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Revisited HN40 tonight. Seeing was about 6/10 with reasonable transparency. Using an 8" F6 Dob (Stringscope) and a 32mm Plossl @ 38X, A & C were easily split. I also noticed B was consistently visible at this magnification, very close to A and on an extended straight line C-A. I then increased the magnification to 142X (24mm UO Konig & Klee Barlow). At this magnification I could just see D very close to C and at right angles to the B-A-C line. When I pushed the magnification to 212X (UO 16mm Konig & Klee Barlow) D was clearly split but the seeing caused intermittent image degradation.
Cheers,
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