Harold Corwin

IC 135, IC 136, IC 139, and IC 140. These are all HII regions or star clouds in M33. There is an error in Bigourdan's estimated offset from M 33's nucleus of his comparison star for these four. He claims that the 10th magnitude comparison star is 8' south, and 31 seconds of time preceding the nucleus. There is no star that bright in that position. However, there is a star of the right brightness 8 arcmin south and 31 seconds of time FOLLOWING the nucleus. When Bigourdan's measured offsets for his four novae are referred to this star, the four objects can be pretty easily identified (but see IC 139!).

― IC Notes by Harold Corwin

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