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Type: galaxy, Sc
Mag: B=15.6, V=?
Size: 1′ x 0.691′
NGC 6617. Swift not only describes this as the largest, faintest, and most difficult of the eight objects he found in the area, he also says that it is "in [a] vacancy." While there are faint stars nearby, the ones he would have noticed are far enough away that the object does indeed appear to be pretty isolated. See NGC 6607 for more on this field.
The RNGC (Sulentic and Tifft 1973) notes that this is a 15.5 mag galaxy. Their coded description reads VDIF,R,LBM,FSTELNUC).
The Messier objects
The Bennett objects
The Caldwell list
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