Extending the very long baseline interferometry celestial reference frame to the southern hemisphere

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 f...

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Bibliographic Details
Published in:The Astronomical journal 1993, Vol.105 (1), p.353-359
Main Authors: ROBERTSON, D. S, CARTER, W. E, RAY, J. R, DILLINGER, W. H, NICOLSON, G. D, MCCULLOCH, P. D, HAMILTON, P. A, SEEGER, H
Format: Article
Language:English
Subjects:
Astrometry and reference systems
Astronomy
Earth, ocean, space
Exact sciences and technology
Fundamental astronomy
Fundamental astronomy and astrophysics. Instrumentation, techniques, and astronomical observations
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Summary: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. (Author)
ISSN:0004-6256
1538-3881
DOI:10.1086/116434