Xi Scorpii

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Template:Short description Template:Sky

Xi Scorpii Template:Starbox observe 3s
Characteristics
ξ Sco ABC
Spectral type F4(V) + F6(V) + G1V[1]
U−B Template:Engvar +0.00[2]
B−V Template:Engvar +0.45[2]
Components DE
Spectral type K1(V) + K1(V)[3]
U−B Template:Engvar +0.315[2]
B−V Template:Engvar +0.75[2]
Astrometry
ξ Sco ABC
Radial velocity (Rv)Template:Val[4] km/s
Proper motion (μ) RA: −63.2[5] mas/yr
Dec.: −27.0[5] mas/yr
Component D
Radial velocity (Rv)Template:Val[6] km/s
Proper motion (μ) RA: −61.607[6] mas/yr
Dec.: −22.227[6] mas/yr
Parallax (π)35.8898±0.0200 mas[6]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)4.47[7]
Component E
Radial velocity (Rv)Template:Val[8] km/s
Proper motion (μ) RA: −56.334[8] mas/yr
Dec.: −20.357[8] mas/yr
Parallax (π)35.8718±0.0237 mas[8]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)5.18[7]
Orbit[9]
Primaryξ Sco A
Companionξ Sco B
Period (P)Template:Val yr
Semi-major axis (a)Template:Val″
Eccentricity (e)Template:Val
Inclination (i)Template:Val°
Longitude of the node (Ω)Template:Val°
Periastron epoch (T)B Template:Val
Argument of periastron (ω)
(secondary)		Template:Val°
Orbit[9]
Primaryξ Sco AB
Companionξ Sco C
Period (P)1514.43 yr
Semi-major axis (a)7.755″
Eccentricity (e)0.041
Inclination (i)131.5°
Longitude of the node (Ω)47.4°
Periastron epoch (T)B 2226.10
Argument of periastron (ω)
(secondary)		59.3°
Details
A
Mass1.53[10] Template:Solar mass
Temperature6,532[10] K
B
Mass1.53[10] Template:Solar mass
Temperature6,532[10] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
C
Mass1.00[10] Template:Solar mass
Temperature5,705[10] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
D
Mass0.89[6] Template:Solar mass
Radius0.94[6] Template:Solar radius
Luminosity0.71[6] Template:Solar luminosity
Surface gravity (log g)4.49[11] cgs
Temperature5,529[11] K
Age2.3[12] Gyr
E
Mass0.88[8] Template:Solar mass
Radius0.77[8] Template:Solar radius
Luminosity0.44[8] Template:Solar luminosity
Surface gravity (log g)4.54[11] cgs
Temperature5,217[11] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Age2.3[12] Gyr
Other designations
Components ABC: Template:Odlist
ξ Sco A: Template:Odlist
ξ Sco B: Template:Odlist
ξ Sco C: Template:Odlist
Other designations
Components DE: Template:Odlist
Component D: Template:Odlist
Component E: Template:Odlist
Database references
SIMBADξ Sco ABC
ξ Sco AB
ξ Sco A
ξ Sco B
ξ Sco C
Component D
Component E
ARICNSξ Sco A
ξ Sco B
ξ Sco C

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Xi Scorpii (ξ Sco) is part of a quintuple star system in the constellation Scorpius. It was assigned this designation by Bayer, although Ptolemy had catalogued the star in Libra. Flamsteed assigned it the designation 51 Librae, but this has fallen out of use since modern constellation boundaries assign the star to Scorpius.[13]

Nomenclature

ξ Scorpii (Latinized to Xi Scorpii) is the star's Bayer designation. Xi Scorpii has no proper name, though it was erroneously known as Graffias before that name was applied to Beta Scorpii.[14] Its Flamsteed designation is 51 Librae.[13] When the modern constellation boundaries were drawn, Xi Scorpii was assigned to Scorpius, and the Flamsteed designation fell out of use.

The five stars of the Xi Scorpii system all have different designations, plus some designations that apply to more than one star. Xi Scorpii A, B, and C appear very close together in the sky and are typically grouped under a single multiple star designation, while components D and E are usually grouped under a separate multiple star designation designation. For example, Struve's catalogue of multiple stars includes the pair AB and C as Σ1998[15] and the pair D and E as Σ1999.[16]

Component Bayer HR HD SAO HIP GJ
A ξ Scorpii 5978 144070 159665 78727 9540
B 5977 144069
C none none 159666
D none none 144087 159668 78738 9541
E none none 144088 159670 78739

Properties

The Xi Scorpii system consists of five stars in two groups separated by about 4.7 arcminutes (or 0.08°) on the sky.[17]

The brighter group contains Xi Scorpii A, B, and C. A and B are both yellow-white F-type stars. A is slightly brighter and warmer.[1] They are separated by 0.744 arcseconds on average, and orbit around a common center once every 45.9 years.[9] The dimmer, seventh-magnitude Xi Scorpii C orbits this pair at about ten times the distance, having a separation of around 7.6 arcseconds.[9]

The second group contains components D and E, both K-type main-sequence stars, separated by about 11.9 arcseconds. They are known to be associated to each other and with the rest of the stars, because all stars share similar proper motions.[17]

References

Template:Reflist

External links

  • Template:WikiSky
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Template:Stars of Scorpius

  1. ↑ a b Script error: No such module "Citation/CS1".
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  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named PPM
  6. ↑ a b c d e f g Template:Cite Gaia DR3
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  8. ↑ a b c d e f g Template:Cite Gaia DR3
  9. ↑ a b c d Script error: No such module "citation/CS1".
  10. ↑ a b c d e f Script error: No such module "Citation/CS1".
  11. ↑ a b c d Script error: No such module "Citation/CS1".
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  13. ↑ a b Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Template:Cite simbad
  16. ↑ Template:Cite simbad
  17. ↑ a b Script error: No such module "Citation/CS1".
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