Harold Corwin

The identity is not quite certain. I first measured the position of a star cloud that I thought was IC 139, but this turned out to be half an arcminute north of Bigourdan's micrometric position. Checking the field, however, I found that his position is very clearly on a foreground star (or possibly a compact HII region?) of about 14th magnitude embedded in a confused area of fainter stars. His description is telling, too, as he refers to a nebula about 30 arcsec across with a brighter central point that he measured. It seems likely that the combination of the star and the background light of M 33 led him to think he had found a nebula.

The position I've adopted, after some consultation with Steve Gottlieb and Tony Flanders, is that of the 14th magnitude star. I've measured two or three other star clouds in the area as well and their positions are in the table, too.

Also see IC 135 for a note on the identity and position of Bigourdan's comparison star.

― IC Notes by Harold Corwin

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