A comparison between accurate radio and optical positions for six Southern Hemisphere extragalactic sources

Details A comparison between accurate radio and optical positions for six Southern Hemisphere extragalactic sources A comparison between accurate radio and optical positions for six Southern Hemisphere extragalactic sources

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98...49j&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, July 1989, p. 49-53. Research supported by the University of Sydney and Rothmans

Astronomy and Astrophysics

Astronomy

14

Astronomical Coordinates, Extragalactic Radio Sources, Radio Astronomy, Southern Hemisphere, Very Long Base Interferometry, Visible Spectrum, Astronomical Catalogs, Position (Location), Reference Stars

Scientific paper

Radio positions measured on a 275 km baseline are given for six extragalactic sources south of declination -45°. The measurements were made using very long baseline interferometry (VLBI) at 2.3 and 8.4 GHz between the 64 m antennas at Parkes and Tidbinbilla, Australia. Positions with accuracies of ±0.11 arcsec in right ascension and ±0.08 arcsec in declination are given with respect to the JPL VLBI reference frame. This program is a first step in establishing an accurate radio reference frame in the mid-latitude to polar regions of the southern hemisphere. Accurate optical positions have also been determined from glass plate copies of the ESO B Schmidt atlas using reference stars from the Perth 70 catalog. A comparison between the optical and radio positions yields mean differences (optical - radio) of -0.02 ± 0.09 and 0.05 ± 0.13 arcsec in right ascension and declination, respectively. On average, the optical reference frame south of -45°, the FK4 as defined by the Perth 70 catalog, and the VLBI radio reference frame as defined by the present six sources, appear to be consistent at the tenth of an arcsecond level.

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