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)Template:Val
Eccentricity (e)0.34
Inclination (i)Template:Val°
Longitude of the node (Ω)Template:Val°
Periastron epoch (T)2416201.8 HJD
Argument of periastron (ω)
(primary)		19.8°
Details
MassTemplate: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 Template:Convert from the Earth.[17] The interferometry-measured angular diameter of the primary component, after correcting for limb darkening, is Template:Val,[18] which, at its estimated distance, equates to a physical radius of about 15 times the radius of the Sun.[8]

References

Template:Reflist

Template:Stars of Phoenix

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named dr3
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named sps1966
  3. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named aj132_1_161
  4. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named rgcrv
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Cardini2005
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named aaa442_1_365
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kervella
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named lang2006
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named charbonnel2020
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MgII
  11. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named costa2002
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  13. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Kunitzsch
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named iau
  15. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named allen1899
  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. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa474_2_653
  18. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named aaa431_773
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