M108 NGC 3556

Object Type Galaxy SBc
Constellation Ursa Major
Magnitude 9.9
Size 8.5' x 2.5'


Combination of 5, 3 minute images unfiltered.
SBIG STL-1001E CCD. 20" f/6.8 Dall-Kirkham cassegrain telescope at prime focus.

There are a few Messier galaxies in the Herschel 400 list. NGC 3556, number 166 is one of them, being also listed as M108. It is a large and bright spiral galaxy in Ursa Major. There are a number of faint galaxies in the above image, the brightest of which is the 16.1 magnitude, PGC 34128, located near the left-hand edge.

Visual Observation Notes:- NGC 3556.

M 108. Very very large and bright. Some mottling visible, quite elongated. Bright star on western edge.
18" f/5 newtonian. 16mm nagler eyepiece. 143x.
Sky View observatory. Zenith limiting magnitude 6.7.


Combination of 10, 3 minute images unfiltered.
SBIG STL-1001E CCD. 20" f/6.8 cassegrain at prime focus.