D. Mason, Brian; L. Wycoff, Gary; I. Hartkopf, William; G. Douglass, Geoffrey; E. Worley, Charles. «The Washington Double Star Catalog, 2001.0». Astrometry Department, U.S. Naval Observatory. Arquivado do original em 26 de junho de 2019
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D. Mason, Brian; L. Wycoff, Gary; I. Hartkopf, William; G. Douglass, Geoffrey; E. Worley, Charles. «The Washington Double Star Catalog, 2001.0». Astrometry Department, U.S. Naval Observatory. Arquivado do original em 26 de junho de 2019