Epoch J2000.0 Equinox J2000.0
|Right ascension||00h 13m 14.2s|
|Declination||+15° 11' 01"|
|Apparent magnitude (V)||+2.83|
Gamma Pegasi (γ Peg) is a star in the constellation of Pegasus. It also has the traditional name Algenib; confusingly however, this name is also used for Alpha Persei. It is known as 壁宿一 (the First Star of the Wall) in Chinese.
Gamma Pegasi is a Beta Cephei variable star that lies at the lower left-hand corner of the Great Square of Pegasus. Its magnitude varies between +2.78 and +2.89 with a period of 3.6 hours. It is 335 light-years distant and belonges to spectral type B2. It has a total luminosity of 4000 times that of the Sun with a radius of 4.5 times solar.The mass of γ Pegasi is 7 to 10 solar masses.