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蛇首二(网罟座β)是位于网罟座双星系统,其视星等为3.84[2]

蛇首二
Diagram showing star positions and boundaries of the Reticulum constellation and its surroundings
Cercle rouge 100%.svg

蛇首二的位置(红圈处)
觀測資料
曆元 J2000.0
星座 网罟座
星官
赤經 03h 44m 11.97587s[1]
赤緯 −64° 48′ 24.8610″[1]
視星等(V) +3.84[2]
特性
光谱分类K0IV SB[3]
U−B 色指数+1.11[2]
B−V 色指数+1.13[2]
天体测定
徑向速度 (Rv)51.1±4.1[4] km/s
自行 (μ) 赤经:+307.13[1] mas/yr
赤纬:+77.50[1] mas/yr
视差 (π)33.49 ± 0.53[1] mas
距离97 ± 2 ly
(29.9 ± 0.5 pc)
绝对星等 (MV)+1.46±0.03[3]
軌道[3]
绕行周期 (P)1,918.31±0.73 d
半长轴 (a)27.8±0.46 mas
偏心率 (e)0.33461±0.00035
倾斜角 (i)82.85±3.0°
升交点黄经 (Ω)16±4.4°
近心点 历元 (T)2452806.14 ± 0.33
近心点幅角 (ω)
(secondary)
42.023±0.084°
半振幅 (K1)
(primary)
5.1235±0.0025 km/s
詳細資料
β Ret A
質量1.2±0.2[3] M
半徑9.3±0.4[3] R
溫度4,580±80[3] K
年齡5–6[3] Gyr
β Ret B
質量0.4±0.1[3] M
其他命名
β Ret, CPD−65° 263, FK5 141, HD 23817, HIP 17440, HR 1175, SAO 248877, WDS J03442-6448A.[5]
參考資料庫
SIMBADdata


参考文献编辑

  1. ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752, doi:10.1051/0004-6361:20078357. 
  2. ^ 2.0 2.1 2.2 2.3 Mermilliod, J.-C., Compilation of Eggen's UBV data, transformed to UBV (unpublished), Catalogue of Eggen's UBV data (SIMBAD), 1986, Bibcode:1986EgUBV........0M. 
  3. ^ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Ramm, D. J.; 等, Spectroscopic orbits for K giants β Reticuli and ν Octantis: what is causing a low-amplitude radial velocity resonant perturbation in ν Oct?, Monthly Notices of the Royal Astronomical Society, April 2009, 394 (3): 1695−1710, Bibcode:2009MNRAS.394.1695R, doi:10.1111/j.1365-2966.2009.14459.x. 
  4. ^ de Bruijne, J. H. J.; Eilers, A.-C., Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project, Astronomy & Astrophysics, October 2012, 546: 14, Bibcode:2012A&A...546A..61D, arXiv:1208.3048, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ * bet Ret. SIMBAD. 斯特拉斯堡天文資料中心. [2017-02-13].