Simple level and curves will do most of what you initially want. For instance you shot was a bit tricky - signal to noise was poor - so it took 2 minutes (5 iterations of levels then curves - each round less aggressive adjustments) to do this with your first shot:
BTW - Jupiter's moons look like your focus is out. I think Jupiter is often a combo of 1/30 of a second shot - say best 50 of 200 - stacked and aligned. You can then do a 2-3 minute shot - subtract out Jupiter leaving just its moons and add this to your earlier shot after you remove teh moons from it if need be.
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