Astronomisches Rechen-Institut Heidelberg

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ARI-Heidelberg Mitteilungen Serie A, No. 1

Author(s): Kopff, A.
Title: Remarks on the revision of FK3 and its relation to N30
Source: Mon. Not. R. Astron. Soc. 114, No. 4, 478-489
Year: 1954
Abstract: In the first part of the paper the principles adopted for the revision of FK3 are explained. About 57 catalogues with epochs between 1918 and 1950 are to be used, including both those with independent instrumental systems and those tied by differential observations to the system of a fundamental catalogue. For the improvement of the position of each individual star in the system of FK3 all the catalogues are used; the method of correcting position and proper motion is that given by Boss in the P.G.C. For the correction of the system FK3 itself only the independent catalogues can be used. The second part gives a comparison between FK3 and N30, shown by the tables at the end of the paper. Using the system of the G.C. as a basis of comparison, it is found that there are some systematic differences in the N30 system between those stars which are in the FK3 catalogue and those which are not, particularly in two zones of declination. The differences are shown in Tables I-IV. A satisfactory explanation of this difference cannot be given.
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