Pegasus

Pegasus, the Winged Horse, is a large northern constellation known for the Great Square of Pegasus asterism, formed by four bright stars that serve as a useful guide for finding other celestial objects. 51 Pegasi, a Sun-like star in this constellation, was the first solar-type star found to host an exoplanet (51 Pegasi b), a discovery that earned the 2019 Nobel Prize in Physics.

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.

HIP 117619HIP 117621HIP 117632HIP 117639HIP 117735HIP 117740HIP 117764HIP 117731HIP 117768HIP 117770HIP 117845HIP 117846HIP 117848HIP 117849HYG 119451HYG 119598HIP 121HIP 96HIP 136HIP 148HIP 149HIP 153HIP 162HIP 304HIP 348HIP 335HIP 502HIP 503HIP 504HIP 482HIP 540HIP 764HIP 773HIP 740HIP 748HIP 768HIP 790HIP 1135HIP 115625 Peg27Pi 1Peg28 Peg29Pi 2PegBiham30 Peg31 Peg32 Peg34 Peg

Frequently Asked Questions

What is the Pegasus constellation?
Pegasus (Peg) is one of the 88 IAU-recognized constellations in the Northern hemisphere. Pegasus, the Winged Horse, is a large northern constellation known for the Great Square of Pegasus asterism, formed by four bright stars that serve as a useful guide for finding other celestial object
How many stars are cataloged in Pegasus?
StarFYI currently catalogs 2,743 stars in the constellation Pegasus.
What is the brightest star in Pegasus?
The brightest star in Pegasus is Enif.
How large is the Pegasus constellation?
Pegasus covers 1120.79 square degrees of the sky.
What family does Pegasus belong to?
Pegasus belongs to the Perseus Family of constellations.