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If you set your screen to 300% you will see a dark gap between the fainter "double" stars, indicating that you don't have one continuous exposure. The two sets of diffraction spikes on the bright stars are
cleanly defined, again indicating two separate exposures. It is possible that the mount did a quick little slip midway through the exposure, not
allowing enough time for light to register on the image during the slip, and causing the little black gaps, but I think the spikes are too sharp for that; I think the spikes on the bright stars would show the rapid movement of a slip with at least some blurring.
If a slip is discounted, the fault would seem to lie with the camera or intervalometer [if you were using one].
raymo
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