Xi Cephei

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Template:Short description

ξ Cephei
Template:Location mark
Location of ξ Cephei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
A
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.45[2] (4.61 + 6.50)‍[3]
B
Right ascension Template:RA[4]
Declination Template:DEC[4]
Apparent magnitude (V) 6.34[5]
Characteristics
A
Spectral type kA2.5hF2mF2(IV)[6] (A3Vm + F2III)‍[3]
B
Evolutionary stage main sequence[4]
Spectral type F8V[7]
Astrometry
A
Radial velocity (Rv)Script error: No such module "val".[8] km/s
Proper motion (μ) RA: +212.563[1] mas/yr
Dec.: +89.058[1] mas/yr
Parallax (π)32.12±0.8066 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
B
Radial velocity (Rv)Script error: No such module "val".[8] km/s
Proper motion (μ) RA: +202.094[4] mas/yr
Dec.: +81/933[4] mas/yr
Parallax (π)32.1835±0.0184 mas[4]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Orbit[9]
Period (P)Script error: No such module "val". years
Semi-major axis (a)Script error: No such module "val".″
Eccentricity (e)Script error: No such module "val".
Inclination (i)Script error: No such module "val".°
Longitude of the node (Ω)Script error: No such module "val".°
Periastron epoch (T)Script error: No such module "val".
Argument of periastron (ω)
(secondary)		Script error: No such module "val".°
Semi-amplitude (K1)
(primary)		7.81[10] km/s
Semi-amplitude (K2)
(secondary)		19.98[10] km/s
Details
Aa
MassScript error: No such module "val".[9] Template:Solar mass
Luminosity6.6[11] Template:Solar luminosity
Temperature7,943[11] K
Age200[11] Myr
Ab
Mass0.512[9]Template:Efn Template:Solar mass
Luminosity1.8[11] Template:Solar luminosity
Temperature6,310[11] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Age525[11] Myr
B
Mass1.14[4] Template:Solar mass
Radius1.28[4] Template:Solar radius
Luminosity2.08[4] Template:Solar luminosity
Surface gravity (log g)4.26[4] cgs
Temperature6,123[4] K
Age3.98[4] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Kurhah, 17 Cephei, BD+63°1802, CCDM J22038+2407, HIP 108917, HR 8417, SAO 19827, WDS J22038+6438
A: HD 209790
B: HD 209791
Database references
SIMBADξ
A
B

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Xi Cephei (ξ Cephei, abbreviated Xi Cep, ξ Cep) is a multiple star system in the constellation of Cepheus. It is approximately 102 light-years from Earth and has an apparent magnitude for all the components combined of 4.29.[12]

It consists of a binary star, designated Xi Cephei A, together with a more distant companion, Xi Cephei B. A's two components are themselves designated Xi Cephei Aa (officially named Kurhah Template:IPAc-en, the traditional name of the system)[13] and Ab.

Nomenclature

ξ Cephei (Latinised to Xi Cephei) is the system's Bayer designation. The designations of the three constituents as ξ Cephei A, B and C, and those of A's components - ξ Cephei Aa and Ab - derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).[14]

Xi Cephei bore the traditional names Kurhah, Alkirdah or Al Kirduh,[15] the name coming from Qazvini who gave Al Ḳurḥaḥ (القرحة al-qurhah), an Arabic word Ideler translated as a white spot, or blaze, in the face of a horse. Allen indicates that Ideler felt this was not a proper name for a star, and suggested the name Al Ḳirdah (ألقردة al qírada "the Ape").[16] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[17] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems.[18] It approved the name Kurhah for the component Xi Cephei Aa on 12 September 2016 and it is now so included in the List of IAU-approved Star Names.[13]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Hook, refers to an asterism consisting of Xi Cephei, 4 Cephei, HD 194298, Eta Cephei, Theta Cephei, Alpha Cephei, 26 Cephei, Iota Cephei and Omicron Cephei.[19] Consequently, the Chinese name for Xi Cephei itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[20]

Properties

Xi Cephei A is a double-lined spectroscopic binary system with an orbital period of 820 days and an eccentricity of 0.5.[10] The primary, component Aa, is a chemically peculiar Am star with an apparent magnitude of +4.61. The spectroscopic secondary, component Ab, is an F-type star.[3]

Eight arcseconds away from Xi Cephei A, Xi Cephei B is a 6th-magnitude main sequence star.[3]

Xi Cephei C is a 13th magnitude star nearly two arcminutes away.[21] It has a small parallax and is an unrelated background star only accidentally in line with Xi Cephei.[22]

Notes

Template:Notelist

References

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  1. ↑ a b c d e Template:Cite Gaia DR3
  2. ↑ Script error: No such module "Citation/CS1".
  3. ↑ a b c d Script error: No such module "Citation/CS1".
  4. ↑ a b c d e f g h i j k l Template:Cite Gaia DR3
  5. ↑ Script error: No such module "Citation/CS1".
  6. ↑ 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".
  9. ↑ a b c Script error: No such module "Citation/CS1".
  10. ↑ a b c Script error: No such module "Citation/CS1".
  11. ↑ a b c d e f 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. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".
  19. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  20. ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
  21. ↑ Script error: No such module "Citation/CS1".
  22. ↑ Template:Cite Gaia DR3

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Template:Stars of Cepheus

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