美国国家航空航天局NASA每日一图-2017年7月10日

Dawn’s Early Light

The light of a new day on Saturn illuminates the planet’s wavy cloud patterns and the smooth arcs of the vast rings.

The light has traveled around 80 minutes since it left the sun's surface by the time it reaches Saturn. The illumination it provides is feeble; Earth gets 100 times the intensity since it's roughly ten times closer to the sun. Yet compared to the deep blackness of space, everything at Saturn still shines bright in the sunlight, be it direct or reflected.

This view looks toward the sunlit side of the rings from about 10 degrees above the ring plane. The image was taken with the Cassini spacecraft wide-angle camera on Feb. 25, 2017 using a spectral filter which preferentially admits wavelengths of near-infrared light centered at 939 nanometers.

The view was obtained at a distance of approximately 762,000 miles (1.23 million kilometers) from Saturn. Image scale is 45 miles (73 kilometers) per pixel.

The Cassini mission is a cooperative project of NASA, ESA (the European Space Agency) and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA's Science Mission Directorate, Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colorado.
Credit: NASA/JPL-Caltech/Space Science Institute
Last Updated: July 10, 2017
Editor: Martin Perez

 

黎明的晨光

土星新的一天的光芒照亮了地球的波浪云图和巨大的圆环的光滑弧。

光线从达到土星的时候离开了太阳的表面,已经走了大约80分钟。它提供的照明是微弱的;地球距离太阳的距离大约是十倍。然而,与深空的空间相比,土星上的一切在阳光下仍然亮光,无论是直接还是反射。

这个视图从环平面上方约10度看向环的阳光照射的一侧。 2017年2月25日,使用卡西尼航天器广角摄像机拍摄图像,使用光谱滤波器,其优先承认以939纳米为中心的近红外光的波长。

该景观距离土星约762,000英里(123万公里)。图像尺度为每像素45英里(73公里)。

卡西尼任务是美国宇航局,欧空局(欧空局)和意大利航天局的合作项目。喷气推进实验室,加利福尼亚理工学院在帕萨迪纳的一个部门负责管理美国宇航局科学任务总局华盛顿的任务。卡西尼轨道器及其两个车载摄像机是在JPL设计,开发和组装的。成像作业中心位于科罗拉多州博尔德的空间科学研究所。

有关Cassini-Huygens特派团的更多信息,请访问http://saturn.jpl.nasa.gov和http://www.nasa.gov/cassini。卡西尼影像小组主页是http://ciclops.org。
版权:NASA / JPL-Caltech /空间科学研究所
最后更新:2017年7月10日
编辑:Martin Perez

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