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Thanks Leo!
In this case, the stacked image is purely from the one exposure time where Jupiter is not overexposed. The stacking process reduces the signal to noise ratio on the moons sufficiently to be able to just stretch the histogram out on them and not be left with a noisy mess.
The darker ring around Jupiter that you spotted is the border of where I applied the histogram stretch. I can see now that it would be neater to just stretch the moons themselves out and not "everything except Jupiter". Thank you for the feedback.
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