美国国家航空航天局NASA每日一图-2017年7月27日(在地平线上的阴霾)

Haze on the Horizon

This false-color view from NASA's Cassini spacecraft gazes toward the rings beyond Saturn's sunlit horizon. Along the limb (the planet's edge) at left can be seen a thin, detached haze. This haze vanishes toward the right side of the scene.

Cassini will pass through Saturn's upper atmosphere during the final five orbits of the mission, before making a fateful plunge into Saturn on Sept. 15, 2017. The region through which the spacecraft will fly on those last orbits is well above the haze seen here, which is in Saturn's stratosphere. In fact, even when Cassini plunges toward Saturn to meet its fate, contact with the spacecraft is expected to be lost before it reaches the depth of this haze.

This view is a false-color composite made using images taken in red, green and ultraviolet spectral filters. The images were obtained using the Cassini spacecraft narrow-angle camera on July 16, 2017, at a distance of about 777,000 miles (1.25 million kilometers) from Saturn. Image scale is about 4 miles (7 kilometers) per pixel on Saturn.

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 Caltech 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.

For more information about the Cassini-Huygens mission visit NASA and  The Cassini imaging team homepage.

Image credit: NASA/JPL-Caltech/Space Science Institute

Last Updated: July 28, 2017
Editor: Tony Greicius

在地平线上的阴霾

来自美国宇航局卡西尼号航天器的这种假色视图注视着超越土星阳光明媚的地平线。沿着左边的四肢(行星的边缘)可以看到一个薄薄的,分离的阴霾。这个阴霾消失在现场的右侧。

卡西尼将于2017年9月15日在土星进入土星之前,在任务的最后五个轨道中通过土星的高层气氛。航天器将在最后一个轨道上飞行的地区远远高于这里所看到的阴霾,这是在土星的平流层。事实上,即使卡西尼陷入土星来迎接它的命运,与宇宙飞船的接触预计在这个阴霾的深度之前就会消失。

该视图是使用红色,绿色和紫外光谱滤光片拍摄的图像制作的假色复合材料。这些图像是在2017年7月16日使用卡西尼航天器窄角相机拍摄的,距离土星约777,000英里(125万公里)。图像尺度在土星上每像素约4英里(7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。喷气推进实验室是帕萨迪纳省加州理工学院的一个部门,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在JPL设计,开发和组装。成像操作中心位于科罗拉多州博尔德的空间科学研究所。

有关Cassini-Huygens任务的更多信息,请访问NASA英文官网和卡西尼影像小组。

图片来源:NASA / JPL-Caltech /空间科学研究所

最后更新:2017年7月28日
编者:Tony Greicius

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