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海石一 .
海石一
艺术家笔下的海石一双星系统。
观测资料历元 J2000
星座
船底座
星官
近南极星区 海石
赤经
08h 22m 30.8s
赤纬
−59° 30′ 35″
视星等 (V)
1.86 (~2.17 / ~4.08)
特性 光谱分类 K3 III(K7Ib)/B2 V U−B 色指数 0.19 B−V 色指数 1.20 变星类型 Eclipsing (suspected)
天体测定 径向速度 (Rv ) 2 km/s 自行 (μ) 赤经:−25.34 mas /yr 赤纬:22.72 mas /yr 视差 (π) 5.16 ± 0.49 mas 距离 630 ± 60 ly (190 ± 20 pc ) 绝对星等 (MV ) −4.58
详细资料
质量 10.5/8.2 M ☉ 半径 186/6.2 R ☉ 亮度 11800/~5400 L ☉ 温度 4,030/21,600 K 金属量 ? 自转 ? 年龄 ? 年
其他命名
Avior,
HR 3307,
CD −59°1032,
HD 71129,
SAO 235932, FK5 315,
HIP 41037, GC 11463, CCDM J08225-5931
参考数据库 SIMBAD 资料
海石一 (ε Car / 船底座ε )是船底座 的一颗恒星,视星等 +1.86,是天空中最亮的恒星之一,但在北半球无法看见。
海石一有一个广为人知的、但非经典的名字:Avior,这个名字在20世纪30年代后期由英国航海星历局(HM Nautical Almanac Office)为皇家空军发行的航空星历中命名。在这本包含57个恒星的新航空星历中,有2颗恒星没有经典的命名:海石一(船底座ε)和孔雀座α。但皇家空军坚持所有的恒星必须有专名,因此创造了两个新名称:孔雀座α被命名为孔雀,同时船底座ε被命名为Avior。[1]
海石一是一个双星系统 ,主星是一颗濒临死亡的橙巨星,光谱型K3III,伴星为一颗炽热的蓝矮星,光谱型B2V。两颗星有规则的互相掩食,导致0.1星等的光度变化。
注释
^ Sadler, D.H.: "A Personal History of H.M. Nautical Almanac Office", page 46. Edited and privately published by Wilkins, G.A., 1993
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