Perseus

Perseus, the Hero, is a northern constellation named after the Greek hero who slew Medusa. It contains Algol (Beta Persei), the most famous eclipsing binary star, whose regular brightness variations were noted by ancient astronomers. The constellation is the radiant of the Perseid meteor shower, one of the most popular annual meteor showers, peaking in August.

The Perseus family groups constellations connected by the Greek myth of Perseus, the hero who slew Medusa and rescued Andromeda. This family includes some of the most prominent autumn constellations in the northern sky. The constellations tell a connected story: King Cepheus and Queen Cassiopeia of Ethiopia, their daughter Andromeda chained to a rock, the hero Perseus arriving on Pegasus, and Cetus the sea monster — all placed in the sky as a complete mythological tableau.

Mythology & History

The Perseus myth is one of the most complete stories preserved in the constellations. Cassiopeia's boast that she was more beautiful than the sea nymphs angered Poseidon, who sent Cetus to ravage the coast. The oracle declared Andromeda must be sacrificed, but Perseus — fresh from beheading Medusa — turned the monster to stone with the Gorgon's head. Perseus married Andromeda, and all the characters were later placed among the stars. The variable star Algol (Beta Persei) was associated with Medusa's winking eye, and its regular brightness changes were noted by ancient Egyptian astronomers as early as 1244 BC.

Observation Tips

The Perseus family constellations are best seen in autumn and winter from northern latitudes. Cassiopeia's distinctive W-shape is circumpolar from mid-northern latitudes and serves as a guide to finding the other family members. This region is exceptionally rich: the Andromeda Galaxy (M31) — the most distant object visible to the naked eye — lies in Andromeda, the Double Cluster (NGC 869/884) straddles Perseus, and the annual Perseid meteor shower (peaking in August) appears to radiate from Perseus.

HYG 118203HYG 118258HIP 8452HIP 8503HIP 8570HIP 8565HIP 8594HIP 8598HIP 8601HIP 8063HIP 8643HYG 118168HYG 118170HIP 8771HIP 8750HIP 8823HIP 8826HIP 8847HYG 118174HIP 8898HIP 9077HIP 9244HIP 9241HIP 9482HIP 9556HIP 9593HIP 9597HIP 9600HYG 118312HYG 118315Phi PerMiramMisamIot PerHIP 8118HIP 8170HIP 8182HIP 8295HIP 8696HIP 7126HIP 7171HIP 7257HIP 7495HIP 7498HIP 7538HIP 7729HIP 8742HIP 8929

Frequently Asked Questions

What is the Perseus constellation?
Perseus (Per) is one of the 88 IAU-recognized constellations in the Northern hemisphere. Perseus, the Hero, is a northern constellation named after the Greek hero who slew Medusa. It contains Algol (Beta Persei), the most famous eclipsing binary star, whose regular brightness variations w
How many stars are cataloged in Perseus?
StarFYI currently catalogs 2,000 stars in the constellation Perseus.
What is the brightest star in Perseus?
The brightest star in Perseus is Mirfak.
How large is the Perseus constellation?
Perseus covers 614.99 square degrees of the sky.
What family does Perseus belong to?
Perseus belongs to the Perseus Family of constellations.