A deep proper-motion survey of the nearby open cluster Blanco 1ltlink href

We provide two comprehensive catalogues of positions and proper motions in the area of open cluster Blanco 1. The main catalogue, CtlgM, contains 6271 objects down to V∼ 18.5 and covers a circular ∼11 deg 2 area. The accuracy of CtlgM proper motions, at about 0.3-0.5masyr -1 for well-measured stars, permits an excellent segregation between the cluster and field stars. The vector-point diagram of proper motions indicates an estimated total of ∼165 cluster members among the stars in our sample, while 314 stars with σ μ