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格利泽445

Gliese 445
觀測資料
曆元 J2000.0
星座 鹿豹座
星官
赤經 11h 47m 41.3771s[1]
赤緯 +78° 41′ 28.178″[1]
視星等(V) 10.78[1]
特性
光谱分类M3.5[1]
B−V 色指数1.6[1]
V−R 色指数0.8[1]
R−I 色指数0.8[1]
天体测定
徑向速度 (Rv)−119[1] km/s
自行 (μ) 赤经:743.58[1] mas/yr
赤纬:480.47[1] mas/yr
视差 (π)185.52 ± 1.43[1] mas
距离17.6 ± 0.1 ly
(5.39 ± 0.04 pc)
詳細資料
質量0.15[2]–0.30[3] M
半徑0.320[3] R
參考資料庫
SIMBAD资料
ARICNS资料
其他命名
Gliese 445, Gl 445, G 254-29, AC+79 3888, HIP 57544, LFT 849, LHS 2459, LTT 13235, NLTT 28539[1]

格利泽445Gl 445)是一颗M-型主序星,位于鹿豹座中,位置靠近北极星。它目前距离太阳大约17.6光年视星等则为10.8等。[1]北回归线以北的地区整晚都可以观测,但需要望远镜的协助,肉眼无法看到。[4]

旅行者1号

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这颗恒星值得注意之处在于美国宇航局旅行者1号探测器将于大约40000年后从距离它1.6光年的地方飞过。[5] 格利泽445是一颗红矮星,质量只有太阳的四分之一到三分之一,表面温度只有大约3240 K (2966.85°C),因此科学家们认为它的行星系不可能维持生命的存在。[4]

与太阳系相遇

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从20000年前到80000年后临近太阳的恒星的距离变化曲线

在旅行者1号探测器不断接近格利泽445的过程中,这颗恒星也在以每秒119千米径向速度高速地接近太阳。当四万年之后探测器距离这颗恒星最近时,格利泽445与太阳的距离将只有1.059秒差距(约合3.45光年),[2] 但是其光度仍不足肉眼的观察能力极限的一半。[4] 它将在这之后的数千年比其他任何一颗恒星离太阳都要近。[6]

X射线源

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格利泽445能释放出X射线[7]

参考文献

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  1. ^ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 LHS 2459 -- High proper-motion Star, database entry, SIMBAD. Accessed on line July 29, 2008.
  2. ^ 2.0 2.1 Bobylev, Vadim V. Searching for Stars Closely Encountering with the Solar System. Astronomy Letters. March 2010, 36 (3): 220–226. Bibcode:2010AstL...36..220B. arXiv:1003.2160可免费查阅. doi:10.1134/S1063773710030060. 
  3. ^ 3.0 3.1 AC+79 3888页面存档备份,存于互联网档案馆), entry, Catalogue of nearest stars until 10pc, V. A. Zakhozhaj, CDS ID V/101页面存档备份,存于互联网档案馆).
  4. ^ 4.0 4.1 4.2 Page 168, Planets Beyond: Discovering the Outer Solar System, Mark Littmann, Mineola, New York: Courier Dover Publications, 2004, ISBN 0-486-43602-0.
  5. ^ NASA – Voyager - Mission - Interstellar Mission. [2012-07-22]. (原始内容存档于2011-08-17). 
  6. ^ The Close Approach of Stars in the Solar Neighborhood. [2012-07-22]. (原始内容存档于2018-12-23). 
  7. ^ Schmitt JHMM, Fleming TA, Giampapa MS. The X-Ray View of the Low-Mass Stars in the Solar Neighborhood. Ap J. September 1995, 450 (9): 392–400. Bibcode:1995ApJ...450..392S. doi:10.1086/176149. 

外部链接

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格利泽445
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