Many of the stars have SAO designations from the Smithsonian Astrophysical Observatory Star Catalog; others are identified by ZC (Zodiacal Catalogue), TYC (Tycho-2), PPM (Positions and Proper Motions), or TAC (Twin Astrographic Catalog
Many of the stars are in the SAO Star Catalog; others are identified by their numbers in the Astrographic Catalog
-- Tycho (ACT), Tycho Reference Catalog (TRC), Positions and Proper Motions (PPM), Twin Astrographic Catalog
(TAC), or Hubble Guide Star Catalog (GSC).
This catalog is known as the Astrographic Catalog
Reference Stars, or ACRS.