NGC 4559

NGC 4559 = UGC 07766 = MCG +05-30-030 = CGCG 159-024 = PGC 42002
12 35 57.7 +27 57 36
V = 10.0;  Size 10.7x4.4;  SB = 14.0;  PA = 150d

17.5": bright, large, elongated 5:3 NW-SE, ~7'x3'.  Exhibits a striking, unusual 
appearance with a broad, weak concentration to a large, elongated core.  The 
overall surface brightness is noticeably irregular with hints of brighter and 
darker spots.  The outer halo has a low surface brightness, particularly on the 
SE end which is cradled by three mag 12-12.5 stars.  This end is wider than the 
NW side, shows no tapering and there appears to be mottling near the 
superimposed stars.  IC 3550-52, IC 3555, and IC 3563 are HII regions and/or 
star clouds within N4559 discovered by Wolf (made no attempt to identify).

- by Steve Gottlieb

NGC 4559.  IC 3550, 51, 52, 55, and 63 are HII regions in the arms of this
galaxy, found on a Heidelberg plate by Max Wolf.  IC 3554 and 3564 are stars
superposed on the galaxy.  See the IC numbers for a bit more information.
 - Dr. Harold G. Corwin, Jr.

As with all corrections to the NGC and IC Catalogues, there is a certain margin
for error, even though the evidence supporting the correction may be strong and
compelling. It is with this in mind that we ask the user to use this information
as 'Most Probable', but never to assume the correction is 'Absolute'.  All
published corrections are based on an exhaustive 'paper chase' of the historical
record back to the original discoverer's published notes/papers, and are
therefore based upon the historical accuracy (or inaccuracy) of those particular
notes/papers. In short, Caveat Emptor! - Robert E. Erdmann, Jr.