Guillaume Bigourdan discovered IC 131 = B. 122, along with numerous other HII regions and star clouds in M33, on 28 Oct 1889.

400/500mm - 17.5" (10/25/97): very faint, very small, round, 10" diameter. This HII region is located 10' WNW of the center of M33 near a wide pair [50"] of mag 11/12 stars. A mag 14 star is nearby and at first I thought this star was IC 131 (on the DSS this 14th magnitude "star" is a compact HII region and was also described as a star by Bigourdan). Collinear with IC 133 8' N and IC 132 11.5' N.

Notes by Steve Gottlieb