Guillaume Bigourdan discovered IC 137 = B. 128, along with numerous other HII regions and star clouds in M33, on 28 Oct 1889. His micrometric position falls within M33-A12; IC 137 is the southwestern part of the association.

400/500mm - 17.5" (7/5/86): very faint HII knot or star association in M33 located along the main southern spiral arm 10' SSW of center of M33.

Notes by Steve Gottlieb