Harold Corwin

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 Astronomical Journal, 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 (I assume he had one) 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.

― IC Notes by Harold Corwin

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