2 Pegasi

2 Pegasi is a single star in the constellation Pegasus, located approximately 394 light years away from the Sun based on parallax. It is visible to the naked eye as a faint, red-hued star with an apparent visual magnitude of 4.52. The object is moving closer to the Earth with a heliocentric radial velocity of −19 km/s. It has a magnitude 12.7 visual companion, designated component B, at an angular separation of .

This is an aging red giant star with a stellar classification of M1+III, currently on the asymptotic giant branch, having exhausted the hydrogen at its core and evolved away from the main sequence. The interferometry-measured angular diameter of the primary component, after correcting for limb darkening, is , which, at its estimated distance, equates to a physical radius of about 59 times the radius of the Sun. It is radiating 653 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of , and the radius calculated from these values is .

References

Category:M-type giants
Category:Suspected variables
Category:Pegasus (constellation)
BD+23 4325
Pegasi, 02
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