Alpha Corvi
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Corvus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.03[2] |
| Characteristics | |
| Spectral type | F1 V[3] + M4 V[4] |
| U−B Template:Engvar | +0.00[2] |
| B−V Template:Engvar | +0.34[2] |
| Variable type | Gamma Doradus?[5] |
| Astrometry | |
| Radial velocity (Rv) | +3.0[6] km/s |
| Proper motion (μ) | RA: +96.976 mas/yr[1] Dec.: Script error: No such module "val". mas/yr[1] |
| Parallax (π) | 66.7696±0.1804 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 3.25[7] |
| Details[8] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val".[9] dex |
| Rotational velocity (v sin i) | Script error: No such module "val".[10] km/s |
| Age | Script error: No such module "val".[9] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Alchiba, Al Minliar al Ghurab, Al Chiba, 1 Crv, CD−24°10174, GCTP 2796.00, GJ 455.3, GJ 9389, HD 105452, HIP 59199, HR 4623, SAO 180505[11] | |
| Database references | |
| SIMBAD | data |
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Alpha Corvi (α Corvi, abbreviated Alpha Crv, α Crv), also named Alchiba Template:IPAc-en,[12] is an F-type main-sequence star and, despite its "alpha" designation, is the fifth-brightest star in the constellation of Corvus. Based on parallax measurements made by the Gaia mission, it is approximately 49 light-years from the Sun.[1]
Nomenclature
α Corvi (Latinised to Alpha Corvi) is the star's Bayer designation.
It bore the traditional names Al Chiba (Template:Langx Script error: No such module "Lang"., 'tent') and Al Minliar al Ghurab (Arabic Script error: No such module "Lang". Script error: No such module "Lang".)[13] or Minkar al Ghurab. The latter appeared in the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, which was translated into Latin as Script error: No such module "Lang"., 'beak of the crow'.[14] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[15] to catalogue and standardize proper names for stars. The WGSN approved the name Alchiba for this star on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[12]
In Chinese astronomy, Alchiba is called Script error: No such module "Lang"., Pinyin: Script error: No such module "Lang"., meaning 'right linchpin', because it stands alone in the 'right linchpin' asterism, Chariot mansion (see: Chinese constellations),[16] Script error: No such module "Lang"., Script error: No such module "Lang". was westernized into Yew Hea by R.H. Allen.[13]
Namesake
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Properties
Alchiba has a spectral class F1V,[3] classifying it as a main sequence star fusing hydrogen into helium at its core. 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.[5] Alchiba has 34% more mass and is 42% larger than the Sun. It is 4.3 times more luminous and has a surface effective temperature of 6,985 K,[8] giving it the yellow-white hue of an F-type star.[17] The abundance of chemical elements other than hydrogen and helium, what astronomers name metallicity, is slightly lower than that of the Sun.[9]
Alpha Corvi has a common proper motion companion, named Alpha Corvi B (or Alchiba B), located about 3.1 arcsec away. It is a red dwarf with a spectral type of M4V.[4]
See also
References
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- ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 22 日 Template:Webarchive
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External links
- Alpha Corvi by Professor Jim Kaler.