oa MNASSA : Monthly Notes of the Astronomical Society of South Africa - Clusters and associations



Since Sir John Herschel published positions of 100 stars in this cluster from his micrometer observations (1834-38) a number of attempts have been made to detect differential motions of individual stars (W. C. Russell, 1872; Gould, 1882; Nangle, 1908). The only published photographic observations known to the writer are those by Gould (Cordoba Resultados Vol. 19).


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