Theta Pegasi

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θ Pegasi
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pegasus
Right ascension 22h 10m 12s
Declination +06° 11′ 52″
Apparent magnitude (V) +3.53
Distance 96,6[1] ly
Spectral type A2 Vp
Other designations
Baham, 26 Peg, FK5 834, HD 210418, HR 8450, SAO 127340.

Theta Pegasi (θ Peg) is a star in the constellation Pegasus. It has the traditional name Biham or Baham from the phrase s'ad al Biham, "Lucky Stars of the Young Beasts".[2]

In Chinese, 危宿 (Wēi Sù), meaning Rooftop, refers to an asterism consisting of θ Pegasi, α Aquarii and ε Pegasi.[3] Consequently, θ Pegasi itself is known as 危宿二 (Wēi Sù èr, English: the Second Star of Rooftop.)[4]

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.[5]


  1. ^
  2. ^ Kaler
  3. ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  4. ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
  5. ^ Boyajian, Tabetha S.; et al. (February 2012), "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars", The Astrophysical Journal 746 (1): 101, arXiv:1112.3316, Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101 . See Table 10.

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