Pegasus Constellation: Facts & Notable Features

By Kim Ann Zimmermann, Space.com Contributor | November 9, 2018 05:25pm ET

Pegasus is a prominent constellation in the northern sky, named after a winged horse in Greek mythology. The constellation is one of the older ones known in the night sky: It is one of the 48 constellations listed by the second-century astronomer Ptolemy. Today, Pegasus is one of the 88 constellations officially recognized by the International Astronomical Union (IAU).
In the Northern Hemisphere, the constellation is high in the sky starting near the end of summer and continuing through autumn. If you are below the equator, look for Pegasus in late winter and through spring.

The constellation is famous for hosting the first exoplanet ever found around a normal star, as well as a galaxy known as M15.

Major stars
When observers look at the constellation Pegasus, the part that stands out is the Square of Pegasus – a major asterism, or group of stars that is smaller than a constellation. The square is made up of four stars that are of nearly equal brightness, when seen from Earth. These four stars are named Scheat, Alpheratz, Markab and Algenib.

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