《日出前的火卫二
(原标题: Deimos Before Sunrise)
2025-05-24
浏览次数: 66
火卫二绕这颗红色星球运行一周需要30小时18分钟。这比火星上的一天多一点，也就是24小时40分钟，所以火卫二向西穿过火星的天空。火星两颗卫星中最小的卫星直径最宽约15公里，但它的亮度很高。事实上，火卫二是毅力号在3月1日日出前拍摄的火星天空中最亮的天体，这是该火星探测器任务的第1433个sol。这张照片是由火星车的一个导航相机记录的16张照片组成的。单独的曝光被合并成一张图像，以增强弱光视图。狮子座的明亮恒星——轩辕十四和仙女座，在火星黎明前的黑暗天空中也能看到。
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Deimos takes 30 hours and 18 minutes to complete one orbit around the Red Planet. That's a little more than one Martian day or sol which is about 24 hours and 40 minutes long, so Deimos drifts westward across the Martian sky. About 15 kilometers across at its widest, the smallest of Mars' two moons is bright though. In fact Deimos is the brightest celestial object in this Martian skyscape captured before sunrise by Perseverance on March 1, the 1,433rd sol of the Mars rover's mission. The image is a composed of 16 exposures recorded by one of the rover's navigation cameras. The individual exposures were combined into a single image for an enhanced low light view. Regulus and Algeiba, bright stars in the constellation Leo, are also visible in the dark Martian predawn sky.