Precise equatorial coordinates of double and multiple systems : an astronomical support to the HIPPARCOS mission.

Abstract

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 table includes the index number, the name of the discoverer, binary component according to the designation by the Catalogue de Composantes d'etoiles Doubles et Multiples (CCDM), the magnitude of the components as given in the CCDM, epoch of observation, right ascension referred to the J2000.0 equinox, declination, position angle referred to the J2000.0 North Pole, angular separation, and DM and ADS numbers.