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While not completely disagreeing with Trevor, I felt an exposure of the duration you have tried should have shown it.
Try a couple of things though.
Try an Ha filter, it shows beautifully with one.
Try also to "align" and synch on a bright nearby star, Alnitak would be perfect, then slew/goto to the Horsehead (can't recall it's proper designation, IC 433???).
Keep at it.
Gary
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