Catalogue of Reference Stars for Observation of Extragalactic Radio Sources of the Northern Sky

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Compiled catalogue of more than 12000 reference stars of 10-16 magnitude was obtained for 190 fields of the northern sky with center in the ERS for realization of optical CCD-observations of astrometric extragalactic radio sources (ICRF ERS) with the purpose of their connection to VLBI-observations (ICRS). Some differential catalogues of reference stars around extragalactic radio sources obtained from photographic and CCD-observations by different observatories were considered. Photographic observation fields around of 74 ERS were made in Pulkovo Observatory, observations around 115 ERS were made in the Observatory of Kiev University, observations around 188 ERS were made in Romanian National Observatory at Bucharest. 208 fields around ERS were obtained in Nikolaev observatory at the telescope with CCD-camera. All observations are carried out during one decade, in 90's. The comparisons were made for positions of common stars of the compiled catalogue with the same of stars from UCAC2 (up to 50 for declination) and from the Carlsberg catalogue CMC13 (up to + 30 for declination) using of proper motions of stars from the catalogue UCAC2. For majority of chosen fields from the compiled catalogue the mean external accuracy was about 0.05-0.08". The internal accuracy of positions on both coordinates was not worse than 0.10". The systematic deviations either are away or insignificant. All positions of stars in the compiled catalogue are given both for stars with chosen from UCAC2 by proper motions on epoch and equinox J2000.0 and for remaining ones on epoch of observation.

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