斯内利厄斯月谷

C.L.Chan

平時難得一見的斯内利厄斯月谷(Vallis Snellius), 長592公里, 在今晚(初五)較易辨認, 在圖中由9點位置伸延至4點半, 它是在月球的東南山區. UT: 2020/11/19, 10h30m, Telescope TEC Maksutov-Cassegrain MC200/20, D=20cm, F.L.=400cm, LosmandyG-11 Equatorial Mount with motor drive. Camera QHY 5III 224 Color Cam,  Shoot by FireCapture at Gamma=100, Gain=45, Expo= 0.4ms/frame, frame rate=20 frames/sec, RGB & avi format, stack and process 25% best frames in 1803 frames,­ with Software AstroStackert 3 withDSR, wavelet with RegiStax V.6,  final touch by GIMP & Microsoft photo. Atmospheric condition: Transparent: 8­/10, Seeing: 8/10, Equipment borrowed from Mr. Ng. The photo was taken at KennedyTown堅尼地城, Hong Kong.