Astronomisches Rechen-Institut Heidelberg

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ARI-Heidelberg Mitteilungen Serie A, No. 84

Author(s): Gliese, W.
Title: Observations Relevant to the Improvement of the Fundamental System
Source: In: New Problems in Astrometry, Proc. IAU Symp. 61, Perth, Australia, 13-17 August 1973; W. Gliese, C.A. Murray, R.H. Tucker (eds.), Reidel, Dordrecht, p. 31-32
Year: 1974
Abstract: Since 1950 about 150 observational catalogues have become available which may contribute to the improvement and extension of the FK4. Twenty-five of these have been classified as 'absolute' or 'quasi-absolute' by their authors. Part of the observations, however, are not yet available in publications or in a form suited for data processing. Some of the absolute observations in R.A. suffer from insufficient determination of the azimuth and others in Decl. from unclear elimination of flexure. Main deficiencies in the system of the FK4 are inaccurate positions and proper motions in right ascensions south of -35 degrees.
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