又名蛇谷

C.L.Chan

阿里斯塔克, 又名蛇谷, Crater Aristachus, . UT2021 11 18, 13h33m, Telescope TEC Maksutov-Cassegrain MC200/20, D=20cm, TeleVue 2,5x Barlow lens, Total Focal Length=10 meter, Losmandy G-11 EquatorialMount with motor drive. Camera QHY 5III 224 Color Cam, Capture withFireCapture, Shoot at Gamma=100, Gain=21, Expo= 4.9 ms/frame, 29 f/s, aviformat, stack and process 10% best frames in 1793 frames by free SoftwareAutoStakkert 3, wavelet with RegiStax V.6, iL=2, L1=30, L2=0.  Final touch by Microsoft Photo software.Atmospheric condition: Transparent: 8/10, Seeing : 8/10. Equipment borrowedfrom Mr. Ng. The photo was taken at Kennedy Town 堅尼地城, Hong Kong.