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Observations Relevant to the Improvement of the Fundamental System

Published online by Cambridge University Press:  14 August 2015

W. Gliese
W. Gliese*
Affiliation:
Astronomisches Rechen-Institut, Heidelberg, F.R. Germany

Abstract

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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 classfied 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°.

Type
Session A: Reference Systems
Information
Symposium - International Astronomical Union , Volume 61: New Problems in Astrometry , 1974 , pp. 31 - 32
Copyright
Copyright © Reidel 1974 

References

Fricke, W. and Gliese, W.: 1968, in Perek, L. (ed.), Highlights of Astronomy , D. Reidel Publ. Co., Dordrecht-Holland, p. 301.Google Scholar
Gliese, W.: 1970, in Luyten, W. J. (ed.), ‘Proper Motions’, IAU Colloq. 7, 146.Google Scholar