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This page describes an image 獵戶座星圖

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Diagram caption: 獵戶座及其明亮的恆星和周圍的星座。獵戶座被金牛座、波江座、天兔座、麒麟座和雙子座環繞(從上往下順時針依次排列)。獵戶座最亮的恆星參宿四和參宿七分別位於星座的北端(圖中上部)和南端(圖中下部),中間是著名的三星 "腰帶"。

獵戶座橫跨天赤道,因此在一年中的某些時候,從地球上的任何地方都能看到它。在世界上最北極或最南極地區,可能看不到獵戶座的某些部分。獵戶座在北半球冬季和南半球夏季的晚上最為明顯。獵戶座上方的藍線標誌著黃道,即太陽在一年中劃過天空的軌跡。太陽從不經過獵戶座,但人們偶爾會在獵戶座發現太陽系的其他行星和月球。

在獵戶座腰帶的正南方,有兩個梅西葉天體M42(獵戶座星雲)和M43,用綠色方框標出。這些星雲和M78(腰帶左邊的綠色方框)是巨大的獵戶座分子雲團的一部分。它覆蓋了獵戶座的大部分區域,包括這些分子雲正在坍縮形成新星的區域。

該圖的 y 軸表示赤緯,單位為度數,以北為上,x 軸表示赤經,單位為小時,以東為左。這裡標注的恆星大小與恆星的視星等有關,視星等是衡量恆星視亮度的標準。較大的點代表較亮的恆星。希臘字母表示星座中的亮星。這些恆星按亮度排序,最亮的恆星被標記為α星,第二亮的為β星,等等,不過並不總是完全遵循這種排序。圍繞著參宿四的圓圈表示它是一顆變星。虛線是國際天文學聯合會劃定的星座邊界,綠色實線是表示星座的常用形式之一。星座邊界和連接恆星的線條都不會出現在實際天空中。


Diagram credit: 由國際天文學聯合會天文教育辦公室根據國際天文學聯合會/《天空與望遠鏡》的原文改編. Credit Link

Diagram translation status: Not yet approved by a reviewer
Diagram translators: An automated transliteration from the simplified Chinese translation by - Hu Xueying
Diagram license: Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons

Related glossary terms: 天球坐標 , 星座 , 獵戶座 , 視星等 , 變星 , 赤經(RA) , 赤緯 , 金牛座 , 雙子座 , 黃道
Categories: Naked Eye Astronomy

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