A&A 422, 1105-1108 (2004)
Representation of the International Celestial Reference System (ICRS) by different sets of selected radio sourcesE. F. Arias1 and S. Bouquillon2
1 Bureau International des Poids et Mesures, Pavillon de Breteuil, 92312 Sèvres Cedex, France
2 Observatoire de Paris - SYRTE, 66 Av. de l'Observatoire, 75014 Paris, France
(Received 24 July 2003 / Accepted 17 November 2003)
To contribute to the maintenance and extension of the ICRF, we have studied representations of the ICRS by different sets of selected radio sources. The axes of the ICRS are realized by the coordinates of 212 sources in the ICRF qualified as the "defining" objects of the frame. They have been selected by the WGRF of the IAU by applying quality criteria to VLBI observations from 1975-1995. A different selection of sources has been proposed by Feissel-Vernier based on an analysis of time series of radio source coordinates over the period 1989-2002. We compare the quality of the realization of the ICRS by the two sets of selected sources.
Key words: reference systems -- techniques: interferometric
© ESO 2004