Astronomy and Astrophysics – Astronomy
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978s%26w....17..157w&link_type=abstract
Sterne und Weltraum, vol. 17, May 1978, p. 157-161. In German.
Astronomy and Astrophysics
Astronomy
Astrometry, Celestial Reference Systems, Radio Astronomy, Radio Interferometers, Very Long Base Interferometry, Astronomical Catalogs, Astronomical Maps, Radio Sources (Astronomy)
Scientific paper
The possibility of setting up a reference system of distant objects, some of which are observable by both optical and radio telescopes, others of which are observable only by radio telescope, is discussed. The accuracies in observations by short-baseline and very-long-baseline (VLBI) interferometry are taken into consideration. A map is given, showing the positions of 95 extragalactic radio sources, determined with accuracy of 0.02-0.05 arcsec by short-baseline interferometry. Another map shows 42 objects determined by VLBI. The sparse coverage of the southern sky is evident. A third map shows the positions of about 60 radio stars. The problem of choosing a zero point for right ascension of a radio astronomical reference system is discussed. One choice would be the vernal equinox, which can be derived by radio astronomical methods with the aid of artificial planet satellites emitting a radio beam or by laser ranging.
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