Halton Arp's "Atlas of Peculiar Galaxies" was meant to provide examples of various types of galaxies as a guide for study of the origin and evolution of galaxies, at a time (the mid-1960's) when astronomers had little idea what that involved. Although the Atlas was intended only as a sampling, rather than an inclusive listing of galaxies, it contains a number of interesting objects that are often referred to by their Arp numbers.

ARP PECULIAR GALAXY 87 ALSO KNOWN AS NGC 3808

Bob was presented his Certificate for completing the Arp Peculiar Galaxy list in July of 2013