Object name: ARP040
Arp 40/IC 4271 is another from Arp's category for spiral galaxies with low surface brightness companions on their arms. It is located in Canes Venatici about 760 to 770 million light-years distant. I suppose the southern member is the "companion" but to me, they are of about equal surface brightness, neither being all that faint. I certainly don't see either as being on an arm of the other. To me, it appears the southern galaxy is in the foreground. It has a dusty disk larger than the optical disk. It is easily seen against the more distant northern galaxy as a dark band "separating" the two galaxies. It is seen in Arp's and Sloan images as well.