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IC 2571
IC 2571
History and Accurate Positions for the NGC/IC Objects (Corwin 2004)
IC 2571 = NGC 3223. Both NGC and IC carry positions that are unmistakeably close to the galaxy, with the IC position (from a micrometric measurement by Herbert Howe) being essentially spot on. Dreyer simply missed the identity.
Here is how I think he did it. Swift published the object as new in his 11th list in AN, though it appeared a few months earlier in his 6th list (from Lowe Observatory) in Popular Astronomy and Monthly Notices. His position is far enough off NGC 3223 that Dreyer apparently agreed that it was a "nova", and put it into his working list for IC2 as such. Then, Howe's observation was published in MN, and Dreyer corrected his working list without checking the NGC again. So, the galaxy has an IC number as well as one in the NGC.
Historical observations
Swift, Lewis (1898)
Announced in "Astronomische Nachrichten" No. 3517, "Catalogue No.11 of Nebulae discovered by Lewis Swift".
IC 2571 is listed as no. 107 in this publication, discovered on 1897 December 30, as "vF; CS; R; 9m * p close f".
Dreyer's IC also notes that Howe recorded IC 2571.
Published comments
Paturel et al. (1991)
Paturel, G., Petit, C., Kogoshvili, N. et al. (1991) An extragalactic data base. IV. Errors and misprints in catalogues of galaxies. Astrophys.J.Suppl.Ser., 91(3), 371.
NGC 3223 = IC 2571
Helwan Obs. Bulletin No 15 (1915)
Clearly = NGC 3223 from Howe;s note (MN LXI, p 49) His star mag 10.5 is not shown however.
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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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