Set of Identifications, Measurements, and Bibliography for Astronomical Data (SIMBAD)
The Set of Identifications, Measurements, and Bibliography for Astronomical Data (SIMBAD), created and maintained by the CDS, Strasbourg, brings together basic data, cross-identifications, observational measurements, and bibliography, for celestial objects outside the solar system: stars, galaxies, and nonstellar objects within our galaxy, or in external galaxies. SIMBAD contains information for about 1 million objects, for which 3.3 million identifiers, more than 1.5 million observational measurements and 1.4 million bibliographical references are available.