Arp 271 is a pair of similarly sized interacting spiral galaxies, NGC 5426 and NGC 5427. It is not certain whether the galaxies are going to eventually collide or not. They will continue interacting for tens of millions of years, creating new stars as a result of the mutual gravitational attraction between the galaxies, a pull seen in the bridge of stars already connecting the two. Located 90 million light-years away, the pair is about 130,000 light-years across.
The galaxies are each about 3' across, so not large.
https://www.astrobin.com/349612/0/?nc=
Higher res here
https://www.astrobin.com/full/349612/0/
I had some data from this object from about 4 years ago. I added another two hours at the star party. So two different cameras and 4 years separation.
Telescope: 12.5" Planewave CDK
Mount: AP900
Camera 1: QSI@-20---2 hours
Camera2: FLI Proline@-30----2 hours
FOV: about 20' x 20'
Processing: PixInsight
I still need some good luminance data to sharpen things up a bit more.