Extension of the ICRF

Details Extension of the ICRF Extension of the ICRF

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001evga.conf..187m&link_type=abstract

Proceedings of the 15th Workshop Meeting on European VLBI for Geodesy and Astrometry. Institut d'Estudis Espacials de Catalunya,

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The ICRF is the current defining celestial reference frame and is a catalog of positions of extragalactic objects measured with VLBI. It was derived in 1995 and came into effect on 1 January 1998. Since then two additional catalogs have been produced. ICRF-Ext.1 includes additional data through April 1999 with 59 new sources. The VLBA Calibrator Survey, carried out 1994-1997, has an additional catalog of 1298 dual-frequency and 34 X-band only positions. Because of the atypical observing profile, the analysis of the VLBA survey was different from ICRF and ICRF-Ext.1, and unique systematic errors may be present. Observing and analysis activities to support the extension and refinement of the ICRF are continuing.

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