Theta Pegasi
 Location of θ Pegasi (circled) |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 10m 11.98528s |
| Declination | +06° 11′ 52.3078″ |
| Apparent magnitude (V) | +3.53 |
| Characteristics | |
| Spectral type | A2V |
| Astrometry | |
| Radial velocity (Rv) | −7.90 km/s |
| Proper motion (μ) |
RA: +282.18 mas/yr Dec.: +30.46 mas/yr |
| Parallax (π) | 35.34 ± 0.85mas |
| Distance | 92 ± 2 ly (28.3 ± 0.7 pc) |
| Details | |
| Mass | 1.848 M☉ |
| Radius | 2.6225±0.0829 R☉ |
| Luminosity | 23.7012±1.1418 L☉ |
| Temperature | 7872±82 K |
| Metallicity [Fe/H] | −0.38 dex |
| Age | 1.1 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Theta Pegasi (θ Pegasi, abbreviated Theta Peg, θ Peg), also named Biham, is a star in the constellation of Pegasus.
θ Pegasi (Latinised to Theta Pegasi) is the star's Bayer designation.
It bore the traditional name Biham or Baham from the Arabic phrase s'ad al Biham "Lucky Stars of the Young Beasts". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name Biham for this star on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names.
In Chinese, 危宿 (Wēi Sù), meaning Rooftop, refers to an asterism consisting of Theta Pegasi, Alpha Aquarii and Epsilon Pegasi. Consequently, Theta Pegasi itself is known as 危宿二 (Wēi Sù èr, English: the Second Star of Rooftop.)
Theta Pegasi is of spectral class A2 and has apparent magnitude +3.53. It is approximately 97 light years from Earth. This star has 2.6 times the Sun's radius and it is radiating 25 times the luminosity of the Sun from its outer envelope at an effective temperature of 7,951 K.
...
Wikipedia