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Mag 13 star should be reachable with 8" aperture in good seeing, although my only worry is the 0.3 mag drop. This drop may not be detectable by eye but a video event should make it no worries!
The asteroid is brighter than the star, so keep in mind with your field that you take into account the extra "star". The mag drop will be unnoticeable visually in my opinion!
The star won't blink out at all, it will just dim slightly if you happen to be in the right place at the right time (ie: if the prediction favours you)
good luck!
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