Rupes Recta & Rima Birt

C.L.Chan

風大雲飄之夜, 把錄影時間延長至1分鐘, 幸運的捕捉到直壁西邊的 Rima Birt (L=50km).

直壁, 是指照片自上而下的一道黑線,早前以為是一峭壁. 後來的觀測弄清楚是一道長110km, 寬2-3km, 高240-300m的正斷層,斷層面與水平夾角約10度 . 成因是左邊雲海黑色的玄武岩漿漫蓋了一個180km直徑的無名隕坑,之後在坑中就生成這條正斷層.

Rupes Recta & Rima Brit on the Moon, 2019/10/08 HKT: 21h06m,Telescope TEC Maksutov-Cassegrain MC200/20, D=20cm, F.L.= 400cm, LosmandyG-11 Equatorial Mount with motor drive. Camera QHY 5III 224 Color Cam,frame size 1296 x 1000 px, Shoot at Gamma=112, Gain=40, Expo= 0.45ms/frame, framerate=27 frames/sec, avi format, stack and process 50% best frames in 2000frames,­ with Software AstroStackert 3 , wavelet with RegiStax V.6 , finaladjustment by Microsoft Photo,   Atmospheric condition : Transparent : 7/10,Seeing : 7/10. Equipment borrowedfrom Mr. Ng. Photo taken at Kennedy Town堅尼地城, Hong Kong.