NGC 4656 and NGC 4657 are a pair of interacting galaxies located in the constellation Canes Venatici. The pair is sometimes informally called the Hockey Stick Galaxies. Both galaxies are members of the NGC 4631 Group.
This is not an Arp, but is uquite irregular so I thought it belonged here.

It was taken using the C6 and the MX916. 30 x 60 second images stacked in Astroart and processed in photoshop.