Progress with a General Catalogue of Positions and Absolute Proper Motions Based on AGK 2, AGK 3 and the Astrographic Catalogue as Sources of Data

Extract

In Hamburg we have the catalogue AGK 3 and a revised AGK 2 for the declination zones +1° to +18°, +24° to +89° on magnetic tapes, in manuscript and on punched cards. The remaining zones are in preparation. At the present time (March 1970) the catalogue, on account of some deficiencies, is not in the proper shape for a universal publication. A. Günther and H. Kox (1970) since 1967 investigated the zones Greenwich, Rome-Vatican, Catania and Helsingfors of the Astrographic Catalogue (AC) using the AGK 2/3 data as source for reference stars’positions. The original rectangular coordinates x, y for each of the plates together with AGK2 numbers are on tapes. By applying the systematic corrections derived by Günther and Kox and by using the new, definitive plate constants derived in course of the work on the AC-zones the x, y can be transformed into spherical coordinates reffered to the equinox 1950.0 and in the FK4 system. This was done in the last few months, and arithmetic means were produced for the individual stars with AGK 2 numbers for reference number. Simultaneously the mean square errors (mse) were derived when two or more plates went into the means. Table 1 gives values for average values of the mse, as an example for always two observations.