NGC 4631 (also known as the Whale Galaxy or Caldwell 32) is a barred spiral galaxy in the constellation Canes Venatici about 30 million light years away from Earth. It was discovered on 20 March 1787 by German-British astronomer William Herschel. This galaxy’s slightly distorted wedge shape gives it the appearance of a herring or a whale, hence its nickname. Because this nearby galaxy is seen edge-on from Earth, professional astronomers observe this galaxy to better understand the gas and stars located outside the plane of the galaxy.

The smaller galaxy is GC 4627 is a dwarf elliptical galaxy in the constellation Canes Venatici. The galaxy lies about 30 million light years away from Earth. NGC 4627 is located 3 arcminutes northwest of the nucleus of NGC 4631, a spiral galaxy which interacts with it.