Harold Corwin

IC 917 may be a star, but its companions (IC 918, IC 919, IC 921, IC 922, IC 923, IC 925, IC 926, IC 928, IC 929, IC 930, IC 931, IC 932, IC 934, IC 935, IC 936, IC 937, and IC 938) are galaxies in Abell 1783. See IC 917 for the full story on this cluster.

Hubble, by the way, in his PhD thesis at the University of Chicago (Publ. Yerkes Obs. IV, Part II, 1917) describes this area and lists positions of some of the galaxies in the field. He listed tentative identifications for only three of the galaxies: IC 921, IC 925, and IC 938. The identifications that I've adopted agree with Hubble's for IC 921 and IC 938, but not for IC 925: Hubble has this as the galaxy at 13 43 14.1, +55 36 11 = my IC 923, while I have the galaxy at 13 43 16.1, +55 36 36 as IC 925.

― 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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