天桴四

天桴四（天鷹座η）

天鷹座η
觀測資料
曆元 J2000
星座 天鷹座
星官 天桴 (牛宿)
赤經 19h 52m 28.3679s
赤緯 +01° 00′ 20.378″
視星等（V） 3.88
特性
光谱分类F6Iab
U−B 色指数0.51
B−V 色指数0.89
R−I 色指数0.47
变星类型造父變星
天体测定
徑向速度 (Rv)-14.8 km/s
自行 (μ) 赤经：6.94 mas/yr
赤纬：-7.3 mas/yr
视差 (π)2.78 ± 0.91 mas
距离approx. 1,200 ly
(approx. 400 pc)
绝对星等 (MV)-3.90
詳細資料
質量7 M☉
半徑60 R☉
亮度3,400 L☉
溫度5,300–6,200 K
金屬量?
自轉0,01964857221 Year
年齡? 年
其他命名
Bazak, 55 Aquilae, HR 7570,
HD 187929, BD+00°4337,
FK5 746, HIP 97804,
SAO 125159, GC 27517, UBV 21297.
參考資料庫
SIMBAD资料
资料来源：
依巴谷星表、CCDM (2002)、亮星星表

天鷹座η (η Aql / η Aquilae)是在天鷹座的一顆恆星，中国星名天桴四，属牛宿，星官天桴。在過去，它曾經是安迪努斯座(已廢棄的星座)的成員。另一方面，這顆恆星在希伯來很罕見的被稱為Bezek或Bazak，意思是"閃電"。

這是一顆造父變星，視星等以7.176641天在3.6 至 4.4等之間變化。與仙王座δ、雙子座ζ和天龍座β，都是 肉眼可見的造父變星，也就是說，這些恆星不僅肉眼可見，而且變光的範圍也是肉眼可以察覺出的。其他的一些造父變星，像是北極星，雖然夠亮但是光度的變化很小。

它與地球的距離大約1200光年，是一顆黃-白色的超巨星，發光度大約是太陽的3000倍，直徑是太陽的60倍。

位置

這顆恆星在星座內的位置顯是在下面的圖中：

參考資料


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