Copyright:
John Chumack
原文:
Is this coat hanger a star cluster or an asterism? This cosmic hang-up has been debated over much of last century, as astronomers wondered whether this binocular-visible object is really a physically associated open cluster or a chance projection. Chance star projections are known as asterisms, an example of which is the popular Big Dipper. Recent precise measurements from different vantage points in the Earth’s orbit around the Sun have uncovered discrepant angular shifts indicating that the Coat Hanger is better described as an asterism. Known more formally as Collinder 399, this bright stellar grouping is wider than the full moon and lies in the constellation of the Fox (Vulpecula). APOD is also available in: Arabic, Bahasa Indonesian, Catalan, Chinese, Chinese, Czech, Dutch, Farsi, Farsi, Galego, German, French, Hebrew, Japanese, Korean, Montenegrin, Polish, Russian, Serbian, Slovenian, Spanish, Thai, or Turkish
中文翻譯:
這個衣架星團是星團還是星群呢？這個宇宙之困擾在上世紀期間已經引起了天文學家的辯論，他們一直在思考這個可用雙筒望遠鏡觀賞的物體是否真的是一個物理上相關的開放星團，還是一個偶然重疊的星群。偶然重疊的星群被稱為星群，像是著名的大勺子（Big Dipper）。最近，來自地球圍繞太陽不同視角的精確測量揭示出不一致的角位移，表明衣架星團更適合被描述為星群。更正式地說，它被稱為科林德399（Collinder 399），這個明亮的星星組合比滿月還要寬，位於狐狸座（Vulpecula）內。
#衣架星群 #Collinder399 #星空觀賞 #天文學 #狐狸座 #星群 #宇宙探險 #星星 #天文觀測 #APOD #星空
你可以參考以上內容進行 Facebook 和 Instagram 發佈！
來源:NASA每日圖片
