NGC 772 (Arp78) is an interesting galaxy. It is about 130MLy distant and has a satellite galaxy NGC 770 that is probably responsible for its elongated spiral arm.
Details
2021-10-08 at the Dominion Astrophysical Obseratory Plaskett telescope.
Data collected by Dan Posey and processed by WJM.
Sloan R,G,I filters used for color and G for luminance.