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西咸一

(({name))}
观测数据
曆元 J2000      分点 J2000
星座 天蠍座
ξ Sco ABC
赤经 16h 04m 22.191s[1]
赤纬 -11° 22′ 22.60″[1]
星等 (V) 4.17[2]
(5.16 / 4.87 / 7.30)[3]
ξ Sco D
赤经 16h 04m 25.9261s[4]
赤纬 -11° 26′ 57.778″[4]
星等 (V) 7.43[5]
ξ Sco E
赤经 16h 04m 26.7184s[4]
赤纬 -11° 26′ 59.543″[4]
星等 (V) 7.81[6]
特性
光谱分类F4(V) + F6(V) + G1V[7]
U−B 色指数+0.00[8]
B−V 色指数+0.45[8]
天体测定
ξ Sco ABC
徑向速度 (Rv)-36.33 ± 0.83[9] km/s
自行 (μ) 赤经:-63.2[1] mas/yr
赤纬:-27.0[1] mas/yr
ξ Sco D
徑向速度 (Rv)-31.60 ± 0.2[10] km/s
自行 (μ) 赤经:-63.43[11] mas/yr
赤纬:-20.55[11] mas/yr
视差 (π)35.90 ± 0.23[4] mas
距离表达式错误:预期外的<运算符。 ly
(27.9 ± 0.2 pc)
軌道[3]
主星ξ Sco A
伴星ξ Sco B
繞行週期 (P)45.90 ± 0.60 yr
半長軸 (a)0.654 ± 0.006"
偏心率 (e)0.744 ± 0.001
倾斜角 (i)34.5 ± 1.0°
升交点黃經 (Ω)25.3 ± 4.0°
近心点 曆元 (T)B 1997.22 ± 0.02
近心點幅角 (ω)
(secondary)
163.8 ± 5.0°
軌道[3]
主星ξ Sco AB
伴星ξ Sco C
繞行週期 (P)1514.43 yr
半長軸 (a)7.755"
偏心率 (e)0.041
倾斜角 (i)131.5°
升交点黃經 (Ω)47.4°
近心点 曆元 (T)B 2226.10
近心點幅角 (ω)
(secondary)
59.3°
其他命名
Graffias,[12] ξ Sco, 51 Lib, HR 5977 + HR 5978, HD 144069 + HD 144070 + HD 144087 + HD 144088, SAO 159665, HIP 78727 + HIP 78738 + HIP 78739, ADS 9909 + ADS 9910, CCDM J16044-1123

))

參考資料庫
SIMBADξ Sco ABC
ξ Sco AB
ξ Sco A
ξ Sco B
ξ Sco C
ξ Sco D
ξ Sco E
ARICNSξ Sco A
ξ Sco B
ξ Sco C

西咸一,即天蠍座ξ(Xi Scorpiiξ Sco)或天秤座51(51 Librae),是一個在天球上位於天蠍座五合星系統[13]

名稱

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天蠍座ξ(ξ Scorpii,拉丁化為Latinized to Xi Scorpii)是西咸一的拜耳命名法名稱,並且它沒有佛蘭斯蒂德命名法的名稱或一個固有名稱。不過西咸一曾經被錯誤地稱為Graffias,而這稱呼也曾被用於房宿四 (天蠍座β)[14]。此外,西咸一曾經被編號為天秤座51 [13]。之後因為該星被劃分入天蠍座,該名稱已不再使用。

西咸一系統中的5顆行星各有不同編號。然而,各星表中有部分編號對應超過1顆恆星。天蠍座ξA、B和C這三顆恆星之間距離相當接近,在許多星表中是共用一個編號,而D和 E 有時也有自己的編號。

成員星 HR HD SAO HIP GJ
天蠍座ξA 5978 144070 159665 78727 9540
天蠍座ξB 5977 144069
天蠍座ξC none 159666
天蠍座ξD 144087 159668 78738 9541
天蠍座ξE 144088 159670 78739

恆星系統狀態

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西咸一是一個5合星系統,並且該系統可再分為兩個次系統,並且在天球上互相距離4.7角分(0.08°)[15]

