Gamma Pegasi

"Algenib" redirects here. For the another star named Algenib, see Alpha Persei.
Gamma Pegasi
Location of γ Pegasi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 00h 13m 14.15123s[1]
Declination +15° 11′ 00.9368″[1]
Apparent magnitude (V) +2.78 to 2.89[2]
Characteristics
Spectral type B2 IV[3]
U−B color index −0.85[4]
B−V color index −0.23[4]
Variable type β Cep[5]
Astrometry
Radial velocity (Rv)+4.1[6] km/s
Proper motion (μ) RA: +1.98 mas/yr[1]
Dec.: –9.28 mas/yr[1]
Parallax (π)6.9474 ± 0.4293 mas[7]
Distance470 ± 30 ly
(144 ± 9 pc)
Absolute magnitude (MV)−2.64[8]
Details
Mass8.9±0.1[3] M☉
Radius4.80±0.39[9] R☉
Luminosity5,840[10] L☉
Surface gravity (log g)3.98±0.06[9] cgs
Temperature21,179±237[9] K
Metallicity [Fe/H]−0.34[11] dex
Rotational velocity (v sin i)0[12] km/s
Age18.7±3.2[3] Myr
Other designations
Algenib, gam Peg, 88 Peg, FK5 7, HD 886, HIP 1067, HR 39, SAO 91781[13]
Database references
SIMBADdata

Gamma Pegasi is a star in the constellation of Pegasus, located at the southeast corner of the asterism known as the Great Square. It has the formal name Algenib /ælˈdʒiːnɪb/;[14][15] the Bayer designation Gamma Pegasi is Latinized from γ Pegasi and abbreviated Gamma Peg or γ Peg. The average apparent visual magnitude of +2.84[4] makes this the fourth-brightest star in the constellation. The distance to this star has been measured using the parallax technique, yielding a value of roughly 470 light-years (144 parsecs).

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