The catalog was also distributed in a set of 4 DVD-ROMs. In 2001, a catalog identifying over 89 million objects on the NGS-POSS was placed online as part of the Minnesota Automated Plate Scanner Catalog of the POSS I. In 1996, an even more compressed version, RealSky, was marketed by the Astronomical Society of the Pacific. The Digitized Sky Survey was made available on a set of 102 CD-ROMs, and can also be queried through several web interfaces. ![]() The resulting digital images were compressed and published as the Digitized Sky Survey in 1994. Eight years later, the scanning of the original NGS-POSS plates was completed. In 1986, work was begun on a digital version of the NGS-POSS. Innumerable astronomical objects were discovered by astronomers studying the NGS-POSS photographs. Abell Catalog of Planetary Nebulae), which was used for decades for purposes of cataloging and categorizing celestial objects, especially in studies of galaxy morphology. Many astronomical catalogs are partial derivatives of the NGS-POSS (e.g.
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