M 108 (NGC 3556) Galaxy in Ursa Major

Located at: RA 11 hours 11 minutes 30 seconds, Dec +55 degrees 40 minutes 19 seconds

Size: 8.7' x 2.2' Magnitude: 10.7 blue Class: SB(s)cd sp HII

North is up

West to the right

Telescope:

 8" f5 Newtonian reflector

Camera:

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

Image:

Lumicon Deep Sky filter, 470 minutes (47 x 10 minute subs), 03/9/10/14/2008; FWHM 2.5-4.1 per CCDStack

Processing:

CCDStack 1.3.2, Photoshop 7.0

Location:

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

Notes:

This image replaces a red-filtered 75 minute Track & Accumulated image from 04/19/2006. See the red-filtered sequence image. See the 14.5" version.

From the the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 3556

NGC 3556 = M108 = U06225 = MCG +09-18-098 = CGCG 267-048 = CGCG 268-001 = PGC 
34030
11 11 31.8 +55 40 14
V = 10.0;  Size 8.7x2.2;  SB = 13.1;  PA = 80d

17.5": very bright, very large, edge-on 4:1 WSW-ENE, 8.0'x2.0'.  A mag 12 star 
is superimposed just westW of center (V = 12.5) appearing similar to a bright 
stellar nucleus.  Two fainter stars are also superimposed E of the core.  A 
bright knot is visible west of the core (1.3' W of the star) and the region near 
the core appears dusty.  A mag 12 star is just S of the W end 4.9' from the 
center.

13": fairly bright, very elongated, stellar nucleus.

- by Steve Gottlieb