NGC 4559 (UGC 7766) Galaxy in Coma Berenices

Located at: RA 12 hours 35 minutes 58 seconds, Dec +27 degrees 57 minutes 36 seconds

Size: 10.8' x 4.3' Magnitude: 10.5 blue Class: SAB(rs)cd HII

North is up

West to the right


 14.5" f5 Newtonian reflector


 ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56


Lumicon Red filter, 550 minutes (55 x 10 minute subs), 06/10/13/19/20/2013; seeing 2.8-3.9 FWHM per CCDStack


CCDStack 2.69.4870.18821, Photoshop CS5.1


 Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)


From the NGC / IC Project:

Contemporary Visual Observation(s) for 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
Historical Research Notes / Correction for NGC 4559
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.