The relation between equatorial and radio interferometeric reference systems

Astronomy and Astrophysics – Astronomy

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Astronomical Catalogs, Celestial Bodies, Equators, Extragalactic Radio Sources, Radio Interferometers, Reference Systems, Coordinates, Vector Analysis

Scientific paper

Meridian-instrument observations can yield positions of celestial bodies only in the system of the instantaneous equator; hence these positions should be reduced to a fundamental, nonrotating system defined by a catalog of coordinates adopted for extragalactic radio sources. In principle, the orientation of the latter system may be specified at will, but for practical reasons its axes are best aligned as closely as possible with equatorial coordinate axes of some fixed epoch. Once a radio source catalog has been compiled, all reference to the original equatorial system may be dropped. Guinot's proposal to replace the vernal equinox by another, nonrotating fiducial point is discussed, as well as Aoki's criticism of that suggestion.

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