The Moving Cluster in Perseus.

The visual clustering around a Persei is examined. This supergiant and twenty-five other stars of types B3-A2 appear to be members of a cluster, about 180 parsecs from the sun, which is moving with a velocity of 16 km/sec toward 1 = 215 and b = +17 . There is no evidence of an appreciable number of fainter cluster members. Five other stars within 35 parsecs of a Persei may also share the cluster motion, but the evidence is not conclusive.