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Smithsonian Astrophysical Observatory Star Catalog. These files contain the entire SAO catalog of 258,996 stars, including B1950 positions, proper motions, magnitudes, and, usually, spectral types in a locally-developed binary format.
The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue. It was published by the Smithsonian Astrophysical Observatory in 1966 and contains 258,997 stars.[1][2][3] The catalogue was compiled from various previous astrometric catalogues, and contains only stars to about ninth magnitude for which accurate proper motions were known.
Edwin Hubble was one of the first astronomers to develop a scheme for classifying galaxies based on appearance. Since then, others have modified and expanded on the original scheme, but it is a good starting point for organizing my images of galaxies. The Hubble tuning fork diagram appears in the Hubble Atlas of Galaxies (by Allan Sandage, still available from the Carnegie Instituition of Washington) as a way of organizing the different galaxy classes.
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