Object name: ARP180
Arp 180 is a pair of interacting galaxies. The second is the small blue dot near the core of the main galaxy and right on the arm. In fact, much of that arm may be a plume from this second galaxy thus explaining why this arm is so much brighter and bigger than the northern arm which barely registers in Arp's photo. I find no catalog that names them separately. They are known by several other names MCG -01-13-034 and VV 822 seem the most commonly used. This is the first Arp galaxy I can find virtually nothing on. No distance data at all. Arp's comment is: "S arm kinks back, thin filament connects nuclei." What little I found on it also only mentioned the south arm. I don't know why the north one gets so little respect but it is very faint, nearly in the noise level of my image. The filament that Arp says connects the two looks little different from the short bright arm seen in Arp's image on the other side of the larger galaxy. So the "connection" may be due to perspective and not a real connection.