NGC 7331
The Deer-Lick Group


Combination of 7, 3 minute exposures, SBIG ST-8XE CCD.
300mm f/3.5 Tamron lens.

NGC 7331 is a large and bright spiral galaxy in Pegasus. At magnitude 9.4, it is easily visible in an 8" telescope. Associated with the galaxy are several smaller and fainter companion galaxies. Several of these are visible in a 10" telescope under dark skies. In the image above, just to the left of NGC 7331 is the 13th magnitude NGC 7335. Above it is NGC 7336 and below it is NGC 7337. To the left of NGC 7337 is NGC 7340.

For this image, a synthetic red-filter image was made by subtracting the green and blue images from an unfiltered image.


Combination of 2, 3 minute exposures, SBIG ST-8 CCD.
8" f/6.3 schmidt-cassegrain telescope at prime focus.


Combination of 2, 5 minute exposures, SBIG ST-9E CCD.
8" f/10 schmidt-cassegrain at prime focus.


Combination of 3, 3 minute exposures, SBIG ST-9E CCD.
10" f/6.3 schmidt-cassegrain at prime focus.


Combination of 3, 3 minute exposures, using red, green and blue filters.
SBIG ST-9E CCD. 8" f/10 schmidt-cassegrain at prime focus.


Combination of 20, 3 minute images, unfiltered.
SBIG ST-9E CCD.
14" f/11 schmidt-cassegrain with an f/6.3 focal reducer.


Combination of 3, 3 minute exposures, SBIG ST-9E CCD.
14" f/11 schmidt-cassegrain at prime focus.


Combination of 10, 3 minute exposures, SBIG ST-9E CCD.
16" f/10 schmidt-cassegrain at prime focus.


Combination of 70, 1 minute images, unfiltered.
SBIG STL-1001E CCD. 16" f/10 schmidt-cassegrain telescope at prime focus.


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


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