Accurate Astrometry of 22 Southern Hemisphere Radio Sources
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Author/Creator ORCID
Date
2003-12-03
Type of Work
Department
Program
Citation of Original Publication
Fey, Alan L, Ojha Roopesh, Jauncey David L, Johnston Kenneth J, Reynolds John E, Lovell James E. J, Tzioumis Anastasios K, Quick Jonathan F. H, Nicolson George D, Ellingsen Simon P, McCulloch Peter M, Koyama Yasuhiro, Accurate Astrometry of 22 Southern Hemisphere Radio Sources,https://iopscience.iop.org/article/10.1086/381957
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Public Domain Mark 1.0
This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
Public Domain Mark 1.0
This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
Subjects
Abstract
Milliarcsecond-accurate radio positions for 22 southern hemisphere extragalactic sources are reported. These
positions are derived from Mark III very long baseline interferometry observations made between 2003 February
and 2003 August. The results presented here supplement an ongoing project to increase the sky density of
southern hemisphere sources in order to better define the International Celestial Reference Frame and to provide
additional phase-reference sources with accurate positions for use in astrophysical observations. The positions
for all 22 sources are south of δ = -3° (positions for 10 of the sources are south of δ = -6°
) and represent the
largest group of new milliarcsecond-accurate astrometric positions for sources in this declination range since the
initial definition of the International Celestial Reference Frame. The reported positions have average formal
uncertainties of 0.5 mas in right ascension and 0.6 mas in declination