Harold Corwin

IC 2232 = NGC 2543 (which see). Glen Deen suggested that IC 2232 might be the faint galaxy 3 arcmin south, but this consistent with neither Javelle's position (which is good), nor his description (which agrees with the Herschel's descriptions for NGC 2543).

― IC Notes by Harold Corwin

Harold Corwin

NGC 2543 = IC 2232. The galaxy was first seen by William Herschel in Feb 1787, and was re-observed in Mar 1790. The two positions that he measured are not in particularly good agreement (08 09.6 +36 20 and 08 09.8 +36 35). John Herschel picked it up once in Feb 1832. His position is 08 11 45, +36 24.6, also not in good agreement with either of his father's determinations. However, Sir John notes a "a coarse ** p points to it." This note is correct, and the "double star" is quite wide.

The GC and NGC adopted sort of a mean of these three (08 10 43 +36 24.7) which was corrected by Dreyer in the IC 1 notes, following Spitaler (08 09 38 +36 24.7). Actually, Spitaler's micrometric position (measured in Dec 1891) reduces to 08 09 42.9 +36 24 07, using the GSC position for his comparison star, and ignoring its (unknown) proper motion.

Javelle scanned the field in Feb 1896 and his position (for IC 2232) reduces to (again ignoring proper motion) 08 09 42.5 +36 24 12, agreeing well with Spitaler. Thus, there is no question that the two different numbers apply to the same object.

This identity was first suggested as being the same as NGC 2543 by Reinmuth in 1926, and every catalogue since has made the equality. The descriptions of the galaxy and the surrounding star field simply nail the lid, leaving no doubt about the equivalence of the two entries.

― NGC Notes by Harold Corwin

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

A complete list of credits and sources can be found on the about page