Messier 21.
Cúmulo abierto (galáctico) en la constelación de sagittarius.
Coordenadas AR: 18:04:13,45 (hh:mm:ss) Dec: -22:29:24,2 (º:’:»)
Magnitud aparente: 5,90
Identificador ngc: 6531
WIKIPEDIA:
El Cúmulo abierto M21 (también conocido como Objeto Messier 21 o NGC 6531) es un cúmulo abierto en la constelación de Sagitario. Fue descubierto y catalogado por Charles Messier el 5 de junio de 1764. M21 es un cúmulo relativamente joven, con unos 4.6 millones de años de antigüedad y contiene 57 estrellas.
CRÉDITO IMÁGENES: Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS Web Site is http://www.sdss.org/. The SDSS is managed by the Astrophysical Research Consortium for the Participating Institutions. The Participating Institutions are the American Museum of Natural History, Astrophysical Institute Potsdam, University of Basel, University of Cambridge, Case Western Reserve University, University of Chicago, Drexel University, Fermilab, the Institute for Advanced Study, the Japan Participation Group, Johns Hopkins University, the Joint Institute for Nuclear Astrophysics, the Kavli Institute for Particle Astrophysics and Cosmology, the Korean Scientist Group, the Chinese Academy of Sciences (LAMOST), Los Alamos National Laboratory, the Max-Planck-Institute for Astronomy (MPIA), the Max-Planck-Institute for Astrophysics (MPA), New Mexico State University, Ohio State University, University of Pittsburgh, University of Portsmouth, Princeton University, the United States Naval Observatory, and the University of Washington.
