Alpha Equulei
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Equuleus |
| Right ascension | 21h 15m 49.40s |
| Declination | +5° 14′ 53.1″ |
| Apparent magnitude (V) | +3.92 |
| Absolute magnitude (V) | +0.20;[1] +0.14 |
| Distance | 186 ly (57.05 pc) |
| Spectral type | G0 III+ |
| Other designations | |
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, is an asterism consisting of α Equulei and β Aquarii.[2] Consequently, α Equulei itself is known as 虛宿二 (Xū Sù èr, English: the Second Star of Emptiness.)[3]
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.
This star has 2.72 times the mass of the Sun, with a projected rotational velocity of 20.0 km s−1 and an estimated rotation period of 98.8 days.[1]
References
- ^ a b 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
- ^ Template:Zh icon 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.
- ^ Template:Zh icon 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.
External links
- "HD 202447 -- Spectroscopic binary". SIMBAD Astronomical Database. Retrieved 2007-01-22.
- Kaler: Kitalpha
