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NGC 5697
NGC 5697, IC 4471, LEDA 52207, MCG+07-30-031, UGC 9407, II 675, h 1853, GC 3952
Type: galaxy (quasar?), S?
Mag: B=14.6, V=?
Size: 0.954′ x 0.562′
PA: ?
History and Accurate Positions for the NGC/IC Objects (Corwin 2004)
NGC 5697 = IC 4471, which see. There are two numbers on this galaxy because the Herschel's positions differ by 43 seconds of time (WH is closer, but keep reading), and their declinations are five arcmin off the real declinations. So, Bigourdan was understandably confused by the field. IC 4471 has that part of the story.
However, an NGC note reflects another confusion between NGC 5696 and N5697 that arises when comparing the Herschels' positions. WH's relative positions place the galaxies southwest-northeast (this is correct), while JH's put them northwest-southeast. JH's RA's are at fault, and he marks both of them with plus-minus signs. His declination for N5697 is also so marked, while that for N5696 is flagged with a colon. He also notes that the "RA [for N5696] is by working list", but there is some error in the reduction (CH's?) for that list as that RA is 20 seconds smaller than WH's, and 28 seconds smaller than the GC's and NGC's. Where did this RA come from? Whatever the answer, WH's reduced positions (from his discovery observations) are closer in both cases, but are still five arcmin off in declination.
In the Scientific Papers, Dreyer notes that WH saw both objects in Sweep 725 on 9 April 1787. Here, WH has N5696 (II 648) 36 seconds preceding, 10 arcmin south of N5697 (II 675). This is reasonably close to the real offsets (in 1787) of 26.3 seconds and 8 arcmin 27 arcsec.
JH made the best of the situation he could, and Dreyer faithfully copied it into the NGC. Fortunately, the positions are not too far off the real values, and there are no other galaxies nearby to further confuse the issue. So, the identities in the NGC can be adopted pretty much as they are. The 1860 NGC positions should read 14 31 32, 47 33.7 for N5696, and 14 31 06, 47 42.3 for N5697.
Historical observations
William Herschel (c.1784)
Synonyms: H II-675
Discovered in 1787 by William Herschel with an 18.7-inch f/13 speculum telescope. He called it "F, vS."
Published comments
Sulentic & Tifft (1973)
The RNGC (Sulentic and Tifft 1973) notes that this is a 14.5 mag galaxy. Their coded description reads SLEL,UHISB.
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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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