A&A 393, 331-337 (2002)
DOI: 10.1051/0004-6361:20020989
Estimation of zonal errors in star catalogs using CCD observations of ICRF sources
A. Fienga1 and A. H. Andrei21 Institut de mécanique céleste et de calcul des éphémérides - Observatoire de Paris, EP 1825 CNRS, 77 avenue Denfert-Rochereau, 75014 Paris, France
2 Grupo de Estudos em Astronomia-OV/UFRJ and Observatório Nacional/MCT, R. Gal. José Cristino 77, S. Cristovão, R. Janeiro, Brasil
(Received 10 April 2002 / Accepted 2 July 2002)
Abstract
38 optical counterparts of ICRF sources were observed and positions were deduced using USNO A2.0 stars and stars extracted
from the preliminary version of the GSC II catalog, named GSC2.2. These positions were compared to the ICRF positions, and
to other published positions of the same optical counterparts. A significant distortion of the USNO A2.0 catalog is revealed
for stars fainter than the 11th magnitude and with declinations from 0 to 20 deg. On the other hand, the preliminary version
of the GSC II catalog shows a very good external accuracy and a good homogeneity in right ascension and declination for the
observed zones.
Key words: astrometry -- catalogs
Offprint request: A. Fienga, fienga@bdl.fr
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