Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...305..989u&link_type=abstract
Astronomy and Astrophysics, v.305, p.989
Astronomy and Astrophysics
Astrophysics
8
Catalogs, Astrometry, Methods: Data Analysis
Scientific paper
The U. S. Naval Observatory is in the process of making new reductions of the Astrographic Catalogue using a modern reference star system, the ACRS, created specifically for that purpose. The application of that system to the plates of the Cape Zone is discussed as well as the software that has been developed to make the reductions. An analysis of scale, rotation, tilt, coma, magnitude equation, radial distortion and distortions introduced by the use of reseaux in the Carte du Ciel program is made for each plate. The result is a catalog of 544629 stars from plates taken at the Cape Observatory between 1897 and 1911 on the system of FK5 J2000. The average standard deviations of an individual plate image after reduction are 0.31" in right ascension and 0.28" in declination. Thus the positions of the Cape Zone, and of the other zones subsequently to be reduced, can be combined with modern astrometric catalogs to give accurate proper motions for large numbers of stars.
Corbin Thomas E.
Urban Sean E.
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