Berkeley 93 RVB photometry

While performing galactic and extragalactic studies near the galactic plane in Cepheus. CCD frames in B, V, and R were taken of the faint (V>=16m), previously unstudied open...在仙王座（Cepheus）天区银道面（galactic plane）附近开展银道天体与河外天体研究期间，科研人员针对视星等V≥16等的暗弱、此前尚未被研究过的open……天体，获取了B、V、R三个波段的CCD（Charge-Coupled Device）成像帧。