Precise optical positions of radio sources in the FK 4-system. II - Results from 28 sources on the northern hemisphere and a preliminary comparison of the optical-radio reference frame

Details Precise optical positions of radio sources in the FK 4-system. II - Results from 28 sources on the northern hemisphere and a preliminary comparison of the optical-radio reference frame Precise optical positions of radio sources in the FK 4-system. II - Results from 28 sources on the northern hemisphere and a preliminary comparison of the optical-radio reference frame

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...113..213d&link_type=abstract

Astronomy and Astrophysics, vol. 113, no. 2, Sept. 1982, p. 213-218. Deutsche Forschungsgemeinschaft

Astronomy and Astrophysics

Astrophysics

39

Astrometry, Astronomical Photography, Extragalactic Radio Sources, Radio Spectra, Reference Stars, Visible Spectrum, Astronomical Catalogs, Astronomical Coordinates, Northern Hemisphere, Spatial Distribution, Telescopes

Scientific paper

Precise optical positions of 28 optical counterparts of extragalactic radio sources in the northern hemisphere have been derived using different long focus telescopes. The source positions are referred to the FK 4-system by the AGK 3 RN reference star catalogue as a primary reference frame; a system of secondary reference stars of intermediate brightness mυ = 12-14 has been obtained from the 23-cm astrograph of the Hamburg Observatory.
A preliminary comparison of the optical and quasi absolute radio reference frame has been performed using a provisional averaged catalogue of radio positions. Significant systematic differences with local amplitudes up to 0".2 have been found, mainly in declination.

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