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毕宿三

毕宿三(金牛座δ¹)
δ¹ Tauri
觀測資料
曆元 J2000.0
星座 金牛座
星官 毕宿
赤經 04h 22m 56.1s
赤緯 +17° 32' 33"
視星等(V) +3.77
距離 153 ± 7 光年
(47 ± 2 pc)
光譜分類 K0-IIICN0.5
其他命名
Hyadum II, 61 Tauri, HR 1373,
HD 27697, BD+17 712,
FK5 162, HIP 20455, SAO 93897,
GC 5304, CCDM 04229+1733

毕宿三,即金牛座δ¹(δ¹ Tau,δ¹ Tauri)是一颗位于金牛座三合星系统,它是离太阳系最近的疏散星团——毕宿星团的成员之一,距离地球约153光年。由于毕宿三的位置接近黄道,故经常被月球所遮掩。此外,太阳系行星水星金星等也有可能遮掩它,但这现象非常罕见。上一次发生金星掩毕宿三是在1818年1月3日。

毕宿三的主星毕宿三A是一颗橙色K-型巨星,是毕宿星团六颗巨星中的一颗,视星等为+3.77。毕宿三A的亮度是太阳的74倍,半径是太阳的11.6倍,质量是太阳的2.6倍。表面温度是4965K。它的伴星毕宿三B亮度12等,距离主星107角秒。它可能和主星没有任何物理联系。但是,通过对月掩毕宿三的观测,天文学家发现一颗更近的伴星毕宿三C,距离主星的平均距离是1.76AU,围绕主星旋转的时间为530天。

中国古代星官系统中,毕宿三属于西方白虎七宿毕宿第三星,这也是毕宿三名字的来由[1][2]。它的西方传统名字为Hyadum II,意思为毕宿星团第二亮星。

参考资料

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  1. ^ 香港太空館 - 研究資源 - 亮星中英對照表 互联网档案馆存檔,存档日期2010-08-11., Hong Kong Space Museum. Accessed on line November 23, 2010.
  2. ^ 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 9789867332257.

外部链接

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毕宿三
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