Alpha Corvi
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Corvus |
| Right ascension | 12h 08m 24.81652s[1] |
| Declination | −24° 43′ 43.9504″[1] |
| Apparent magnitude (V) | 4.03[2] |
| Characteristics | |
| Spectral type | F1 V[3] |
| U−B color index | +0.00[2] |
| B−V color index | +0.34[2] |
| Astrometry | |
| Radial velocity (Rv) | +3.0[4] km/s |
| Proper motion (μ) | RA: 99.52[1] mas/yr Dec.: −39.19[1] mas/yr |
| Parallax (π) | 66.95 ± 0.15[1] mas |
| Distance | 48.7 ± 0.1 ly (14.94 ± 0.03 pc) |
| Absolute magnitude (MV) | 3.25[5] |
| Details | |
| Mass | 1.39[6] M☉ |
| Luminosity | 4.91[7] L☉ |
| Surface gravity (log g) | 4.13 ± 0.05[8] cgs |
| Temperature | 7,041 ± 53[8] K |
| Metallicity [Fe/H] | −0.19 ± 0.04[8] dex |
| Rotational velocity (v sin i) | 16.9 ± 1.5[9] km/s |
| Other designations | |
Alpha Corvi (α Crv, α Corvi) is a star in the constellation Corvus. It has the traditional names Alchiba (Arabic ألخبا al-xibā "tent") or Al Minliar al Ghurab.
Al Minliar al Ghurab (Arabic منقار الغراب al-manxar al-ghurab) or Minkar al Ghurab appeared in the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, which was translated into Latin as Rostrum Corvi (beak of the crow).[11]
In Chinese astronomy, Alchiba is called 右轄, Pinyin: Yòuxiá, meaning Right Linchpin, because it stands alone in the Right Linchpin asterism, Chariot mansion (see: Chinese constellation),[12] 右轄 (Yòuxiá), westernized into Yew Hea by R.H. Allen.[13]
Alchiba belongs to the spectral class F1V and has apparent magnitude +4.00. It is 48.7 ± 0.1 light years from Earth.[1] This star exhibits periodic changes in its spectrum over a three day period, which suggests it is either a spectroscopic binary or (more likely) a pulsating Gamma Doradus-type variable.[6]
In culture
USS Alchiba (AKA-6) is a former United States Navy ship.
See also
References
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- Alpha Corvi by Professor Jim Kaler.
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- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 22 日
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