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Type: galaxy, E
Mag: B=13, V=?
Size: 1.412′ x 1.412′
NGC 6125 = NGC 6127 = NGC 6128. There are only two galaxies in this area (the other is NGC 6130), but four NGC numbers. NGC 6125 = H II 810 is the brighter of the two, so is almost certainly the galaxy that WH saw, though he must have made an error of 20 arcmin in reading the NPD (see Dreyer's note in the Herschel Papers, 1912). Herschel's original NPD is coincidentally identical to that of NGC 6130; this has led Reinmuth to suggest that NGC 6125 = NGC 6130. But the RA's are 51 seconds different, and Dreyer does not mention any problem with the RA's in Herschel's sweep. Dreyer's conclusion that the minutes of NPD recorded by Herschel (59) should be 39 is the most reasonable explanation.
Swift has two objects near the correct place for the brighter galaxy, both from his 4th list, but found about a week apart on 28 June and 6 July in 1886. The descriptions of these two are similar ("pF, vS, R" and "pF, pS, R, BM"), and also agree with Herschel's description ("pF, pS, lE"). Therefore, I am almost certain that the three observations all refer to the same galaxy.
A third object found by Swift, also on 28 June 1886, is preceded by a bright star (SAO 29889) that he noted in his description; this verifies the identification as NGC 6130. The star is not mentioned by Herschel, further evidence that he saw the brighter northern galaxy and not this one.
Synonyms: H II-810
Discovered in 1789 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "pF, pS, lE." The Notes to the 1820 'Catalogue of 500 Additional New Nebulae and Clusters of Stars' read "Not found four times by Bigourdan. In the sweep (928) it comes between III.812 and II.811, both of which are nearly correct. It is no doubt = NGC 6127 (Swift IV.) with an error of 20' in PD..."
The RNGC (Sulentic and Tifft 1973) notes that this is a nonexistent object. Their coded description reads =6130 DC.
The Messier objects
The Bennett objects
The Caldwell list
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