隕坑像個大浴缸

C.L.Chan

圖中最大的隕坑像個大浴缸, 下面的地形狀似缸中的流水滿溢, 因此被命名為洗澡時, 悟出如何量度不規則物件體積的阿基米德. Archimedes, UT 2020/10/26: 12h21m, 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=38,Expo= 0.3ms/frame, frame rate=20 frames/sec, RGB & avi format, stack andprocess 50% best frames in 1803 frames,­ with Software AstroStackert 3 withDSR, wavelet with RegiStax V.6,  finaltouch 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.