I finally got a clear night, so I went to a high altitude site for some DSO observing starting at midnight. Temps ran in the mid 20's, excellent transparency, frost, poor seeing, and strong breeze. Late on the agenda was IC 1101 and a search for some members of the extensive cluster of galaxies surrounding this behemoth. I had made some finder charts a few weeks ago down to 18 B mag, but didn't expect to see anything past 17 B...which in theory meant only a handful of targets were likely to be visible, and most of them far from the center of the cluster. But the universe had some surprises waiting...
IC 1101 was found easily in the 20" at 156x. Despite being 1 billion light years away, this thing is enormous considering the distance! It is the apparent size of some close Local Group galaxies. It trails off rapidly in visual magnitude, so the best views were at mid power where the surface brightness was more apparent. At high power the extent was less visible. This one should not be too difficult to detect with any large aperture scope. Unfortunately I did not get a good estimate of the size because of this "now you see me, now you don't" aspect.
The seeing limited me to 278x effective. Past that the stellar images broke down badly making it difficult to resolve galaxies vs. stars. My table of 54 B mags appears to be more conservative than anticipated. Looking at the B and g magnitude, the visual level is typically~1 mag brighter for galaxies like these.
The breeze and poor seeing limited views nearest the core, as well as some of the faintest targets. Nevertheless in a fairly small inner section of the cluster I detected 13 galaxies all the way to 18.15 B. Ironically, I didn't even target the brighter targets further out that I expected to resolve. I could have, but I was becoming more and more chilled by the wind so I called it a night. I want to revisit in decent seeing to see if I can resolve more near the core at 350 to 500x. There is far more of this cluster visible than I suspected.