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霹雳二

霹雳二[1]
观测资料
历元 J2000.0
星座 双鱼座
星官 霹雳壁宿
赤经 23h 17m 9.9379s
赤纬 +3° 16' 56.240"
视星等(V) 3.69
特性
光谱分类G9III
U−B 色指数+0.572
B−V 色指数+0.924
变星类型?
天体测定
径向速度 (Rv)-13.6 km/s
自行 (μ) 赤经:760.35 mas/yr
赤纬:17.96 mas/yr
视差 (π)24.92 ± 0.89 mas
距离131 ± 5 ly
(40 ± 1 pc)
其他命名
Gamma Piscium, 6 Piscium, HR 8852, BD+02°4648, HD 219615, SAO 128085, HIP 114971, GC 32415

霹雳二γ Psc / 双鱼座γ)是双鱼座的第二亮,距离地球约130光年。它光谱型为G9III,颜色偏黄,表面温度为5,000到6,000度。这比太阳表面温度稍低。它半径为11倍太阳半径,光度为61倍太阳光度视星等为3.69。它在14亿年前曾经是一颗A2光谱型的白色恒星。[2]

据称[来源请求] 它俗名为Simmah,源于巴比伦的鱼神。

霹雳二在天空中每年移动3/4弧秒,这对应130光年之外对应的是145km/s。这意味着它是来自银河系另一部分的访客;从天文学意义上来说,它将很快远离太阳附近。它的金属量只有太阳的四分之一,可能它所来源的银盘外金属量较低,碳-氮含量也较低。[2] 霹雳二位于双鱼座一个称作“小环”的星群里。[3]

科幻中的霹雳二

[编辑]

Frank Herbert的Dune系列里,外屏双鱼座的中文名)γ是Imperial House Corrino的母系统(home system)。

参考资料

[编辑]
  1. ^ Simbad Query Result. Simbad. [September 30, 2007]. (原始内容存档于2016-03-04). 
  2. ^ 2.0 2.1 "Gamma Psc". [September 30, 2007]. (原始内容存档于2007-04-22). 
  3. ^ "SPACE.com -- SpaceWatch -- Pisces Rising". [September 30, 2007]. (原始内容存档于2010-07-13). 
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霹雳二
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