Spiral Galaxy M108 (NGC 3556), type Sc, in Ursa Major

RA 11 : 11.5 (h:m); DEC +55 : 40 (deg:m); Distance 45 million light years;
Visual Brightness 10.0 (mag); Apparent Dimension 8x1 (arc min)

The nearly edge-on galaxy M108 appears to have no bulge and no pronounced core at all, it is just a detail-rich mottled disk with heavy obscuration along the major axis, with few H II regions and young star clusters exposed against the chaotic background -- in a word: "Very Dusty".

Source and more: SEDS


March 2, 2009 21:37 - 23:10 UT.
Imaging: William Optics Zenithstar 80 ED II APO, f/6.8 [focal length 545 mm] with ATK16IC camera, Astronomik LRGB filters.
Exposures: Lum 12x300s [1x1]; RGB 5x120s [2x2]; all unguided.

January 31, 2009 23:07 - 23:53 UT.
Imaging: William Optics Zenithstar 80 ED II APO, f/6.8 [focal length 545 mm] with ATK16IC camera, Astronomik L filter.
Exposures: Lum 9x300s [1x1]; all unguided.

March 12, 2007 21:40 - 22:10 UT.
I like this somewhat wider field.
Imaging: William Optics Zenithstar 80 ED II APO, f/6.8 [focal length 545 mm], Astronomik L-Infra Red Blocking Filter; SC3a b/w RAW camera.
30 unguided exposures of 60 seconds.

March 9, 2007 21:44 - 21:56 UT.
Imaged with LX200 10-inch f/10 telescope with 0.33 Focal Reducer operating at f/4.06 [focal length 1015mm], Vesta Pro-SC3a b/w RAW mode, Baader Infra Red Blocking Filter.
19 unguided exposures of 14 seconds.

February 4, 2007 00:15 - 00:32 UT.
Imaged with LX200 10-inch f/10 telescope with 0.33 Focal Reducer operating at f/4.06 [focal length 1015mm], Vesta Pro-SC3a b/w RAW mode, Baader Infra Red Blocking Filter.
45 unguided exposures of 20 seconds.