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The Hyades supercluster in the FK5

The members of the Hyades supercluster brighter than about M V = +4 mag and contained in the FK5, or having nearly FK5 quality proper motions, show a convergent point of (A, D) = (6 h, +6.5°). The Hyades cluster stars in the FK5 have a mean distance of 46.7 pc (modulus = 3.35 mag). The supercluster, as well as the Hyades and Praesepe cluster, populations represent at least three age groups. Because of difficulties with the temperature-to-color conversion, and the possibility that the stellar cores have convective overshoot, precise dating is impossible but, presumably, these problems will not affect differential age determinations