Guillaume Bigourdan discovered IC 135 = B. 126, along with numerous other HII regions and star clouds in M33, on 28 Oct 1889. Harold Corwin notes that Bigourdan made an error with the "estimated offset from M33's nucleus of his comparison star". It also appears that his offsets were applied with the wrong signs as the relative positions of these objects are reversed in RA as well as declination! As a result, the IC positions for IC 135, 136, 139, and 140 are incorrect and out of RA order. But if the relative differences in RA and NPD are reversed and applied to IC 135 at the position given here, then they land on the correct positions for IC 136, 139 and 140.

400/500mm - 17.5" (10/25/97): fairly faint, fairly small, 1' diameter. This HII region is located 6' ESE of the center of M33 and is symmetrically placed on the opposite side of M33 from NGC 595. IC 136 lies 3.5' S.

Notes by Steve Gottlieb