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NGC 6040 is a pair of galaxies, NGC 6040A and NGC 6040B.
NGC 6040. See NGC 5736, as well as NGC 6039 = NGC 6042 where I suggest that Swift might have fudged his position for this to make it agree better with Stephan's micrometrically-measured place.
Lacaille's catalogue
The Messier objects
Dunlop's catalogue
The Bennett objects
The Caldwell list
Named DSOs
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