Lewis Swift discovered NGC 6607 = Sw. I-91, along with nearby NGC 6608 and 6609, on 4 Aug 1883, and recorded "eF; pS; R; v difficult." His position is 17 seconds of time due west of CGCG 301-020 = PGC 61550. As NGC 6609 = CGCG 301-021 = PGC 61559 was placed 20 seconds east (the actual separation is 19 seconds), the identification is certain. Herbert Howe was unsuccessful in finding NGC 6607 on 3 nights with the 20" refractor at Denver in 1899-00, though on one night he "suspected" one or two objects in the vicinity. CGCG mislabels CGCG 301-020 as NGC 6608.

400/500mm - 17.5" (7/21/98): this very difficult object required averted to glimpse a 15" spot just 2.2' W of brighter NGC 6608.

17.5" (6/11/88): extremely faint and small, round. Forms a pair with slightly brighter NGC 6608 2.2' E. This galaxy is misidentified as NGC 6608 in the CGCG.

600/800mm - 24" (7/19/12): faint, small, round, 24", low even surface brightness. In a trio with brighter NGC 6608 2.3' E and extremely difficult NGC 6609 (identification uncertain) 2.7' SE. Fifth of 7 or 8 faint NGC galaxies discovered by Swift in a 30' group.

Notes by Steve Gottlieb