Gamma Pegasi
 Location of γ Pegasi (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Pegasus |
| Right ascension | 00h 13m 14.15123s |
| Declination | +15° 11′ 00.9368″ |
| Apparent magnitude (V) | +2.84 |
| Characteristics | |
| Spectral type | B2 IV |
| U−B color index | –0.85 |
| B−V color index | –0.23 |
| Variable type | β Cep |
| Astrometry | |
| Radial velocity (Rv) | +4.1 km/s |
| Proper motion (μ) |
RA: +1.98 mas/yr Dec.: –9.28 mas/yr |
| Parallax (π) | 8.33 ± 0.53mas |
| Distance | 390 ± 20 ly (120 ± 8 pc) |
| Details | |
| Mass | 8.9 ± 0.1 M☉ |
| Radius | 4.80 ± 0.39 R☉ |
| Luminosity | 5,840 L☉ |
| Surface gravity (log g) | 3.98 ± 0.06 cgs |
| Temperature | 21,179 ± 237 K |
| Metallicity [Fe/H] | –0.34 dex |
| Rotational velocity (v sin i) | 0 km/s |
| Age | 18.7 ± 3.2 Myr |
| Other designations | |
Gamma Pegasi (γ Pegasi, abbreviated Gamma Peg or γ Peg), also named Algenib, is a star in the constellation of Pegasus, located at the southwest corner of the asterism known as the Great Square. The average apparent visual magnitude of +2.84 puts this at fourth place among the brightest stars in the constellation. The distance to this star has been measured using the parallax technique, yielding a value of roughly 390 light-years (120 parsecs) with a margin of error of 5%.
Gamma Pegasi is the star's Bayer designation. Although it also had the traditional name Algenib, this name was also used for Alpha Persei. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016 included a table of the first two batches of names approved by the WGSN; which included Algenib for this star (Alpha Persei was given the name Mirfak).
The asterism of γ Pegasi and α Andromedae, in Hindu astronomy, is called Uttara Bhādrapadā (उत्तरभाद्रपदा) or Uttṛṭṭāti. It is the 26th nakshatra. In Chinese, 壁宿 (Bìxiù), meaning Wall (asterism) refers to an asterism consisting of γ Pegasi and α Andromedae . Consequently, γ Pegasi itself is known as 壁宿一 (Bìxiù yī, English: the First Star of Wall.)
...
Wikipedia