The ACT Reference Catalog
The ACT Reference Catalog includes positions, proper motions and error estimates on the Hipparcos System (J2000.0) for epoch J2000.0. Photometric data (B and V) from Tycho are included, as well as cross references to the Tycho, AC 2000, Bonner Durchmusterung (BD), Cordoba Durchmusterung (CD), Cape Durchmusterung (CpD), Henry Draper (HD) and Hipparcos Catalogues.
To enable rapid access of specific stars in the catalog, WCSTools software numbers each star using its RA region number (0000-2330) and a five-digit star number within each region, separated by a decimal point. sact lists ACT stars by number or sky region. imact lists the ACT stars within an IRAF or FITS image with a world coordinate system defined in its header.