Investigation of USNO‐A2.0 Catalog Positions
M. AssafinDepartamento de Astronomia, Observatório do Valongo, Universidade Federal do Rio de Janeiro, Rua Ladeira Pedro Antonio, 43, CEP 20080-090 Rio de Janeiro, RJ, BrazilA. H. AndreiObservatório Nacional, Rio de Janeiro, BrazilR. Vieira MartinsObservatório Nacional, Rio de Janeiro, BrazilD. N. da Silva NetoObservatório Nacional, Rio de Janeiro, BrazilJ. I. B. CamargoInstituto Astronômico e Geofísico, Universidade de Sao Paulo, Sao Paulo, BrazilR. TeixeiraInstituto Astronômico e Geofísico, Universidade de Sao Paulo, Sao Paulo, BrazilP. Benevides‐SoaresInstituto Astronômico e Geofísico, Universidade de Sao Paulo, Sao Paulo, Brazil
2001en
ABI
Аннотация
We present an investigation of the USNO-A2.0 Catalog positions. We have compared USNO-A2.0 positions with the Astrographic Catalogue-Tycho, with improved HST Guide Star Catalog positions in the ACT frame, and with International Celestial Reference Frame source positions and observational data from Valinhos CCD Meridian Circle, covering all the USNO-A2.0 magnitude range within 7 ≤ V ≤ 22. We report striking, peculiar features first found for the USNO-A2.0 catalog positions, which are different for its northern and southern parts.
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