艾奧的影投在木星上

C.L.Chan

木衛一, 艾奧的影投在木星上 , 木星視半徑 21.3秒 , (今年5月中旬最大為22.4秒)

Io and Jupiter, apparent radius 21.3 sec,  2018/04/03 HKT:01h50m,

Telescope TECMaksutov-Cassegrain MC200/20, D=20cm, F.L.=400cm, Prime Focus, Losmandy G-11Equatorial Mount with motor drive. Camera ASI 120MC CMOS Web Cam, frame size512x440, Shoot at 20 frames/sec, stack and process  709 in 727 frames with Software RegiStax V.5.  Atmospheric  transparent :8/10, Seeing : 8/10. Equipmentborrowed from Mr.Ng. Taken at Kennedy Town 堅尼地城, Hong Kong.