Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990dres.iafcq....w&link_type=abstract
IAF, International Astronautical Congress, 41st, Dresden, Federal Republic of Germany, Oct. 6-12, 1990. 6 p.
Astronomy and Astrophysics
Astronomy
Astrometry, Astronomical Coordinates, Extragalactic Radio Sources, Hipparcos Satellite, Radio Astronomy, Radio Stars, Reference Stars, Sky Surveys (Astronomy), Stellar Motions
Scientific paper
Methods are proposed for connecting the Hipparcos net to a fundamental system treated with emphasis on the radio reference frame represented by extragalactic objects. The optical approach is described and details are provided for the radio approach that offers the advantage of a direct link through the intermediaries of radio stars. The potential as well as the limitations of using radio stars as fiducial points in this method are discussed. Finally, a prototype of a radio reference frame is derived from the currently available individual observation catalogues. This prototype consists of approximately 50 objects principally in the Northern Hemisphere having averaged accuracies in right ascension and declination of 0.5 milliseconds of arc.
Walter Hans G.
Xu Tongqi
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