衛星艾奧的影子
木星 , 衛星艾奧的影子投在木星上Jupiter, with shadow of Io , apparent radius 21.7 sec, 2018/04/10 HKT:04h00m,
Telescope TEC Maksutov-Cassegrain MC200/20, D=20cm, F.L.=400cm, Prime Focus, Losmandy G-11 Equatorial Mount with motor drive. Camera ASI 120MC CMOS Web Cam, frame size 640x480, Shoot at Gamma=50, Gain=56, Expo=10ms, 40 frames/sec, stack and process 237/1422 frames with Software RegiStax V.5, Lowest quality = 95%. get 90% Improvement. Color enhancement by Microsoft Photo. Atmospheric transparent : 7/10, Seeing : 7/10. Equipment borrowed from Mr.Ng. Taken at Kennedy Town 堅尼地城, Hong Kong.
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