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閣道四

閣道四(仙后座μA/B)
觀測資料
曆元 J2000
星座 仙后座
星官 閣道(奎宿)
赤經 01h08m16.4s
赤緯 +54°55′13″
視星等(V) 5.17/11
特性
光谱分类G5VIp/M5V
U−B 色指数0.10
B−V 色指数0.69
变星类型Suspected
天体测定
徑向速度 (Rv)-98.1 km/s
自行 (μ) 赤经:3,421.44 mas/yr
赤纬:-1,599.27 mas/yr
视差 (π)130.288 ± 0.57 mas
距离25.0 ± 0.1 ly
(7.68 ± 0.03 pc)
绝对星等 (MV)5.78/11.6
軌道
伴星仙后座μB
繞行週期 (P)21.40 yr
半長軸 (a)0.189"
偏心率 (e)0.62
倾斜角 (i)110.0°
升交点黃經 (Ω)227.3°
近心点 曆元 (T)1975.80
詳細資料
質量0.60/0.17 M
半徑0.74/0.29 R
亮度0.46/0.001 L
溫度5290 K
金屬量13-28%
自轉?
年齡5.9 × 109 [1]
其他命名
30 Cassiopeiae, Gl 53, HR 321, BD+54°223, HD 6582, LHS 8, LTT 10460, GCTP 219.00, SAO 22024, FK5 1030, LFT 107, HIP 5336, GC 1360, CCDM J01080+5455
拜耳星表中的仙后座,圓圈中的就是閣道四(仙后座μ)。

閣道四 (仙后座μ)是在仙后座的一顆聯星系統,並與仙后座θ共享英文名字 Marfak和中文的名稱。

這個靠近的聯星系統是在1961年被發現的,從那時候開始,這兩顆恆星的軌道元素久已經很清楚的被瞭解,這兩顆星的距離範圍在0.54–2.30天文單位。與附近的恆星比較,這兩顆星相對於銀河系的速度較高,以167 km/s在星系中穿越。它們的金屬量低。數於第二星族,被認為最先出現和形成的位置是在銀河盤面上。

參考資料

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  1. ^ Mamajek, Eric E.; Hillenbrand, Lynne A. Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics. The Astrophysical Journal. November 2008, 687 (2): 1264–1293. Bibcode:2008ApJ...687.1264M. doi:10.1086/591785. 

外部連結

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閣道四
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