... POSS/DSS

DSS is Digital Sky Survey distributed by Hubble Space Telescope Science Institute.

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...çay

The Nançay Radioastronomy Station is part of the Paris Observatory and is operated by the Ministère de l'Éducation Nationale and Institut des Sciences de l'Univers of the Centre National de la Recherche Scientifique.

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... LEDA)

LEDA is the acronym of Lyon-Meudon Extragalactic Database, http://leda.univ-lyon1.fr

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... NED

The NASA/IPAC Extragalactic Database (NED) is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.

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