A

David

Darling

Smithsonian Astrophysical Observatory Catalog (SAO Catalog)

The Smithsonian Astrophysical Observatory Catalog (SAO Catalog) is a catalogue of 258,997 stars, mostly down to magnitude 8.5 plus a few dimmer stars, published by the Smithsonian Astronomical Observatory in 1966. It identifies objects in the form: SAO ####; for example, Vega is listed as SAO 67174.