Harold Corwin

IC 3550, IC 3551, IC 3552, IC 3555, and IC 3563 are HII regions in the arms of NGC 4559, found on a Heidelberg plate by Max Wolf. IC 3554 and IC 3564 are stars superposed on the galaxy. See the IC numbers for a bit more information.

― IC Notes by Harold Corwin

Harold Corwin

IC 3563 and 3564 are objects (HII regions and a star cloud) in NGC 4559, easily seen on the print of Wolf's original plate, though completely blended on the print. There is also a foreground star just south that is included in Wolf's image.

Wolf's original plate must be clearer in this area as he was able to make two objects out of the single blob on the contact print. Following his lead, I've -- more or less arbitrarily -- made the western object (the brighter HII regions) IC 3563, and the eastern (the star cloud and the foreground star) IC 3564. This may not be correct, but does not do terrible mischief here.

In the early 1970's, I took the star alone as IC 3564, but that was long before I had seen the print of Wolf's plate.

― 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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