Copyright:Christopher Go
原文:
Telescopic observers on Earth have been treated to spectacular views of Saturn lately as the ringed planet reached its 2015 opposition on May 23 at 0200 UT. Of course opposition means opposite the Sun in Earth’s sky. So near opposition Saturn is up all night, at its closest and brightest for the year. These sharp images taken within hours of the Sun-Earth-Saturn alignment also show the strong brightening of Saturn’s rings known as the opposition surge or the Seeliger Effect. Directly illuminated, the ring’s icy particles cast no shadows and strongly backscatter sunlight toward planet Earth, creating the dramatic surge in brightness. Saturn currently stands in the sky not far from bright Antares, alpha star of the constellation Scorpius.
中文翻譯:
天文愛好者們,最近地球上的望遠鏡觀察者們有幸欣賞到了土星的壯觀景象,因為這顆環行行星在2015年5月23日02:00 UT達到了對沖。對沖的意思是土星在天空中與太陽相對。因此,在對沖期間,土星整晚都在天空中可見,並且是當年最近和最明亮的時刻。這些在太陽-地球-土星對齊幾小時內拍攝的清晰影像顯示了土星環的強烈亮度增強,這被稱為對沖激增效應(Seeliger Effect)。當直接照明時,環中的冰粒子不會投下陰影,並強烈地朝向地球反向散射陽光,造成驚人的亮度激增。現在,土星在天空中的位置不遠於明亮的心宿二(Antares),即天蠍座的α星。
#土星 #對沖 #天文 #Seeliger效應 #觀星 #心宿二 #天蠍座 #宇宙奇觀 #星空觀察
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來源:NASA每日圖片