This database contains data for 3,649 galaxies in the Coma Supercluster, in the Virgo, Cancer, A262, A2147, A2151, A2197 and A2199 clusters. It is produced by the University of Milano-Bicocca.
A database of 110 nebulae and star clusters based on the work of 18th-century French astronomer Charles Messier (1730–1817). Students for the Exploration and Development of Space (SEDS).
SIMBAD contains basic data, cross-identifications, bibliographic references and measurements for more than 5 million astronomical objects located outside the solar system. It is maintained by the Centre de Données astronomiques de Strasbourg.
VizieR is a tool for searching more than 19,000 astronomical catalogues and associated data. It is produced by the Centre de Données astronomiques de Strasbourg.