土星中的土卫一
(原标题: Mimas in Saturnlight)
2021-07-30
浏览次数: 28
从阴影中窥视，土卫一面向土星的半球位于接近黑暗的地方，旁边是一个引人注目的阳光月牙。这幅马赛克图是在2017年1月30日卡西尼号航天器最后一次近距离接近时拍摄的。卡西尼号的相机几乎指向太阳方向，距离土卫一只有4.5万公里。其结果是这颗冰冷、坑坑洼洼、直径400公里的卫星的最高分辨率图像之一。增强的版本更好地揭示了同步旋转的月球面向土星的半球，被土星本身反射的阳光照亮。要查看它，请将光标滑动到图像上（或点击此链接）。卡西尼号拍摄的其他土卫一照片还包括这颗小卫星上巨大而不祥的赫歇尔陨石坑。
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Peering from the shadows, the Saturn-facing hemisphere of Mimas lies in near darkness alongside a dramatic sunlit crescent. The mosaic was captured near the Cassini spacecraft's final close approach on January 30, 2017. Cassini's camera was pointed in a nearly sunward direction only 45,000 kilometers from Mimas. The result is one of the highest resolution views of the icy, crater-pocked, 400 kilometer diameter moon. An enhanced version better reveals the Saturn-facing hemisphere of the synchronously rotating moon lit by sunlight reflected from Saturn itself. To see it, slide your cursor over the image (or follow this link). Other Cassini images of Mimas include the small moon's large and ominous Herschel Crater.