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Perihelion Approaches

Perihelion Approaches
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原文:
This dramatic outburst from the nucleus of Comet 67P/Churyumov-Gerasimenko occured on August 12, just hours before perihelion, its closest approach to the Sun. Completing an orbit of the Sun once every 6.45 years, perihelion distance for this periodic comet is about 1.3 astronomical units (AU), still outside the orbit of planet Earth (at 1 AU). The stark image of the 4 kilometer wide, double-lobed nucleus in bright sunlight and dark shadows was taken by the Rosetta spacecraft’s science camera about 325 kilometers away. Too close to see the comet’s growing tail, Rosetta maintains its ringside seat to watch the nucleus warm and become more active in coming weeks, as primordial ices sublimating from the surface produce jets of gas and dust. Of course, dust from the nucleus of periodic comet Swift-Tuttle, whose last perihelion passage was in 1992 at a distance of 0.96 AU, fell to Earth just this week.
中文翻譯:
呢個劇烈爆發係67P/楚留莫夫-赫拉西門科彗星的核心於8月12日發生,就喺近日最接近太陽的近日點。呢個每6.45年繞太陽轉一圈的週期性彗星,近日點距離約為1.3個天文單位(AU),仍然在地球軌道(1 AU)之外。呢幅清晰的圖片顯示了直徑約4公里的雙瓣核,在明亮的陽光和陰影之中拍攝,是由羅塞塔太空船的科學相機在大約325公里的距離拍攝的。因為距離太近,所以無法看到彗星逐漸增長的尾巴,羅塞塔卻能夠近距離觀察核心隨著溫度上升而變得更加活躍,未來幾週,發源於原始冰的氣體和灰塵將由表面升華而產生噴射。當然,就在這週,來自於周期彗星Swift-Tuttle的灰塵落到了地球,Swift-Tuttle於1992年最近一次接近太陽,距離為0.96 AU。

#67P #彗星 #羅塞塔 #近日點 #太陽 #天文 #科學 #探索 #灰塵 #太空船 #宇宙探索

來源:NASA每日圖片

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