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NGC 6938
NGC 6938, VIII 17, h 2082, GC 4589
Type: star cluster?
Mag: B=?, V=?
Size: 7′
PA: ?
History and Accurate Positions for the NGC/IC Objects (Corwin 2004)
NGC 6938 is probably the scattered group of stars about a minute of time following WH's single position from 18 July 1784. There is a small core about 5 arcmin by 3 arcmin at the eastern end of a larger elongated grouping 18 arcmin by 8 arcmin -- both of these are clearly seen on the red POSS1, and both are elongated in the same position angle (about 105-110 degrees). On the blue POSS1, the small core is southeast of the center of a poorly-defined, nearly circular grouping of stars about 20 arcmin across.
Even though JH saw the cluster (if that is what it is) twice, he was clearly not impressed. His first observation has no RA and only an approximate Dec. His description reads, "Very poor. The large star taken but carelessly, as it offers no interest." He did better the second time with a well-determined RA, but still only an approximate Dec, 3 arcmin south of his first estimate. He also misidentifies the cluster as "VII. 17" rather than "VIII. 17" as it properly is.
Historical observations
William Herschel (c.1784)
Synonyms: H VIII-017
Discovered in 1785 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "a cluster of many large scattered stars."
Published comments
Sulentic & Tifft (1973)
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads NOCL S.
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Favourite lists
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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