strasbg.fr/cgi-bin/VizieR?-source=J/A+AS/115/75 ==========================================================================
drwxr-xr-x 25 cats archive 4096 Jan 29 2012 [Up] drwxr-xr-x 2 cats archive 4096 May 12 09:56 [TAR file] -rw-r--r-- 1 cats archive 471 Feb 25 1998 .message -r--r--r-- 1 cats archive 4934 Oct 26 2012 ReadMe -rw-r--r-- 1 cats archive 317 Sep 19 2007 +footg5.gif -rw-r--r-- 1 cats archive 2565 Mar 5 2008 +footg8.gif -r--r--r-- 1 cats archive 2524 Jan 30 1996 table1 -r--r--r-- 1 cats archive 615 Sep 7 1995 table2
Beginning of ReadMe : J/A+AS/115/75 Optical astrometry of Benchmark radio sources. III (Costa+, 1996) ================================================================================ Optical astrometry of Benchmark radio sources. III. Positions of 35 southern extragalactic radio sources with respect to the International Reference Stars catalogue. Costa E., Loyola P. <Astron. Astrophys. Suppl. Ser. 115, 75 (1996)> =1996A&AS..115...75C (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Radio sources ; QSOs ; Keywords: astrometry - radio continuum: stars - reference system - quasar: Q0523-570 Description: Optical positions, relative to the International Reference Stars catalogue (IRS), and therefore in the system of the FK5, have been obtained for the optical counterparts of 35 extragalactic radio sources south of delta +3deg. Many of these sources are being considered as possible Benchmark objects for the establishment of a quasi-inertial unified radio/optical reference frame. Precision levels better than 0.2" in both coordinates were achieved. A comparison with VLBI radio positions available for these sources is presented. We give evidence for a possible offset in RA between the radio and optical reference frames.
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