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井宿一

井宿一
观测资料
历元 J2000.0
星座 双子座[1][2]
星官 井宿
赤经 6h 22m 57.6s[1][2]
赤纬 +22° 30′ 49″[1][2]
视星等(V) 2.86[1][2]
特性
光谱分类M3III[1][2]
U−B 色指数1.85[1][2]
B−V 色指数1.64[1][2]
R−I 色指数1.38[1][2]
变星类型LB
天体测定
径向速度 (Rv)+54.38 ± 0.24 km/s
自行 (μ) 赤经:+56.39 mas/yr
赤纬:–110.03 mas/yr
视差 (π)14.08 ± 0.71 mas
距离230 ± 10 ly
(71 ± 4 pc)
绝对星等 (MV)−1.4
详细资料
质量2.1 M
亮度1,400 L
温度3,650 K
自转速度 (v sin i)8.4 km/s
其他命名
BD+22 1304,SAO 78297,HD 44478,HR 2286
参考数据库
SIMBAD资料

井宿一μ Gem/双子座μ),英文名Tejat,是北天星座双子座的一颗恒星。

特性

[编辑]
井宿一是左边的恒星, 被S249星云包围。在右边的亮星,靠近IC 443超新星残骸,是双子座η

井宿一的平均视星等为2.9,为双子座中第四亮的恒星。因为该星接近黄道,它可以被月球掩星。于依巴谷任务中的视差测量显示井宿一与地球的距离约为230光年(约71秒差距)。

井宿一是颗LB型慢不规则变星。其亮度在2.75到3.02间变化,变化周期为72日,长周期则为2000日。它是一颗属于恒星光谱M3 III的红巨星,表面温度约3,650K,代表着它比太阳更大,但表面温度却比太阳为低。该星目前在渐近巨星分支,产生能量的来源是环绕惰性碳氧核心的壳层氢氦聚变。

参考文献

[编辑]
  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Pulsating variable Star. SIMBAD. Centre de Données astronomiques de Strasbourg. [2012-07-13]. (原始内容存档于2019-08-20). 
  2. ^ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 VizieR Detailed Page. [2012-07-13]. (原始内容存档于2016-03-05). 


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井宿一
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