Max Wolf discovered IC 3564 = W. IV-230 on a Heidelberg plate taken 23 Mar 1903.

900/1200mm - 48" (4/7/13): IC 3564 is a stellar association attached to IC 3563 near the southeast end of NGC 4559. At 375x, both objects were easily visible, but not resolved, as a fairly faint 20" patch, 3' from center.

Notes by Steve Gottlieb