M 99 (NGC 4254) Galaxy in Coma Berenices

Located at: RA 12 hours 18 minutes 50 seconds, Dec +14 degrees 25 minutes 02 seconds

Size: 5.4' x 4.7' Magnitude: 10.4 blue Class: SA(s)c HII

North is up

West to the right


 8" f5 Newtonian reflector


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


Lumicon Red filter, 480 minutes (48 x 10 minute subs), 05/20/21/22/2009; seeing 1.4-2.6 FWHM per CCDStack


CCDStack, Photoshop 7.0


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

Notes: See the 14.5" version.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 4254

NGC 4254 = M99 = U07345 = MCG +03-31-099 = CGCG 098-144 = LGG 285-011 = 
CGCG 099-011  = Pinwheel Galaxy = PGC 39578
12 18 49.6 +14 24 59
V = 9.9;  Size 5.4x4.7;  SB = 13.2

18" (4/10/04): a fairly prominent arm is attached at the SE end of the large, 
bright core and winds along the south side towards the west.  This arm is 
clearly detached from the core with a dark gap between the arm and the core.  
The northern arm is ill-defined and appears more like a couple of short "brush-
strokes" close N of the core.

17.5": very bright, large, bright core, stellar nucleus.  There is an obvious 
spiral arm attached at the SE side of the core and winding along the south side 
towards the west.  There is a dark gap between the spiral arm and the core along 
the south and west side.  A second shorter, diffuse arm is visible on the north 

13": bright nuclear region.  A spiral arm is easily visible attached at the SE 
side of core and winding almost 180? to the west.

- by Steve Gottlieb