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jupiter is rising at 1.30 i think, but is obviously very low on the horizon and there is too much atmosphere to look thru. the higher it rises, the better.
also 4am, temps should have stabilized ie the ambient should be same for a few hours and thus the mirror has had a chance to catch up to the ambient.
therefore, you have taken tube currents out of the equation and then only worrying about the atmospheric conditions.
Jupiter is so bright, that even as dawn approaches, and all other stars disappear, it still stands out and can be viewed!!
basically it gets better each night!!
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