Would not Astrometrica be ideal for stacking for asteroids or comets. When the MPCOrb file updated one can select the objects motion. The software is relatively affordable and there is a 100 day free trial. It’s a piece of software that should be in ones tool box in any event. The only reason that springs to mind that may be the reason for non use is the input file extensions (.fit) if DSLR type cameras are being used.
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