Max Wolf discovered IC 3556 = W. IV-225 on a Heidelberg plate taken 23 Mar 1903. He reported "F, S, R, bM." Although his position is accurate, the NGC 2000, MCG and PGC misidentify IC 3556 as NGC 4558 and CGCG and UGC "Notes" misidentify IC 3556 as NGC 4563!

400/500mm - 18" (5/12/07): very faint, small, slightly elongated N-S, 20"x15". Located 2' SE of NGC 4558 in the NGC 4556 group. This galaxy is misidentified in CGCG, MCG, UGC, and PGC as NGC 4563 or NGC 4558.

Notes by Steve Gottlieb