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恒星 › 武仙座

格利泽686

视星等
9.62
绝对星等
10.08
距离
26.4 光年8.09 秒差距
光谱型
M1M 型(红)
色指数 B−V
1.53
光度
0.0081太阳 = 1
赤经(J2000)
17h 37m 53.3s
赤纬(J2000)
+18° 35′ 30″
所在星座
武仙座
视向速度
-9.5 km/s
自行
赤经 +926.8、赤纬 +983.2 毫角秒 / 年
编号
HIP 86287 · Gl 686

百科

格利泽686 (GJ 686 / HIP 86287 / LHS 452)是一颗位于武仙座的红矮星,视星等为+9.577。尽管它距离太阳系很近,仅约26.5光年,但它并不是该星座中已知最近的恒星,因为格利泽661距离太阳系20.9光年。离这颗恒星最近的系统是明亮的天市左垣三,距离4.5光年。紧随其后的是GJ 1230和格利泽6673,距离分别为7.2和7.6光年。

格利泽686是太阳系附近众多红矮星之一,光谱类型为M1V,有效温度约为3600K。它在可见光谱中的亮度等于太阳亮度的 0.82%,而它的总光度相当于太阳亮度的 2.7%,因为这些物体发出的大量辐射星星是红外线不可见光。格利泽686比其他已知的红矮星要亮得多;因此,它的亮度是罗斯154的6.5倍,是离太阳系最近的恒星比邻星的15倍。

格利泽686的半径大约等于太阳半径的一半。其预计自转速度为2.5公里/秒,自转周期等于或小于10.3天。它的金属含量低于太阳;各种研究估计其金属丰度指数在 -0.25 和 -0.44 之间。它的质量大约为太阳质量的45%到49%,并且是一颗具有与拉卡伊9352相当的特性的恒星。

行星系统

通过径向速度法发现格利泽686有一个已知的超级地球类行星。

摘自中文维基百科「格利泽686」,按 CC BY-SA 4.0 使用。

英文维基百科

中文条目比较短,这里附上内容更多的英文维基百科条目原文(未翻译)。

Gliese 686 (GJ 686 / HIP 86287 / LHS 452) is a star in the constellation of Hercules, with an apparent magnitude +9.577. Although it is close to the Solar System – at 26.6 light-years – it is not the closest known star in its constellation, since Gliese 661 is 20.9 light years away. The closest system to this star is the bright μ Herculis, at 4.5 light years. They are followed by GJ 1230 and Gliese 673, at 7.2 and 7.6 light years respectively.

Gliese 686 is one of the many red dwarfs in the Solar System neighborhood with a spectral type of M1V, and has an effective temperature of about 3600 K. Its brightness in the visible spectrum is equal to 0.82% of that of the Sun, while its total luminosity is equivalent to 2.7% that of the Sun, since a significant amount of the radiation emitted by these stars is infrared invisible light. Considering only this last parameter, Gliese 686 is considerably brighter than other known red dwarfs: it is 6.5 times more luminous than Ross 154 and 15 times more than Proxima Centauri, the closest star to …

Gliese 686 has a radius approximately half that of the Sun. Its projected rotation speed is 2.5 km / s, its rotation period being equal to or less than 10.3 days. It has a metallic content lower than that of the Sun; various studies estimate its index metallicity between -0.25 and -0.44. It has an approximate mass between 45% and 49% of the solar mass and is a star with characteristics comparable to that of Lacaille 9352.

Planetary system

Gliese 686 has one known super-Earth planet detected by radial velocity. It is orbiting close to the host star with a separation of 0.091 AU (13.6 Gm) and an orbital period of 15.5 days. Since the inclination of its orbit is unknown, only a lower bound on its mass can be determined: it has at least 6.6 times the mass of the planet Earth.

以上取自英文维基百科「Gliese 686」(英文原文,未翻译),按 CC BY-SA 4.0 使用。

资料卡

类型
恒星、near-infrared source、rotating variable star
质量
0.42太阳 = 1
半径
0.42太阳 = 1

数据来自 Wikidata(CC0),数值已换算成常用单位。

行星系统

武仙座里的其他亮星

整个星座 ›
名称星座星等距离光谱
天市右垣一武仙座 β武仙座2.78139 光年G8III
帝座武仙座 α¹武仙座2.78360 光年M5IIvar
天纪二武仙座 ζ武仙座2.8135 光年F9IV
天市左垣一武仙座 δ武仙座3.1275.1 光年A3IVv SB
女床一武仙座 π武仙座3.16377 光年K3IIvar
天市左垣三武仙座 μ武仙座3.4227.1 光年G5IV
天纪增一武仙座 η武仙座3.48109 光年G8III-IV
中山增一武仙座 ξ武仙座3.70137 光年K0III
天市右垣二武仙座 γ武仙座3.74193 光年A9III
天棓五武仙座 ι武仙座3.82455 光年B3V SB
天市左垣四武仙座 ο武仙座3.84338 光年B9.5V
屠肆一武仙座 109武仙座3.85119 光年K2III