NASA’s Perseverance rover captured this view of Deimos, the smaller of Mars’ two moons, shining in the sky at 4:27 a.m. local time on March 1, 2025, the 1,433rd Martian day, or sol, of the mission. In the dark before dawn, the rover’s left navigation camera used its maximum long-exposure time of 3.28 seconds for each of 16 individual shots, all of which were combined onboard the camera into a single image that was later sent to Earth. In total, the image represents an exposure time of about 52 seconds.
The low light and long exposures add digital noise, making the image hazy. Many of the white specks seen in the sky are likely noise; some may be cosmic rays. Two of the brighter white specks are Regulus and Algieba, stars that are part of the constellation Leo.
Image credit: NASA/JPL-Caltech
美国国家航空航天局（NASA）的毅力号火星车于2025年3月1日，当地时间凌晨4:27，在火星任务的第1,433个火星日（Sol）拍摄到这张影像，画面中显示了火星的两颗卫星之一、较小的火卫二（Deimos）在夜空中闪耀。在黎明前的黑暗中，探测车的左侧导航相机利用最长曝光时间——每张3.28秒——拍摄了16张单独图像，并在相机内部将其合成为一张图像，随后传送回地球。整张图像的总曝光时间约为52秒。
由于光线微弱且采用长时间曝光，图像中出现了数字噪点，使整体画面显得朦胧。天空中可见的许多白色斑点很可能是噪点，也可能是宇宙射线。其中两颗较亮的白点是狮子座中的恒星——轩辕十四（Regulus）和轩辕十二（Algieba）。
图片来源: NASA/JPL-Caltech
