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Type: stars (three)
Mag: B=?, V=?
NGC 5877 is a double star with a third star close to the north. The two southern stars are a bit fainter than the northern one, and are a bit closer together than they are to the northern. These facts apparently made all the difference in Schmidt's observation -- he saw them as a faint, small nebula with a 12th magnitude star attached to the north.
Interestingly, his observation is not in any of the published papers of his that I have (including the two referenced in the NGC), nor does Dreyer give the reference in his GC Supplement. This is one case where I have not seen the original publication. Fortunately, Schmidt's position is very good and points right at the asterism.
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads *** DC.
The Messier objects
The Bennett objects
The Caldwell list
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