英仙座的英仙座流星群
Perseids from Perseus
來源：Marcin Rosadziński｜發表日期：2025-08-12
這些流星都來自哪裡？ 從天空的方向來看，尖銳的答案是英仙座。 這就是為什麼今晚達到頂峰的流星雨被稱為英仙座流星雨--這些流星似乎都來自英仙座方向的一個輻射體。不過，就母體而言，組成英仙座流星雨的沙粒大小的碎片來自斯威夫特-塔特爾彗星。這顆彗星沿著一條明確的軌道繞太陽執行，軌道中接近地球的部分與英仙座的前方重疊。因此，當地球穿過這一軌道時，墜落碎片的輻射點就會出現在英仙座上。這裡展示的是 2024 年 8 月英仙座流星雨期間拍攝的一張包含 100 多顆流星、歷時六個夜晚的合成圖，圖中顯示了許多劃過波蘭比什卡迪山脈的明亮流星。今年的英仙座流星雨通常是一年中最精彩的流星雨之一，今年的流星雨將與一輪明亮的月亮競爭，在許多地方，月亮將在日落後不久升起。
原文：Where are all of these meteors coming from? In terms of direction on the sky, the pointed answer is the constellation of Perseus. That is why the meteor shower that peaks tonight is known as the Perseids -- the meteors all appear to come from a radiant toward Perseus. In terms of parent body, though, the sand-sized debris that makes up the Perseids meteors come from Comet Swift-Tuttle. The comet follows a well-defined orbit around our Sun, and the part of the orbit that approaches Earth is superposed in front of Perseus. Therefore, when Earth crosses this orbit, the radiant point of falling debris appears in Perseus. Featured here, a composite image taken over six nights and containing over 100 meteors from 2024 August Perseids meteor shower shows many bright meteors that streaked over the Bieszczady Mountains in Poland. This year's Perseids, usually one of the best meteor showers of the year, will compete with a bright moon that will rise, for many locations, soon after sunset.
※ 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。