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Jupiter, Io and Callisto before the fog!


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I was all prepared to have another go with my ASI 120 MM and capture the Callisto shadow transit.  Unfortunately that went pear shaped as within seconds of 9pm the North Sea fog reached Ripon.  Anyway here is my capture from about 8:20pm GMT which shows Io to the left and Callisto in transit over the polar region before the appearance of the shadow.  Callisto looks pale in comparison to Io.  SCT 9.25" at f/20 best 15% of 4000 frames stacked in AS!2.  I am gradually learning how to use the hardware and software but any tips gratefully received.


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