Aladin Sky Atlas
Aladin is an interactive software sky atlas allowing the user to visualize digitized astronomical images, superimpose entries from astronomical catalogues or databases.

Astrographic catalogue and AC 2000.2.
Washington , DC : U.S. Naval Observatory.

CDS service for astronomical catalogues. Strasbourg: Astronomical Data Center (CDS).
As of May 2002, provides access to "4367 catalogues…of which 3692 are available online"
  (as full ASCII or FITSfiles).

A southern galaxy catalogue: a catalogue of 5481 galaxies south of declination -17 degrees found on 1.2-m
Corwin, H. G., Vaucouleurs, A. de, & Vaucouleurs, G. H. de. (1985).
U.K. Schmidt IIIa-J plates. Austin : Dept. of Astronomy, University of Texas at Austin .

General Catalogue of Variable Stars
Sternberg Astronomical Institute, Moscow, Russia


Infrared Processing and Analysis Center

Third reference catalogue of bright galaxies (Vols. 1-3). New York : Springer.
Vaucouleurs, G. H. de, Vaucouleurs, A. de, Corwin, H. G., Buta, R. J., Paturel, G. & Fouqué,P. (1991).

NASA/IPAC Extragalactic Database (NED).
asadena, CA: Jet Propulsion Laboratory: California Institute of Technology

NASA National Space Science Data Center

SIMBAD astronomical database. Strasbourg, France: Centre de Données astronomiques de Strasbourg.
"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.”  from:

SkyView: the Internet’s virtual telescope.
NASA “SkyView is a virtual observatory on the Net generating images of any part of the sky at wavelengths in all regimes from radio to gamma-ray.”

Sloan Digital Sky Survey.
Survey to “map in detail one-quarter of the entire sky, determining the position and absolute brightnesses of more than 100 million celestial objects. It will also measure the distances to more than a million galaxies and quasars.”

Center for History of Physics
American Institute of Physics

Messier's nebulae and star clusters
Jones, K. G.

Level 5
A Knowledgebase for Extragalactic Astronomy and Cosmology
Griffith Observatory

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