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The second realization of the ICRF with VLBI

Published online by Cambridge University Press:  01 October 2007

C. Ma
C. Ma*
Affiliation:
NASA Goddard Space Flight CenterCode 698, Greenbelt, Maryland, 20771, USA email: [email protected]
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Abstract

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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. Since then the number of geodetic/astrometric VLBI observations has tripled and the number of radio sources with astrometrically useful data has quadrupled. These data along with advances in modeling and estimation will be used to generate the next ICRF realization in the microwave band. Analysis of source position time series and source structure evolution will be used to select better “defining” sources. 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.

Keywords

astrometryreference systemscatalogssurveys
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 337 - 343
Copyright
Copyright © International Astronomical Union 2008

References

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