Arp 273 is a pair of interacting galaxies, 300 million light years away in the constellation Andromeda.

It was first described in the Atlas of Peculiar Galaxies, compiled by Halton Arp in 1966.

[6] It has a disc that is tidally distorted into a rose-like shape by the gravitational pull of the companion galaxy below it, known as UGC 1813.

The smaller galaxy shows distinct signs of active star formation at its nucleus,[7] and "it is thought that the smaller galaxy has actually passed through the larger one.

"[8] One supernova has been observed in UGC 1810: SN 1962R (type unknown, mag.