三兄弟, 由大至小

C.L.Chan

三兄弟, 由大至小 : 托勒密, 阿耳豐斯, 阿爾扎赫. 因他們在月中子午線上, 頂視照就看得很清楚 .

Three Brothers, 2019/11/05 HKT: 19h19m,Telescope TEC Maksutov-Cassegrain MC200/20, D=20cm, F.L.= 400cm, Losmandy G-11Equatorial Mount with motor drive. Camera QHY 5III 224 Color Cam, frame size1280 x 960 px, Shoot at Gain=40, Expo= 0.6ms/frame, Gamma=112, frame rate=25-117frames/sec, avi format, stack and process 28% best in 2273 frames, withSoftware AutoStakkert 3 , wavelet with RegiStax V.6 , Atmospheric condition :Transparent : 8/10, Seeing : 6/10. Equipment borrowed from Mr. Ng. Photo takenat Kennedy Town 堅尼地城, Hong Kong.