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Date and Time of the Query: 2019-05-21 T00:40:45 PDT
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For refcode 2004AJ....127.3587F:
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Copyright by American Astronomical Society. Reproduced by permission
2004AJ....127.3587F The Second Extension of the International Celestial Reference Frame: ICRF-EXT.1 A. L. Fey, C. Ma, E. F. Arias, P. Charlot, M. Feissel-Vernier, A.-M. Gontier, C. S. Jacobs, J. Li, and D. S. MacMillan Abstract. We use very long baseline interferometry data obtained between mid-1995 and the end of 2002 May together with older data to extend and revise the International Celestial Reference Frame (ICRF). Revised positions of ICRF candidate and "other" sources, based on inclusion of the additional data, are presented. Positions, in the frame of the ICRF, for an additional 109 new sources are also presented. All but four of the new sources are located north of {delta}=-30deg. Positions of the ICRF defining sources remain unchanged. We present a summary of current astrometric and geodetic observing programs and discuss the evolution and future of the ICRF. Keywords: Astrometry, Catalogs, Galaxies: Quasars: General, Radio Continuum: Galaxies, Reference Systems, Techniques: Interferometric
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