Harold Corwin

IC 131 is a group of HII regions immersed in two small star clouds in M 33. It is often misidentified as the much brighter compact HII region about half an arcminute preceding the northern star cloud. This cannot be the IC object as Bigourdan's measurements clearly point at the star clouds, his description fits them, and he specifically mentions the compact HII region calling it a 13.5 magnitude star.

Bigourdan found this the night of 28 October 1889 when he went over the face of M 33 carefully. He also found IC 132 through IC 137, IC 139 and 140, and IC 142 and 143 (some of these have notes here); and he measured the known NGC objects as well as M 33 itself. Quite a productive night!

― IC Notes by Harold Corwin

Drawings, descriptions, and CCD photos are copyright Andrew Cooper unless otherwise noted, no usage without permission.

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