Alpha Phoenicis

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Template:Short description Template:Hatnote group

Alpha Phoenicis
Template:Location mark
Location of α Phoenicis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 2.377[2]
Characteristics
Spectral type K0.5 IIIb[3]
U−B Template:Engvar +0.903[2]
B−V Template:Engvar +1.092[2]
Astrometry
Radial velocity (Rv)+74.6[4] km/s
Proper motion (μ) RA: +176.268[1] mas/yr
Dec.: −398.872[1] mas/yr
Parallax (π)39.9183±0.7283 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)0.52[5]
Orbit[6]
Period (P)3848.8 days
Semi-major axis (a)Script error: No such module "val".Template:Efn
Eccentricity (e)0.34
Inclination (i)Script error: No such module "val".°
Longitude of the node (Ω)Script error: No such module "val".°
Periastron epoch (T)2416201.8 HJD
Argument of periastron (ω)
(primary)		19.8°
Details
MassScript error: No such module "val".[7] Template:Solar mass
Radius14.7[8] Template:Solar radius
Luminosity83[9] Template:Solar luminosity
Surface gravity (log g)2.53[3] cgs
Temperature4,700[10] K
Metallicity [Fe/H]−0.73[3] dex
Rotational velocity (v sin i)1.0[11] km/s
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Ankaa, Nair al Zaurak, Cymbae, Lucida Cymbae, CD−42°116, FK5 12, GCTP 71.00, HIP 2081, HR 99, HD 2261, LTT 231, SAO 215093.[12]
Database references
SIMBADdata

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Alpha Phoenicis (α Phoenicis, abbreviated Alpha Phe or α Phe), formally named Ankaa Template:IPAc-en,[13] (with the same pronunciation) is the brightest star in the constellation of Phoenix.

Nomenclature

Alpha Phoenicis is the star's Bayer designation. It also bore the traditional name Ankaa sometime after 1800, from the Arabic العنقاء al-ʽanqāʼ "the phoenix" for the name of the constellation.[13] The International Astronomical Union has formally adopted the Ankaa as the proper name for Alpha Phoenicis.[14]

Medieval Arab astronomers formed the constellation of the dhow (where Phoenix is), so another popular name for the star is Nair al Zaurak[15] from نائر الزورقnayyir az-zawraq "the bright (star) of the skiff". The Latin translation is Cymbae, from lūcida cumbae.[15]

In Chinese caused by adaptation of the European southern hemisphere constellations into the Chinese system, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Firebird, refers to an asterism consisting of α Phoenicis, ι Phoenicis, σ Phoenicis, ε Phoenicis, κ Phoenicis, μ Phoenicis, λ1 Phoenicis, β Phoenicis and γ Phoenicis . Consequently, α Phoenicis itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[16]

Description

Alpha Phoenicis is a spectroscopic binary star system with components that orbit each other every 3,848.8 days (10.5 years).[6] The combined stellar classification of the system is K0.5 IIIb,[3] which matches the spectrum of a normal luminosity giant star. It has an apparent visual magnitude of 2.4,[2] so it is somewhat outshone by its first magnitude neighbors Achernar (α Eridani) and Fomalhaut (α Piscis Austrinus). Based upon parallax measurements, this system is at a distance of about Script error: No such module "convert". from the Earth.[17] The interferometry-measured angular diameter of the primary component, after correcting for limb darkening, is Script error: No such module "val".,[18] which, at its estimated distance, equates to a physical radius of about 15 times the radius of the Sun.[8]

Notes

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References

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  1. ↑ a b c d e Template:Cite Gaia DR3
  2. ↑ a b c d Script error: No such module "citation/CS1".
  3. ↑ a b c d Script error: No such module "citation/CS1".
  4. ↑ Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "Citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".. The radius (R*) is given by:
    2⋅R*=(10−3⋅26⋅5.25) AU0.0046491 AU/R⨀≈29.4⋅R⨀
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ a b Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ a b Script error: No such module "citation/CS1".
  16. ↑ Template:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 27 日 Template:Webarchive
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".

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Template:Stars of Phoenix

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