外屏七

α Piscium
觀測資料
曆元 J2000.0
星座 双鱼座
星官 外屏奎宿
赤經 02h 02m 02.8s
赤緯 +02° 45' 49"
視星等(V) +4.33 + 5.23
距離 139 光年
(42.6 pc)
光譜分類 A0pSiSr + A3m
其他命名
Alrischa, Alrescha, Kaitain, Okda, 113 Psc, HR 596, HD 12447, SAO 110291

外屏七 (α Psc / 双鱼座α) 是双鱼座的一颗恒星,俗名Alrescha (Al Rescha, Alrischa, Alrisha),源于阿拉伯语 الرشآء al-rišā’,意为“井绳”。还有一些不常用的名字如Kaitain 以及Okda,后者源于阿拉伯语عقدة ‘uqdah "绳结"。

外屏七是一个双星系统,由目前相距1.8"的两颗恒星组成。主星视星等为+4.33,光谱型为A0p,伴星视星等为+5.23,光谱型为A3m。二者绕行周期超过700年,到2060年左右它们相距最近。它们中有一颗或者两颗都可能是分光双星。主星和伴星的质量分别为2.3和1.8个太阳质量,总光度分别为31和12倍太阳光度

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