Astronomisches Rechen-Institut Heidelberg

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ARI-Heidelberg Mitteilungen Serie A, No. 216

Author(s): Walter, H.G.
Title: Corrections to the Luni-Solar Precession from Radio Positions of Extragalactic Objects
Source: In: Inertial Coordinate System on the Sky. Proc. IAU Symp. 141, Leningrad, USSR, 17-21 October 1989; J.H. Lieske, V.K. Abalakin (eds.), Kluwer, Dordrecht, p. 285-292
Year: 1990
Abstract: In an attempt of a realization of the radio reference frame a compilation catalogue of positions is derived from independent observation catalogues of extragalactic objects the coordinates of which had been determined by means of Very Long Baseline Interferometry. The compilation catalogue comprises 209 objects which are divided into a core consisting of 50 objects having mean positional accuracies of 0.5 milliseconds of arc (mas) and an extension with positional accuracies better than 2 mas. Comparison of this catalogue with an independent compilation catalogue led to confidence limits at the 1 mas level. The compilation catalogue is supposed to represent a static reference frame of fixed extragalactic points. As the epochs of the contributing observations span nearly 10 years it was tried to interpret the apparent motion of the fixed points recognizable in the observation catalogues as an effect of luni-solar precession. The pilot study points at a reduction of the conventional value of about 2 mas per year.
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