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金牛座θ

毕宿六(金牛座θ¹)
θ¹ Tauri
觀測資料
曆元 J2000.0
星座 金牛座
星官 毕宿
赤經 04h 28m 34.5s
赤緯 +15° 57' 44"
視星等(V) +3.84
距離 153 ± 8 光年
(47 ± 3 pc)
光譜分類 K0IIIbFe-0.5
其他命名
77 Tau, HR 1411,
HD 28307, BD+15 631,
HIP 20885, SAO 93955,
GC 5433, BDS  2212,
CCDM 04286+1554
毕宿增十三(金牛座θ²)
θ² Tauri
觀測資料
曆元 J2000.0
星座 金牛座
星官 毕宿
赤經 04h 28m 39.7s
赤緯 +15° 52' 15"
視星等(V) +3.40
距離 155 ± 8 光年
(47 ± 3 pc)
光譜分類 A7III
其他命名
Phaesula, 78 Tau, HR 1412,
HD 28319, BD+15 632,
HIP 20894, SAO 93957,
GC 5436, BDS  2212,
CCDM 04286+1554

金牛座θ(θ Tau,θ Tauri)是一个位于金牛座恒星系统,由3等星金牛座θ¹和金牛座θ²组成。它们距离地球约155光年,是离太阳系最近的疏散星团——毕宿星团的成员之一。

金牛座θ¹和金牛座θ²在天球上的距离为5.62角分(0.094°)。其中金牛座θ¹相对比较昏暗,是一颗K型的橘色巨星视星等为+3.84。金牛座θ²是一颗白色A型巨星,平均视星等为+3.40。金牛座θ²也是一颗盾牌座δ型变星,它的亮度在+3.35至+3.42之间变化,光变周期为1小时48分55.3秒。

金牛座θ¹和金牛座θ²同时又都是分光双星,各拥有至少一颗伴星。金牛座θ¹的伴星视星等7等,距离 金牛座θ¹0.082角秒(4AU),金牛座θ²的伴星视星等6等,距离 金牛座θ²0.005角秒(2AU),旋转周期为141天。

中国古代星官系统中,金牛座θ属于西方白虎七宿毕宿第六星,因此将其称为毕宿六。但随着西方天文知识的传入,中国人认识到金牛座θ是由金牛座θ¹和金牛座θ²组成。在清朝对星官系统进行补充时,金牛座θ¹继续保留毕宿六的名字,而金牛座θ²则被命名为毕宿增十三。但现在依然可以使用毕宿六指代整个金牛座θ恒星系统。

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金牛座θ
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