三個環形山

C.L.Chan

靠近月面中央 , 有三個環形山永遠正對地球 , 直徑由大到小 , 由北到南 , 外形清晰易見 , 由上至下 : 托勒梅 , 阿方索 , 阿爾扎赫爾 .
Craters Ptolemaeus, Alphonsus , Arzachel . 2018/03 25 HKT: 23h07m. telescope : TEC Maksutov-Cassegrain MC200/20, D=20cm, F.L.=400cm, Prime Focus,Losmandy G-11 Equatorial Mount with motor drive. Camera ASI 120MC CMOS Web Cam, Shoot at 20 frames/sec, stack and process 612 in 658 frames with Software RegiStax V5 . Post process with Microsoft Photo software. Atmospheric Transparent : 8/10, Seeing : 6/10. Equipment borrowed from Mr.Ng. Taken at Kennedy Town堅尼地城, Hong Kong.