Pi1 Pegasi, Latinized from π1 Pegasi, is a star in the constellation Pegasus. Based upon changes to the proper motion of the visible component, this is a probable astrometric binary.[9] It has a yellow hue and is dimply visible to the naked eye with a combined apparent visual magnitude of +5.58.[2] The system is located approximately 319 light years distant from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +5 km/s.[4] It is a member of the Ursa Major Moving Group of co-moving stars.[10]
The visible component is an aging giant star with a stellar classification of G8IIIb.[3] It has a high rate of spin, with a projected rotational velocity of 135 km/s.[7] This is giving it an equatorial bulge that is 17% larger than the polar radius.[11] It is a shell star, being orbited by a circumstellar shell of cooler gas.[12][13] This star is 530[6] million years old with 2.5[6] times the mass of the Sun. With the supply of hydrogen exhausted at its core, the star has cooled and expanded to 11[1] times the Sun's radius. It is radiating 63[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,898 K.[1]
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