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Type: galaxies (interacting)
Mag: B=14.6, V=?
Size: 0.741′ x 0.741′
NGC 6039 = NGC 6042. The description in Swift's list 4 reads "sp of 3," though it should be "sf of 3." Swift's positions in the Hercules Cluster area are not very good, and a few of his objects -- including this one -- are not identified with certainty. In defense of his positions, Swift claims that they agree well enough with Stephan's for the objects in common. This is true. It is also true that Swift's other positions for Hercules Cluster objects are much further off the mark. Did he perhaps fudge the numbers a bit for the three objects common to both lists? The others are NGC 6040 and NGC 6041, both pairs of galaxies. Also see NGC 5736 for another of Swift's nebulae which have different positions in different of his lists.
Listed as No. 122 in Arp's "Atlas of Peculiar Galaxies" (Astrophysical Journal Supplement, vol. 14, 1966.) He remarks "Hercules cluster."
The RNGC (Sulentic and Tifft 1973) notes that this is a 14.5 mag galaxy. Their coded description reads S,EL,SBM,IN CL INTERACTING W/40.
Corwin (1971, Pub. Astron. Soc. Pacific, Vol 83) notes that this object is a star, at 1950.0 coordinates R.A. 16h 02m 13.3s, Dec. +17° 53' 18''
The Messier objects
The Bennett objects
The Caldwell list
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