Stephan's Quintet is a visual grouping of five galaxies of which four form the first compact galaxy group ever discovered. The group, visible in the constellation Pegasus, was discovered by Édouard Stephan in 1877 at the Marseille Observatory. The group is the most studied of all the compact galaxy groups.

Discovered: September 22, 1877

Number of galaxies: 5

Constellation: Pegasus

Brightest member: NGC 7318B

Discoverer: Édouard Stephan

Right ascension: 22^h 35^m 57.5^s