Complete text (abstract only):
The San Fernando Zone of the Astrographic Catalogue has been reduced, using a specific reduction model, with the Hipparcos Catalogue as reference system. Magnitude and color-dependent terms are included, making use of photometric data from the Hipparcos and Tycho catalogues. Contact copies of some of the original plates were made, and these were measured with the PDS plate scanner of the CIDA observatory in Merida, Venezuela. Comparison of these measurements with the original measurements show that no appreciable emulsion deformation was introduced during the long storage of the original plates, or by the copying process.
Bibliographical details:
Carlos Abad: Reduction and quality testing of the San Fernando Astrographic Catalogue plates. In: Peter Brosche, Wolfgang R. Dick, Oliver Schwarz, Roland Wielen (Eds.): The Message of the Angles - Astrometry from 1798 to 1998. Proceedings of the International Spring Meeting of the Astronomische Gesellschaft, Gotha, May 11-15, 1998. (Acta Historica Astronomiae ; 3). Thun ; Frankfurt am Main : Deutsch, 1998, p. 146.
Html-Version: Wolfgang R. Dick. Created: 21 Jan 1999