Guillaume Bigourdan discovered IC 133 = B. 124, along with numerous other HII regions and star clouds in M33, on 28 Oct 1889. Harold Corwin notes that Bigourdan's position is "toward the southern end where there appears to be a fairly compact HII region."

400/500mm - 17.5" (10/25/97): faint, diffuse, hazy HII region of 35" diameter at the NW end of M33 15' NW of the center. Forms a "pair" with IC 132 3.4' N. This object is larger than IC 132 at times with averted vision but has a lower surface brightness.

Notes by Steve Gottlieb