大犬座ι
天狼增五(Iota Canis Majoris)的拉丁化源自ι Canis Majoris,孤獨的[12]位在南天星座的大犬座,是一顆超巨星變星。它的視星等在+4.36和+4.40之間變化著[3]。根據視差的測量,這顆恆星與地球相距約3,100光年。它正以+41.2Km/s的徑向速度遠離而去[7]。
觀測資料 曆元 J2000 | |
---|---|
星座 | 大犬座 |
星官 | 天狼 (井宿) |
赤經 | 06h 56m 08.22413s[1] |
赤緯 | −17° 03′ 15.2675″[1] |
視星等(V) | 4.40[2] (4.36 - 4.40[3]) |
特性 | |
光谱分类 | B3Ib[4],或B3Ib/II[5] |
U−B 色指数 | −0.74[6] |
B−V 色指数 | −0.07[6] |
变星类型 | 仙王座β型?[2] |
天体测定 | |
徑向速度 (Rv) | +41.20[7] km/s |
自行 (μ) | 赤经:−3.56 ± 0.17[1] mas/yr 赤纬:+2.42 ±0.20[1] mas/yr |
视差 (π) | 1.04 ± 0.20[1] mas |
距离 | approx. 3,100 ly (approx. 1,000 pc) |
绝对星等 (MV) | −5.51[8] |
詳細資料 | |
質量 | 12.5[9] M☉ |
半徑 | 25.9[8] R☉ |
表面重力 (log g) | 2.60[10] |
亮度 | 47,000[8] L☉ |
溫度 | 17,000[10] K |
金属量 [Fe/H] | −0.17[11] dex |
自轉速度 (v sin i) | ±4 27[10] km/s |
年齡 | 14.8[9] Myr |
其他命名 | |
參考資料庫 | |
SIMBAD | 资料 |
天狼增五是一顆大質量的藍白色B型超巨星,光譜類型為B3Ib[4]。它被歸類為仙王座β型變星[3],但超巨星光譜類型和一個多月的期意味著它不再被認為是這種類型的[2]。這顆恆星的年齡為1,480萬,並正以27Km/s投影旋轉速度自轉[10]。它的質量是太陽的12.5倍[9],半徑是太陽的25.9倍[8]。天狼增五的光度是太陽的47,000倍[8],光球層的有效溫度是17,000K[10]。
參考資料
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