衛星呈圓形
這晚拍到衛星呈圓形, 而且有大小的差別. Jupiter andits satellites, 2021/08/21 UT: 13h07m,Telescope TEC Maksutov-Cassegrain MC200/20, D=20cm, F.L.= 400cm, Losmandy G-11Equatorial Mount with motor drive. Camera QHY 5III 224 Color Cam, frame size 1696x 304 px, Shoot at Gamma=80, Gain=16, Expo= 8 ms/frame, frame rate=30frames/sec, avi format, stack and process 5-% best frames in 6917 frames, withSoftware AutoStakkert 3, wavelet with RegiStax V.6, final tough by MicrosoftPhoto, Atmospheric condition: Transparent: 7/10, Seeing: 8/10. Equipmentborrowed from Mr. Ng. The photo was taken at Kennedy Town 堅尼地城, Hong Kong.調得大D, 暗D, 看到兩個衛星不單只是圓形, 而且大小不同, 還有顏色添, 上面有D黑點?20公分是否可以看到地形?大而近是 Ganymede Diameter=5268km, -2.1 Absolute magnitude.小且遠是 Europa, Diameter=3121km, -1.4 Absolute magnitude.
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