Set of Identifications, Measurements, and Bibliography for Astronomical Data (SIMBAD)
SIMBAD -- Set of Identifications, Measurements, and Bibliography for Astronomical Data -- is operated by the Centre de Données astronomiques de Strasbourg (CDS) in France. SIMBAD is a bibliographic database of astronomical objects of interest outside the solar system such as stars, galaxies, interstellar/intergalactic medium sources, clusters of stars/galaxies, exoplanets, gravitational sources, transient events. For each object in its database, it provides its bibliography, fundamental data (astrometry, velocity/redshift, magnitudes), as well as collections of additional measurements dependent on object types such as velocities/redshifts, proper motions, parallaxes, spectral types. SIMBAD contains information for more than 12.5 million objects and is growing at about 1 million objects per year.