Astrometry of Fundamental Catalogues: The Evolution from by Hans G. Walter,Ojars J. Sovers

By Hans G. Walter,Ojars J. Sovers

Celestial basic catalogues are a prerequisite for the selection of absolute positions and motions in area. shortly, positional astrometry is on the watershed among classical basic catalogues, in line with relocating reference stars, and sleek catalogues, according to extragalactic reference items with non-measurable movement. This publication addresses the techniques and techniques of the respective building options resulting in the stellar body of the FK5 (fifth primary catalogue) and to the newly followed extragalactic radio reference body, ICRF (international celestial reference frame), with its extension to optical wavelengths by means of the Hipparcos Catalogue. whereas relevant outlines of meridian circle observations are given, emphasis is installed a few aspect at the VLBI strategy as utilized to astrometry, and to the observational recommendations utilized in the Hipparcos venture, together with the tie of the initially non-anchored inflexible Hipparcos sphere into the ICRF.

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