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.

Algol10 Per11 Per14 Per16 Per22Pi Per30 Per39Del Per43 Per47Lam Per54 Per9 PerHIP 10204HIP 10251HIP 10361HIP 10379HIP 10391HIP 10434HIP 10443HIP 10463HIP 10475HIP 10588HIP 10604HIP 10612HIP 10615HIP 10624HIP 10628HIP 10633HIP 10636HIP 10641HIP 10653HIP 10656HIP 10660HIP 10674HIP 10707HIP 10713HIP 10791HIP 13486HIP 13488HIP 17015HIP 17016HIP 17019HIP 17022HIP 13500HIP 13501HIP 13504HIP 13512HIP 13521

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.