... triplet

Based on observations made at the Observatório do Pico dos Dias (OPD), operated by the MCT/Laboratório Nacional de Astrofísica, Brazil.

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... ESO-MIDAS

MIDAS is developed and maintained by the European Southern Observatory.

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... NED

NASA/IPAC Extragalactic Database.

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... LEDA

Lyon-Meudon Extragalactic Database.

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... IRAF

IRAF is distributed by NOAO, which is operated by AURA Inc., under contract with the National Science Foundation.

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