Copyright:Hartwig Luethen
原文:
Not once, but twice the International Space Station transits the Sun on consecutive orbits of planet Earth in this video frame composite. The scene was captured on August 22 from a single well-chosen location in Schmalenbeck, Germany where the ISS created intersecting shadow paths only around 7 kilometers wide. Crossing the solar disk in a second or less, the transits themselves were separated in time by about 90 minutes, corresponding to the space station’s orbital period. While the large, flare-producing sunspot group below center, AR 2403, remained a comfortable 150 million kilometers away, the distance between camera and orbiting station was 656 kilometers for its first (upper) transit and 915 kilometers for the second more central transit. In sharp silhouette the ISS is noticeably larger in angular size during the closer, first pass. Of course, tomorrow the Moon will transit the Sun. But even at well-chosen locations, its dark, central shadow just misses the Earth’s surface creating a partial solar eclipse.
中文翻譯:
國際空間站(International Space Station)在8月22日於德國Schmalenbeck的選定位置上,兩次穿越太陽,這一瞬間以畫框合成的方式被捕捉到。這一場景的亮點在於,ISS的影子路徑交錯,寬度僅約7公里。每次穿越太陽的時間不到一秒,兩次的時間間隔約為90分鐘,這與空間站的軌道周期相符。
在畫面下方的中央位置,出現了一個大型、產生耀斑的太陽黑子群AR 2403,距離我們大約150萬公里,而拍攝時,攝影機與空間站的距離分別為656公里(第一次上方的穿越)和915公里(第二次更中央的穿越)。在清晰的輪廓中,ISS在距離較近的第一次穿越中,角度大小明顯更大。
當然,明天月亮(Moon)將會穿越太陽,但即使在精心選擇的地點,它的中央黑影也僅僅掠過地球表面,形成部分日食(partial solar eclipse)。
#國際空間站 #ISS #太陽 #日食 #Schmalenbeck #AR2403 #太陽黑子 #宇宙探索 #天文學 #天文攝影 #太空奇觀 #星際旅行 #天文愛好者
來源:NASA每日圖片