亮度較高的次系統包含恆星天蠍座ξA、B和C。A和B是黃白色F型主序星,其中A星的光度與表面溫度稍高於B星[7]。A和B星在天球上平均相距0.744角秒,兩者以45.9年軌道週期互相環繞[3]。亮度較低的C(視星等7)則以A和B距離約10倍的軌道半徑環繞A和B,天球上距離約7.6角秒[3]

另一個包含天蠍座ξD和E星的次系統則都是K型主序星,兩者天球上相距11.9角秒。目前已知D和E星之間有重力交互作用,並且和系統另外3顆恆星之間也有重力作用,因為這幾顆恆星的自行值相接近[15]

另外距離D星81角秒還有一顆視星等11的天蠍座ξF,但目前仍無法確認該恆星是否與另外5顆恆星之間受到重力相互束縛。因此天文學家目前尚未確認F星是否為該系統成員星[來源請求]

參考資料

[编辑]
  1. ^ 1.0 1.1 1.2 1.3 Roeser, S.; Bastian, U. A new star catalogue of SAO type. Astronomy and Astrophysics Supplement Series. 1988, 74: 449–451. Bibcode:1988A&AS...74..449R. 
  2. ^ * ksi Sco. SIMBAD. 斯特拉斯堡天文資料中心. [2 August 2017]. 
  3. ^ 3.0 3.1 3.2 3.3 3.4 Sixth Catalog of Orbits of Visual Binary Stars. United States Naval Observatory. [2 July 2017]. (原始内容存档于2017-08-01). 
  4. ^ 4.0 4.1 4.2 4.3 4.4 Gaia Collaboration. Gaia Data Release 1. Astronomy & Astrophysics. 2016, 595: A2. Bibcode:2016A&A...595A...2G. arXiv:1609.04172可免费查阅. doi:10.1051/0004-6361/201629512. 
  5. ^ HD 144087. SIMBAD. 斯特拉斯堡天文資料中心. [2 August 2017]. 
  6. ^ HD 144088. SIMBAD. 斯特拉斯堡天文資料中心. [2 August 2017]. 
  7. ^ 7.0 7.1 Skiff, B. A. VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications. VizieR On-line Data Catalog. 2014, 1. Bibcode:2014yCat....1.2023S. 
  8. ^ 8.0 8.1 Mermilliod, J.-C. Compilation of Eggen's UBV data, transformed to UBV (unpublished). Catalogue of Eggen's UBV data. 1986 [2017-10-11]. Bibcode:1986EgUBV........0M. (原始内容存档于2019-12-08). 
  9. ^ Tokovinin, A. A.; Smekhov, M. G. Statistics of spectroscopic sub-systems in visual multiple stars. Astronomy & Astrophysics. 2002, 382: 118. Bibcode:2002A&A...382..118T. doi:10.1051/0004-6361:20011586. 
  10. ^ Gontcharov, G. A. Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system. Astronomy Letters. 2006, 32 (11): 759–771 [2017-10-11]. Bibcode:2006AstL...32..759G. arXiv:1606.08053可免费查阅. doi:10.1134/S1063773706110065. (原始内容存档于2018-08-08). 
  11. ^ 11.0 11.1 van Leeuwen, F.; et al. Validation of the new Hipparcos reduction. Astronomy and Astrophysics. 2007, 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752可免费查阅. doi:10.1051/0004-6361:20078357. 
  12. ^ Allen, R. H., (1899) Star-names and Their Meanings页面存档备份,存于互联网档案馆), New York: G. E. Stechert, p. 371.
  13. ^ 13.0 13.1 Wagman, M. Flamsteed's Missing Stars. Journal for the History of Astronomy. August 1987, 18 (3): 209. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305.  |number=|issue=只需其一 (帮助)
  14. ^ Allen, R. H. Star-names and Their Meanings. New York: G. E. Stechert. 1899: 371 [2017-10-11]. (原始内容存档于2019-06-14). 
  15. ^ 15.0 15.1 Tokovinin, A. A. MSC - a catalogue of physical multiple stars. Astronomy and Astrophysics Supplement Series. 1997, 124: 75 [2017-10-11]. Bibcode:1997A&AS..124...75T. doi:10.1051/aas:1997181. (原始内容存档于2017-06-20). 

外部連結

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西咸一
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