... (NED)¹ https://ned.ipac.caltech.edu/

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... IRAF² IRAF is distributed by the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation

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... APASS³ https://www.aavso.org

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... PanSTARRS⁴ https://catalogs.mast.stsci.edu/panstarrs/

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