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I agree with TerryB, try and find something like a ST9. If your interested in astrometry this would be a good start.
You can easily run your reducer at f5 and maximise your field of view for asteroid searching. I'm not sure how sucessful you would be as you need to aim for mag 19 and to do this with a 10" scope problably requires at least 1 minute exposures. When you take into account that you need to then take 3 images of the same part of sky in one night to reduce false alarms you are not going to be able search much sky (30 square degrees per night). But you never know!
Terry
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