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Mag: B=?, V=?
NGC 5586 may be = NGC 5587, but Swift's description ("eF, vS, R; nearly bet 2 B sts") doesn't match -- the galaxy is very elongated and there is only one bright star near to the southeast -- and his nominal declination is 44 arcmin off. Another possibility is CGCG 075-022, but that is too faint, and has no flanking bright stars. The other two candidate galaxies in the area, NGC 5583 and NGC 5591, were both found the same night as N5586, so are not likely to be the missing galaxy. There is no significant systematic offset in their positions, either.
I searched at reasonable digit errors (+- 1 deg and +- 1 minute) with no luck, so the best we can do with this object for the time being is "Not found."
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads NF S.
The Messier objects
The Bennett objects
The Caldwell list
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