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There is a formula for calculating the distance between the artificial star and telescope (suiter's book would have it in). It depends on the size of the artificial star and resolution of the telescope among other things. I do remember making such a calculation for my 9.25" some years ago and it was about 43 metres. For a c11 it would be more , as a rule of thumb about 20 x the focal length. It has to be this sort of distance to give a star size better than the resolution of your telescope otherwise your looking at a round hole not a starlike point.
Philip
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