阿爾泰斷崖 2019 10 16

C.L.Chan

阿爾泰斷崖(照片由上至下彎彎的一道弧, 佔全照片的高度約5份之4)是月球上最長的峭壁 , 長427 km, 高1 km, 成因可能是酒海的外環殘壁.

Rupes Altai, length =427km, height = 1 km, 2019/10/16 HKT: 22h36m,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 Gamma=112, Gain=6, Expo=0.1ms/frame, frame rate=50-107 frames/sec, avi format, stack and process 45%best frames in 1390 frames, with Software AutoStakkert 3 , wavelet withRegiStax V.6, final tough by Microsoft Photo, Atmospheric condition :Transparent : 8/10, Seeing : 7/10. Equipment borrowed from Mr. Ng. Photo takenat Kennedy Town 堅尼地城, Hong Kong.