大拉克塔星雲
The Great Lacerta Nebula
來源：Ian Moehring & Kevin Roylance｜發表日期：2025-09-10
它是天空中最大的星雲之一--為什麼它不為人知呢？大漆樹星雲的角度大小與仙女座星系差不多，位於蜥蜴座（Lacerta）方向。這個發射星雲很難用廣角雙筒望遠鏡看到，因為它非常暗淡，而且通常也很難用大型望遠鏡看到，因為它的角度非常大--跨度大約有 3 度。這個星雲的深度、廣度、波浪和美感（編入星表的是 Sharpless 126 (Sh 2 - 126 ) 星雲），最好用相機長時間曝光才能看到和欣賞到。這張照片就是這樣的一次綜合曝光-- 8 月份在美國華盛頓州摩西湖（Moses Lake）的黑暗天空中拍攝了三個夜晚。大拉塞爾塔星雲中的氫氣發出紅色光芒，這是因為它受到了來自明亮恆星 10 Lacertae 的光的激發， 10 Lacertae 是明亮的藍色恆星之一，就在發出紅光的星雲中心左側。 大部分恆星和星雲距離我們大約 1200 光年。 拼圖宇宙每日天文拼圖
原文：It is one of the largest nebulas on the sky -- why isn't it better known? Roughly the same angular size as the Andromeda Galaxy, the Great Lacerta Nebula can be found toward the constellation of the Lizard (Lacerta). The emission nebula is difficult to see with wide-field binoculars because it is so faint, but also usually difficult to see with a large telescope because it is so great in angle -- spanning about three degrees. The depth, breadth, waves, and beauty of the nebula -- cataloged as Sharpless 126 (Sh2-126) -- can best be seen and appreciated with a long duration camera exposure. The featured image is one such combined exposure -- in this case taken over three nights in August through dark skies in Moses Lake, Washington, USA. The hydrogen gas in the Great Lacerta Nebula glows red because it is excited by light from the bright star 10 Lacertae, one of the bright blue stars just to the left of the red-glowing nebula's center. Most of the stars and nebula are about 1,200 light years distant. Jigsaw Universe: Astronomy Puzzle of the Day
※ 本文由萌芽機器人自動轉貼自每日一天文圖（Astronomy Picture of the Day，APOD），原文為英文，正體中文是透過 DeepL 翻譯及 OpenCC 進行自動處理，內容僅供參考，若有任何錯誤之處還請見諒！
關於每日一天文圖：每日一天文圖網站是美國國家航空暨太空總署與密西根理工大學提供的服務，網站每天提供一張影像或圖片，並由天文學家撰寫扼要說明其特別之處。