蛇谷隕坑的輻射紋

C.L.Chan

蛇谷隕坑的輻射紋也很明顯, 但有奇特的長方形地貌, Rays of Aristarchus, UT: 2020/10/31, 16h21m, Telescope TECMaksutov-Cassegrain MC200/20, D=20cm, F.L.=400cm, Losmandy G-11 equatorial mount with motor drive. Camera QHY 5III 224 Color Cam,  Shoot by FireCapture at Gamma=100, Gain=38, Expo= 0.3ms/frame, frame rate=20 frames/sec, RGB & avi format, stack and process 50% best frames in 1803 frames,­ with Software AstroStackert 3 withDSR, wavelet with RegiStax V.6,  final touch by Microsoft photo. Atmospheric condition: Transparent: 9­/10, Seeing:6/10, Equipment borrowed from Mr. Ng. The photo was taken at Kennedy Town堅尼地城, Hong Kong.