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Mag: B=?, V=?
NGC 5509 = CGCG 133-010. Bigourdan's declination, as published in his first list of new nebulae in Comptes Rendus, is 16.3 arcmin off the position derived from his micrometric offsets. This may be a simple mistake, or it could be the result of confusion over his comparison star. He lists it twice (once for each of the nights he observed N5509), but at different magnitudes (8.5 and 11.5) and declination offsets from BD +21 2625 (-19 arcmin and -17.2 arcmin). GSC has m = 11.6 from two measurements with the offset being -18 arcmin.
Whatever the cause of the error, the correct identity is clear when the reductions are redone using the modern position for the comparison star.
The RNGC (Sulentic and Tifft 1973) notes that this is a galaxy. Their coded description reads STEL.
The Messier objects
The Bennett objects
The Caldwell list
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