Proper Motions in Praesepe
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High-precision proper motions for 257 and 296 stars in a 90'x90' region centered on BD+20 2170 were obtained from seven plates taken with the Zo-se 40cm refractor (f=6895mm) in...
科研团队利用Zo-se 40厘米折射望远镜（焦距f=6895mm）拍摄的7张照相底片，为以BD+20 2170为中心的90角分×90角分天区内的257颗与296颗恒星获取了高精度天体自行（proper motion）数据，相关观测于……
