Precise optical and radio astrometry of the quasar 1928 + 738

Details Precise optical and radio astrometry of the quasar 1928 + 738 Precise optical and radio astrometry of the quasar 1928 + 738

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..261d&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, Feb. 1987, p. 261-263.

Astronomy and Astrophysics

Astronomy

5

Astrometry, Astronomical Photography, Quasars, Radio Spectra, Visible Spectrum, Charge Coupled Devices, Extragalactic Radio Sources, Reference Stars

Scientific paper

Precise optical and radio positions of the quasar 1928+738 have been obtained in the FK4 system from direct photography and VLA astrometry. In addition, for the first time, precise astrometric positions have been obtained from CCD frames related to the FK4 system by faint reference stars derived from the photographic plates. The coincidence of the radio and optical emission makes this source a suitable candidate for the establishment of an extragalactic reference frame by optical and radio astrometry of compact extragalactic sources.

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