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A preliminary list of stars from TYCHO observations

Bastian, U.; van Leeuwen, F.; Petersen, C. +6 more

The final Tycho Catalog will be a major source of astrometric standard stars when it will be published, in 1997. While the Tycho positions with their full accuracy will only be available at the end of the data reduction, it is already possible to derive a preliminary list of about one million stars from the Tycho Input Catalogue (TIC) which have a…

Global astrometry of HIPPARCOS double stars within the FAST consortium

Bernstein, H. -H.

This paper describes the methods of the determination of the parameters of the global astrometry of double stars from HIPPARCOS observations as prepared within the task 6000 of the FAST consortium. The capability of the basic parts of the procedures are tested by comparisons with the single star treatment.