Gamma Pegasi
Variable B-type star in the constellation Pegasus / From Wikipedia, the free encyclopedia
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"Algenib" redirects here. For the another star named Algenib, see Alpha Persei.
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).
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
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] |
Distance | 470 ± 30 ly (144 ± 9 pc) |
Absolute magnitude (MV) | −2.64[8] |
Details | |
Mass | 8.9±0.1[3] M☉ |
Radius | 4.80±0.39[9] R☉ |
Luminosity | 5,840[10] L☉ |
Surface gravity (log g) | 3.98±0.06[9] cgs |
Temperature | 21,179±237[9] K |
Metallicity [Fe/H] | −0.34[11] dex |
Rotational velocity (v sin i) | 0[12] km/s |
Age | 18.7±3.2[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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