土星对日
(原标题: Saturn Opposite the Sun)
2025-09-25
浏览次数: 1496
今年9月21日，土星对日，在地球的天空中对太阳。在离地球最近的时候，土星也是一年中最亮的时候，它在太阳落山时升起，整个晚上都在地平线上与双鱼座中较暗的恒星一起发光。在这张来自中国西南部青藏高原青海冷湖天文台的快照中，外行星沉浸在一种微弱的、漫射的椭圆形光中，这种光被称为gegenschein或逆光。这种漫射光是由于太阳光被太阳系黄道面上的行星际尘埃反向散射而产生的，而黄道面在地球的天空中与太阳相对。就像一只巨大的眼睛，在这个漆黑的夜晚，土星和gegenschein似乎从反太阳的角度凝视着天文台的望远镜圆顶。强烈的大气气辉沿着地平线形成了色彩斑斓的背景。
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This year Saturn was at opposition on September 21, opposite the Sun in planet Earth's sky. At its closest to Earth, Saturn was also at its brightest of the year, rising as the Sun set and shining above the horizon all night long among the fainter stars of the constellation Pisces. In this snapshot from the Qinghai Lenghu Observatory, Tibetan Plateau, southwestern China, the outer planet is immersed in a faint, diffuse oval of light known as the gegenschein or counter glow. The diffuse gegenschein is produced by sunlight backscattered by interplanetary dust along the Solar System's ecliptic plane, opposite the Sun in planet Earth's sky. Like a giant eye, on this dark night Saturn and gegenschein seem to stare down on the observatory's telescope domes from their antisolar perspective. Strong atmospheric airglow forms a colorful background along the horizon.
© Jin Wang