This database is based on the electronic version of the SAO catalog from the Astronomical Data Center, which is itself based on an original binary version of the Smithsonian Astrophysical Observatory Star Catalog (SAO, SAO Staff 1966). Subsequent improvements by T. A. Nagy (1979) included the addition of cross-identifications from the Table of Correspondences SAO/HD/DM/GC (Morin 1973). As a prelude to creation of the 1984 version of the SAO, a new version of the SAO-HD-GC-DM Cross Index was prepared (Roman, Warren, and Schofield 1983). The 1984 version of the SAO contained the corrected and extended cross identifications, all errata published up to January 1984 and known to the ADC, numerous errors forwarded to the ADC by colleagues, and errors discovered at the ADC during the course of this work. Clayton A. Smith of the U. S. Naval Observatory provided J2000.0 positions and proper motions for the SAO stars. Published and unpublished errors discovered in the previous version (1984) have been corrected (up to May 1991).
For this representation, some parameters such as the RA and Dec in radians have been omitted.
53 entries marked as duplicates were removed from the HEASARC online version of the SAO Catalog. The SAO numbers of these deleted duplicates are as follows:
SAO 9949 SAO 24671 SAO 31219 SAO 58906 SAO 67452 SAO 92316
SAO 96663 SAO 100161 SAO 106477 SAO 133461 SAO 142402 SAO 172631
SAO 180619 SAO 181584 SAO 186717 SAO 192426 SAO 193213 SAO 193858
SAO 193896 SAO 201604 SAO 210293 SAO 210294 SAO 215182 SAO 216112
SAO 217746 SAO 218092 SAO 218513 SAO 219513 SAO 222076 SAO 222287
SAO 224194 SAO 225327 SAO 226938 SAO 227039 SAO 228027 SAO 228854
SAO 229059 SAO 229831 SAO 231638 SAO 231703 SAO 232935 SAO 234389
SAO 235962 SAO 235973 SAO 236668 SAO 238177 SAO 238511 SAO 240305
SAO 241167 SAO 241172 SAO 242605 SAO 242962 SAO 246009
SAO Catalog Documentation at HEASARC