The Second Extension of the International Celestial Reference Frame: ICRF-EXT.1

Details The Second Extension of the International Celestial Reference Frame: ICRF-EXT.1 The Second Extension of the International Celestial Reference Frame: ICRF-EXT.1

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....127.3587f&link_type=abstract

The Astronomical Journal, Volume 127, Issue 6, pp. 3587-3608.

Astronomy and Astrophysics

Astronomy

114

Astrometry, Catalogs, Galaxies: Quasars: General, Radio Continuum: Galaxies, Reference Systems, Techniques: Interferometric

Scientific paper

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 δ=-30°. 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.

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