Site Link
  NASA Astrophysics Data System
  NASA/IPAC Extragalactic Database
  National Physical Laboratory
  Simbad data
  Sloan Digital Sky Survey
  Stellarium Planetarium [v 0.10.2]
  Strasbourg Astronomical Data Centre
  Vizier - Astronomical Catalogues
  http://tdc-www.harvard.edu/astro.data.html
Smithsonian http://tdc-www.harvard.edu/astro.data.html