蛇谷
農曆十三是拍影在月球左/西邊的風暴洋上的月面特徵的日子, 首先是北面的蛇谷, 有兩個環形山, 阿利斯塔克 ,Herodous與它們附近的月溪組成一條眼鏡蛇的形像. 蛇谷隕坑的輻射紋也很明顯, 整個形呈奇特的長方形地貌,Crater Aristarchus and Herodotus,UT 2022 07 11,13h39m, Telescope TEC Maksutov-CassegrainMC200/20, D=20cm, Effective Focal Length= 4 meter, Losmandy G-11 EquatorialMount with motor drive. Camera QHY 5III 224 Color Cam, Capture withFireCapture, Shoot at Gamma=100, Gain=12, Expo= 3.3 ms/frame, 29 f/s, aviformat, stack and process 10% best frames in 1767 frames by free SoftwareAutoStakkert 3, wavelet with RegiStax V.6, iL=2, L1=19. Final touch byMicrosoft Photo software. Atmospheric condition: Transparent: 8/10, Seeing:7/10. Equipment borrowed from Mr. Ng. The photo was taken at Kennedy Town 堅尼地城, Hong Kong.
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