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Martin,
I have never before seen the optically luminous streamer or tidal tail coming from NGC 7320 (in Stephan's Quintet) as clearly as it shows in your image.
What does this feature look like at maximum contrast and brightness?
As I briefly discussed in my contribution to the recent Leonardo70 thread about NGC 7331, there is little reason, in my view, to believe that this galaxy is physically associated with the other members of the Quintet.
(I believe that this is the current scientific consensus on this issue.)
NGC 7320 is at a closely similar redshift to NGC 7331.
Furthermore, your excellent image clearly shows that the tail coming from NGC 7320 is quite distinct from the other tidal material that is seen in the Quintet.
I have just contacted Travis Rector, who recently studied the Quintet with the Gemini Telescope, to ask him what he thinks of the features on your image.
cheers, bad galaxy man
[ I also mention (in case you haven't seen this reference) Arp's picture processing analysis of photographic plates of this field, in the abovementioned post ]
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