Object name: ARP258
Designation(s): ARP258, HCG18,
Exactly what constitutes Arp 258 is a bit difficult to determine. Some sources are quite inconsistent from page to page in this regard. Some say it is just the chain of debris plus one galaxy at the bottom all collectively known as Hickson 18 or UGC 2140. Others leave off the bottom galaxy as it is a distant interloper. One that leaves off the bottom one on one page includes it on another and adds the two anonymous galaxies to the west. So take your pick.