五車五 (來自拉丁化的名稱為"βeta Tauri",縮寫為"Beta Tau"或"β Tau"),正式名稱為Elnath[10](發音為/ɛlnæθ/或/ˈɛlnæθ/)[11],為金牛座第二亮星,視星等為1,65等。它距離地球134光年,是一顆化學性質特殊的B7巨星。
這顆恆星因為位於金牛座與御夫座的邊界,所以在拜耳命名法中曾有兩個名稱:金牛座β(拉丁化為Beta Tauri)和御夫座γ (拉丁化為Gamma Aurigae)。托勒密認為這顆恆星由御夫座和金牛座共用,所以約翰·拜耳在兩個星座中都為它指定了一個名稱。當現代星座邊界在1930年被確定時,御夫座γ的名稱基本上已不再使用[12]。
傳統名稱"Elnath",與"El Nath"或"Alnath"不同,它來自阿拉伯語單詞"النطح""an-naţħ",意思是「對接」(即公牛的角)。與許多其他阿拉伯星名一樣,文字"ال"字面上音譯為"el",但在阿拉伯語發音中,它絕大多數被同化為"n",這意味著它被省略了。2016年,國際天文學聯合會組織了IAU恆星名稱工作組(WGSN)[13]對恆星的專有名稱進行編目和標準化。WGSN在2016年7月發佈的第一份公告[14]包括WGSN批准的前兩批名稱的表格;其中確認這顆恆星專屬的名稱為"Elnath"。
在中國,五車(Wǔ Chē)的意思為「五輛戰車」,指由金牛座β、御夫座ι、御夫座α、御夫座β和御夫座θ組成的星官[15]。因此,金牛座β的中國名稱是五車五 (Wǔ Chē Wǔ;英語:Fifth of the Five Chariots。)[16]。
五車五的絕對星等是-1.34,類似金牛座的另一顆恆星,在疏散星團昴宿星團中的昴宿四。與昴宿四相同,五車五是一顆B型的巨星,光度為太陽的700倍(L☉)[9]。它已經演化成比在主序帶時更大、但溫度更低的巨星 [17]。然而,與昴宿四360年的距離比較,五車五的距離只有130光年,是金牛座第二亮的恆星。
它是一顆汞-錳星,一種化學性質奇特的非磁性恆星,其光譜的特徵顯示一些重元素的量異常的多[8]。相較於太陽,五車五以富含錳,但鈣和鎂的量很少而聞名[9][18]。然而,缺乏強烈的汞特徵,加上矽和鉻的含量特別高,導致一些學者給出了其它分類,包括做為"SrCrEu星"甚至Ap星[19][20]。它的邊緣變暗角直徑測量值為6991528446912409395♠1.090±0.076 mas。在7018126821348598301♠41.1 pc的距離處,這對應於7000482000000000000♠4.82±0.34 太陽半徑的線性半徑[21]
位於銀河系窄平面的南緣在反銀心以西幾度處,五車五β成為許多銀河南側星雲和星團的前景天體,例如M36、M37和M38[22]。它位於黃道以北5.39度,足以被月球遮蔽,但發生的機率並不高。當月球的升交點靠近春分點時,才會發生這種掩星;例如2007年。因為五車五位於月球掩星區的北部邊緣,所以大多數只在南半球可見。當年發生14次,台灣地區僅能見9月4日晚間發生的那一次,南加利福尼亞可以看見8月8日的那一次[23]。
從我們的角度來看,五車五有一顆微弱的恆星在非常接近的角距離上。天文學家在觀測指南上提到這是一對雙星。可見的伴星BD + 28°795B在位置角239度之處,距離僅33.4角秒(")[24][25]。在尋找棕矮星和行星伴星時,已經發現六顆角度更近,甚至更暗淡的恆星 – 這些恆星都被認為是背景天體[26]。
在月球掩星的測量中報告了一個非常接近的同伴:6993484813681109537♠0.1″,但未得到其他觀察者的證實。徑向速度測量表明,五車五是單線光譜聯星,但沒有關於伴星或軌道的公開資訊[27][21]。
天球赤道座標: 05h 26m 17.5134s,+28° 36′ 27.494″
لمعانٍ أخرى، طالع يونيون (توضيح). يونيون علم الإحداثيات 38°56′43″N 84°40′19″W / 38.9453°N 84.6719°W / 38.9453; -84.6719 تاريخ التأسيس 1838 تقسيم إداري البلد الولايات المتحدة[1][2] التقسيم الأعلى مقاطعة بوون خصائص جغرافية المساحة 8.64333 كيلومتر…
Chronologies Chronologie Disney 2005 2006 2007 2008 2009 2010 2011Décennies :1970 1980 1990 2000 2010 2020 2030 Actualités de l'année Chronologie dans le monde 2005 2006 2007 2008 2009 2010 2011Décennies :1970 1980 1990 2000 2010 2020 2030Siècles :XIXe XXe XXIe XXIIe XXIIIeMillénaires :Ier IIe IIIe Chronologies géographiques Afrique Afrique du Sud, Algérie, Angola, Bénin, Botswana, Burkina …
يفتقر محتوى هذه المقالة إلى الاستشهاد بمصادر. فضلاً، ساهم في تطوير هذه المقالة من خلال إضافة مصادر موثوق بها. أي معلومات غير موثقة يمكن التشكيك بها وإزالتها. (ديسمبر 2018) لأماكن أخرى بنفس الاسم، انظر الحضن (توضيح). الربوع - قرية - تقسيم إداري البلد اليمن المحافظة
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