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天垒城一

天垒城一
觀測資料
曆元 J2000
星座 宝瓶座
星官 虚宿 天垒城
赤經 21h 37m 45.1093s
赤緯 -07° 51′ 15.125″
視星等(V) 4.69
特性
光谱分类A7V
U−B 色指数0.13
B−V 色指数0.17
天体测定
徑向速度 (Rv)-18 km/s
自行 (μ) 赤经:114.29 mas/yr
赤纬:-24.44 mas/yr
视差 (π)18.26 ± 0.84 mas
距离179 ± 8 ly
(55 ± 3 pc)
绝对星等 (MV)4.859
詳細資料
質量3,1 M
半徑2,1 R
亮度40 L
溫度7,500–10,000 K
金屬量?
自轉0,001892691
年齡?
軌道
伴星ξ Aquarii B
繞行週期 (P)21,9466119 yr
半長軸 (a)0.1"
倾斜角 (i)123°
其他命名
HD 205767, 2MASS J21374510-0751150, ksi Aqr, GSC 05787-01291, N30 4769, TD1 28291, 23 Aqr, HERZ 16090, PLX 5208, TYC 5787-1291-1, MCA 68, PMC 90-93 1110, UBV M 25820, BD-08° 5701, HIP 106786, PPM 205412, UBV 18581, FK5 1569, HR 8264, ROT 3141, uvby98 100205767, GC 30268, IRAS 21350-0804, SAO 145537, YZ 98 7765, GCRV 13580, JP11 3371, SBC7 864.
參考資料庫
SIMBAD资料

天垒城一(英語:ξ Aqr / ξ Aquarii)是宝瓶座的一颗恒星,距离地球约179光年,英文名為Bunda

它的光谱型为A7V,视星等+4.68。这是一个分光双星系统,绕行周期为8016天。

天垒城一和虚宿一(宝瓶座β)、天壘城二(摩羯座46)一起被称为Saʽd al Suʽud,这个名字来自于阿拉伯语سعد السعود, 意思为“幸中之幸”。[1][2]

参考资料

  1. ^ Allen, R. H. Star Names: Their Lore and Meaning Reprint. New York: Dover Publications Inc. 1963: 52 [2010-12-12]. ISBN 0486210790. (原始内容存档于2023-07-28). 
  2. ^ 其中虚宿一称为Nir Saad al SaaoudLucida Fortunæ Fortunarum,意思为最亮的幸中之幸恒星;天壘城一称为Thanih Saad al SaaoudSecunda Fortunæ Fortunarum,意思为第二亮的幸中之幸恒星;天壘城二本来应该称为Thalath Fortunæ FortunarumTertia Fortunæ Fortunarum,意思为第三亮的幸中之幸恒星,但Al Achsasi Al Mouakket并没有为这颗恒星命名,原因不明。

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