| Author(s): | Röser, S. |
| Title: | The System of the PPM Catalogue |
| 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. 469-478 |
| Year: | 1990 |
| Abstract: | The coordinate system of the Catalogue of Positions and Proper Motions (PPM) was constructed as an extension of the FK5 system to higher star densities and fainter magnitudes. Zonal deviations from the FK5 were minimised on scales of 7x7 square degrees via AGK3R and CMC catalogues. Compared with these catalogues, no magnitude equation was found for stars brighter than m(pg)=10.5. |
| Preprint issued: | |
| Remarks: |
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