NGC 7331is a spiral galaxy in Pegasus that is one of the brightest galaxies not to be included in Messier’s catalogue. It’s about 40 million light years away. There are actually four other fainter galaxies visible in the same field. From top to bottom they are NGC 7336, NGC 7335, NGC 7337 and NGC 7340. These four galaxies are not associated with NGC 7331 and are about 350 million light years away.
Here’s my original photo:
The spiral structure of NGC 7331 is clearly visible in this photograph, which was a pleasant surprise as this is a stack of only 20 20-second exposures, and there was a gibbous moon visible while the photos were being taken.
Here’s another image showing where the four fainter galaxies are (they are the fuzzy patches to the left of the main galaxy above):
Photo location: Monifieth (near Dundee), Scotland, UK.
Date: 23 Sep 2015; 21:00 UTC.
Telescope: 11-inch Celestron SCT.
Camera: Pentax K3
Exposure: ISO 800, 20 20-second exposures stacked with DeepSkyStacker.