Epoch J2000.0 Equinox J2000.0
|Right ascension||21h 15m 49.40s|
|Declination||+5° 14′ 53.1″|
|Apparent magnitude (V)||+3.92|
|Absolute magnitude (V)||+0.20|
|Spectral type||G0 III+|
Alpha Equulei (α Equ, α Equulei) is a star in the constellation Equuleus. It has the traditional name Kitalpha (rarely Kitel Phard or Kitalphar), a contraction of the Arabic name قطعة الفرس qiṭ‘a(t) al-faras "a piece of the horse".
In Chinese, 虚宿 (Xū Sù), meaning Emptiness (asterism), refers to an asterism consisting of α Equulei and β Aquarii. Consequently, α Equulei itself is known as 虛宿二 (Xū Sù èr, English: the Second Star of Emptiness.)
Alpha Equulei collectively belongs to spectral class G0III and has apparent magnitude +3.92 and a luminosity approximately 75 times that of the Sun. Alpha Equulei is a unique spectroscopic binary star consisting of two components. Kitalpha is approximately 186 light years from Earth.
- Pizzolato, N.; Maggio, A.; Sciortino, S. (September 2000), Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases, Astronomy and Astrophysics 361: 614–628, Bibcode:2000A&A...361..614P
- (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.
- (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.
- "HD 202447 -- Spectroscopic binary". SIMBAD Astronomical Database. Retrieved 2007-01-22.
- Kaler: Kitalpha