That's the tidal arm from the interaction. There's distortion in the lower galaxy (UGC 594) as well as lots of star formation judging by the color and rather intense blue white of the arms. NGC 317's arms are really weird. Then there's that funny blue vertical oval that seems to overlay UGC 593 and a really blue blob above and left of the core of 593. Which galaxy these last two belong to I don't know. Pure redshift data would say 593 is in front of NGC 317 but it looks to me to be behind with the radial velocity difference due to motions within the group. I found little on these guys on the net. Most I did find consider NGC 317 and UGC 593 as in contact. I don't really see it in my photo however. But they are weird. That "distant" blue knot above 593 I assume is part of the interaction and not some distant faint fuzzy. But I found nothing either way on it.

I need to do this next fall under better seeing conditions and when I can get more color data. The color is just too noisy. I need to get the weather man on my side. He's really been a pain since September. I've been clouded out every new moon for 5 months now. I've had to work with a lot of moonlight the few semi-clear nights I've had which doesn't help. Worst period of weather I can recall. Little moisture, just clouds. We need the moisture but clouds with no snow or rain are a pain.

Rick