Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105..353r&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 105, no. 1, p. 353-358.
Astronomy and Astrophysics
Astronomy
17
Radio Sources (Astronomy), Reference Systems, Southern Sky, Very Long Base Interferometry, Astronomical Catalogs, Celestial Geodesy, Nasa Programs, Southern Hemisphere
Scientific paper
Geodetic VLBI measurements have been extended to the Southern Hemisphere using stations in South Africa, Tasmania, and Chile. These measurements enabled us to add a number of Southern Hemisphere radio sources to the catalog that defines the celestial reference frame. Positions have been determined for 81 radio sources ranging in declination from 78 deg N to 80 deg S with formal errors of a few tenths of a millisec of arc. Numerical experiments to determine the sensitivity of the estimated positions to systematic error sources such as atmospheric refraction variations indicate that they are roughly comparable in magnitude to the formal errors. Preliminary measurements of the total and correlated source flux densities at 2.3 and 8.4 GHz are presented for a subset of the sources in the Southern Hemisphere.
Carter William E.
Dillinger W. H.
Hamilton Peter A.
McCulloch P. D.
Nicolson George Duncan
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