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On the Tie of Astrometric Radio Sources to the FK4 System With Zenith Telescope ZTL-180 Observations

Published online by Cambridge University Press:  19 July 2016

E. Ya. Prudnikova
E. Ya. Prudnikova*
Affiliation:
Central Astronomical Observatory Pulkovo 196140 Leningrad, USSR

Abstract

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A programme of Talcott pairs has been compiled at Pulkovo in order to tie bright radio sources to the FK4 system. The programme includes FK4 stars and radio stars to mag 9 (Radio stars for astrometry, Abh. Hamb. Sternw., 1982). About 150 observations of 18 pairs were made during 1985-1989. The correction to the declination of a radio pair has been found as a difference between the “reference” latitude and the latitude derived from the observation of the radio pair. The value of the “reference” latitude was determined from observations of ordinary Talcott pairs. The standard deviation does not exceed 0.09 arcsec. A radio star can be tied to the FK4 with an accuracy not worse than 0.1 arcsec.

Type
Part 2: Pulkovo today
Information
Symposium - International Astronomical Union , Volume 141: Inertial Coordinate System on the Sky , 1990 , pp. 94
Copyright
Copyright © Kluwer 1990