Object name: HCG075
HCG 75 is a tight group of 8 galaxies in northwestern Serpens Caput about 550 to 590 million light years distant. One has no distance estimate. Are they really at the same distance or is this just an illusion due to our perspective? I found no non-redshift distance estimates to help here. It is rather likely they are at about the same distance and the difference in redshift values is due to their relative motion around a common center of gravity. Assuming they are about the same distance the group is a bit over 400,000 light-years across. Close enough that I'd expect to see some rather noticeable interaction. While A and B overlap I don't really see any interaction and the others show none other than H is an irregular blue galaxy but this may just be its nature. With no distance estimate of any type, G may be a distant background galaxy of which many are in the image.