The appearance of Pegasus reminds me that there are a couple of well-known compact galaxy clusters in that constellation. One of them, Stephan’s Quintet is included in a catalogue of galaxy clusters – the Hickson catalogue
It is a pretty challenging set of targets for all you astrophotographers out there! There is a sub-set of the easier ones (!) at
I have only managed to image 3 out of this list, so far, and here are some PD images from my archive to wet your appetite.
Hickson 44, comprising NGC3187, NGC3193, NGC3190 and NGC3185
Hickson 68, comprising NGC5350, NGC5354, NGC5353, NGC5355 and NGC5358
Hickson 92 (including Stephans Quintet), comprising NGC7320C, NGC7320, NGC7319, NGC7318B, NGC7318A and NGC7317
The other well-known cluster in Pegasus is the Deer-Lick group, comprising NGC7336, NGC7335, NGC7331, NGC7340 and NGC7337