Progress in the 2nd realization of ICRF

Details Progress in the 2nd realization of ICRF Progress in the 2nd realization of ICRF

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jsrs.meet....3m&link_type=abstract

"Proceedings of the "Journées Systèmes de Référence Spatio-temporels 2007". Observatoire de Paris, 17-19 September 2007. Editor:

Astronomy and Astrophysics

Astronomy

Scientific paper

The ICRF derived from VLBI observations of extragalactic radio sources up to 1995.6 and effective since 1998.0 was a radical change from the FK5 stellar/equinox celestial system. The number of geodetic/astrometric VLBI observations has since tripled and the number of radio sources with astrometrically useful data has quadrupled. A systematic program for monitoring astrometric sources has been established although the available observing capability limits this to only a fraction of all such sources. Advances in modeling, generation of source position times series, and greater availability of source structure information will permit the identification of better “defining” sources. The VLBA Calibrator Survey will provide a large number of additional sources although most are observed at only one epoch. Working groups have been established by the IAU, IERS and IVS with the goal of presenting the second realization of the ICRF at the IAU General Assembly in 2009.

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