Alpha Coronae Australis
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Corona Australis |
| Right ascension | 19h 09m 28.3417s |
| Declination | –37° 54′ 16.108″ |
| Apparent magnitude (V) | 4.102 |
| Absolute magnitude (V) | –0.22[1] |
| Distance | 130 ly (39.8 pc) |
| Spectral type | A2V |
| Other designations | |
Alpha Coronae Australis (α CrA, α Coronae Australis) is a star in the constellation Corona Australis. It is the only star in the constellation with a proper name, Alphekka Meridiana (Alphekka South), after the brightest star in Corona Borealis, Alphecca. It is known as 鱉六 (the Sixth Star of the River Turtle) in Chinese.
In Chinese, 鱉 (Biē), meaning River Turtle, refers to an asterism consisting of α Coronae Australis, α Telescopii, η1Coronae Australis, ζ Coronae Australis, δ Coronae Australis, β Coronae Australis, γ Coronae Australis, ε Coronae Australis, HD 175362, κ2 Coronae Australis and θ Coronae Australis.[2] Consequently, α Coronae Australis itself is known as 鱉六 (Biēliù, English: the Sixth Star of River Turtle.)[3].
[edit] Structure
Alpha Coronae Australis belongs to the spectral class A2V and has apparent magnitude +4.10. It is about 130 light years from Earth. This star is roughly 254 million years old.[4] This star has more than five times the mass of the Sun and 2.6 times the Sun's radius. It is radiating 117 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 9.462 K.[1]
The actual magnitude is 2. 32
[edit] References
- ^ a b North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics 334: 181-187, Bibcode 1998A&A...334..181N
- ^ (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.
- ^
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