Astronomisches Rechen-Institut Heidelberg

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ARI-Heidelberg Mitteilungen Serie A, No. 92

Author(s): Fricke, W.
Title: Definition of the Celestial Reference Coordinate System in Fundamental Catalogues
Source: In: On Reference Coordinate Systems for Earth Dynamics. Proc. IAU Colloq. 26, Torun, Poland, 26-31 August 1974; B. Kolaczek, G. Weiffenbach (eds.), Inst. Geodesy and Geodetical Astron., Technical University, Warsaw, p. 201-222 Poland
Year: 1975
Abstract: The celestial reference coordinate system in fundamental catalogues is defined by the position of the celestial equator as the fundamental plane, the vernal equinox as zero point for reckoning right ascensions, and by adopted values of precession. Discussed are (1) the methods which, in practice, provide the equator, equinox and precession, (2) the prospects of progress in the direction of higher accuracy, (3) the realization of a homogeneous system on the sky, and (4) the extension of the system to a reference frame represented by extragalactic objects. The basic observational material available for the project of an improvement of the Fourth Fundamental Catalogue (FK4) is discussed, and the plan of establishing FK5 is outlined.
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