里伊塔月谷南端有一條未名月溪

C.L.Chan

在里伊塔月谷(Vallis Rheita L=445 km, W = 30 km) 在南端有一條幼且黑未名月溪, UT:2020/11/20, 11h34m, Telescope TEC Maksutov-Cassegrain MC200/20,D=20cm, F.L.=400cm, Losmandy G-11 Equatorial Mount with motor drive. Camera QHY5III 224 Color Cam,  Shoot by FireCaptureat Gamma=100, Gain=42, Expo= 0.4ms/frame, frame rate=20 frames/sec, RGB &avi format, stack and process 35% best frames in 1803 frames,­ with SoftwareAstroStackert 3 with DSR, wavelet with RegiStax V.6,  final touch by GIMP & Microsoft photo.Atmospheric condition: Transparent: 8­/10, Seeing: 7/10, Equipment borrowedfrom Mr. Ng. The photo was taken at Kennedy Town堅尼地城, Hong Kong.