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右攝提一

右摄提一
右摄提一的位置 (红圈处)
觀測資料
曆元 J2000
星座 牧夫座
星官 右摄提 (星官)亢宿
赤經 13h 54m 41.07892s
赤緯 +18° 23′ 51.7946″
視星等(V) 2.68
特性
光谱分类G0IV
U−B 色指数0.21
B−V 色指数0.58
R−I 色指数0.2
天体测定
徑向速度 (Rv)-1.6 km/s
自行 (μ) 赤经:-60.95 mas/yr
赤纬:-356.29 mas/yr
视差 (π)87.75 ± 1.24 mas
距离37.2 ± 0.5 ly
(11.4 ± 0.2 pc)
绝对星等 (MV)2.4
詳細資料
質量1.6 M
半徑2.8 R
亮度9 L
溫度6,100 K
金属量 [Fe/H]0.27 dex
自轉速度 (v sin i)11.8 km/s
年齡2.7 Gyr
其他命名
BD+19 2725,SAO 100766,HD 121370,HR 5235
參考資料庫
SIMBAD资料

右摄提一η Boo/牧夫座η),英文名Muphrid,是一个位于牧夫座的恒星。自从1943年,这个恒星的光谱被作为分类其它恒星的参考点之一。

特性

[编辑]

右摄提一是一个次巨星,已经开始从主序星演化为红巨星的过程。它有大约1.6倍太阳质量和2.8倍太阳半径。估计该星年龄为27亿年。基于它的光谱,牧夫座η在比重的元素中有明显的超量。事实上和氢的比例被认为接近银河盘面矮星的上限了。这是一个怀疑的光谱联星,有一个494天的周期,但是这个伴星并没有在散斑成像中被确认。测量不排除有一个恒星分类M7的低质量伴星。

右摄提一在地球的星空看起来和显目的亮星大角星很接近,事实上大角星是距离该星最近的邻居,因此两星距离太阳都有相似的距离。这两个恒星相距3.24光年,在各自的星空中都会是最亮星。在环绕牧夫座η的假想行星上看大角星为-5.2等(约为地球上看大角星的120倍亮,或是大约两倍金星的亮度)在环绕大角星的假想行星看牧夫座η会有-2.4等,超过地球上看天狼星的两倍亮。

参考文献

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右攝提一
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