Also sounds like you might be dropping frames or capturing at largest frame size and just cant get above 5fps. Try using ROI (region of interest) or a smaller capture size instead of wasting data bandwith on emptyness you're going to crop out anyway later. eg if you are capturing at 1280x1024, change that to 640x480 and you should see a dramatic increase in FPS possible and the planet is still the same size in pixels. Also be aware each planet reflects light differently too so exposure will vary between them. Under expose if you can to capture more quality frames, you can readjust exposure later after stacking hundreds of frames.
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