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Precise equatorial coordinates of double and multiple systems : an astronomical support to the HIPPARCOS mission.
Pannunzio, R.; Lattanzi, M. G.; Morbidelli, R. +3 more
Results are presented on determinations of precise positions (to the accuracy required for their possible inclusion in the Hipparcos Input Catalogue) of 623 double and multiple stars (126 of them newly discovered) from the measurement of 39 plates taken at the ESO and the Astronomical Observatory of Torino, obtained between 1984 and 1987. The tabl…
On zenith-distance variations of the Borowiec astrolabe
Lehmann, M.; Wiktorowski, J.
Systematic differences between zenith distances of two groups of stars observed successively during the same night occur in observations carried out with the Danjon Astrolabe in Borowiec. Four suggestions for the determination of an additional parameter correlated in the best way with the observed variations of zenith distance are made. The best c…