The open cluster NGC 2287 is a cluster apparently rich in multiple stars and several other spectroscopically interesting objects. The authors report the first extended proper-motion membership survey of the cluster. UBV photometry of 146 proper-motion stars is also included and compared to earlier data. Color-magnitude and two-color diagrams are presented. The proper-motion-based membership probabilities indicate that most of the spectroscopic binaries are members of the cluster, as are the three Hg-Mn stars, and at least four of the K giants. The bright He-weak star HD 49333 does not appear to be a cluster member. A ZAMS fit to a color-magnitude diagram of the most likely members gives a distance modulus of (m-M) = 9.15.
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Ianna et al. (1987) studied this question.