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We report the discovery of visual double stars, mostly with separations between 0.3 and 1 arcsec, from a dedicated re–reduction of the Tycho data from the star mapper of the ESA Hipparcos satellite. The new doubles are combined with WDS systems identified in the Catalogue, and 1220 new doubles, to form the Tycho Double Star Catalogue, TDSC, a catalogue of absolute astrometry and BT, VT photometry for components of double and multiple star systems. We also include results for single components for systems unresolved in TDSC, and a supplement gives Hipparcos and data for 4777 additional components. The TDSC thus contains a total of entries. Cross identifications are given to WDS, HD, Hipparcos and .
Fabricius et al. (Fri,) studied this question.
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