Iapetus

Iapetus is one of Saturn's 62+ moons. The voyage of the Cassini spacecraft has yielded an abundance of information about Saturn and its moons.

伊帕特斯是土星的62多颗卫星之一。卡西尼探测器的旅程为土星及其卫星提供了大量信息。

这张灰度图像显示的是土卫六，来自NASA/JPL/Space Science Institute。

Iapetus shows a brightness variation of a factor of 10, a change in intensity believed to be caused by the existence of ice on one side and black carbonaceous material on the other. ( Weisburd, Science News 133, June 11, 1988 p374)

伊阿佩托斯星表现出亮度变化，变化因子为10，这种强度变化被认为是由其一侧存在冰，而另一侧存在黑色碳质物质所引起。

Iapetus has a diameter of 1,468 kilometers. This two-toned moon was imaged on 10 September 2007 by Cassini. This image shows the complicated transition region between the dark leading and bright trailing hemispheres. The region appears heavily cratered, particularly in the north and south polar regions.

伊阿佩托斯的直径为1,468公里。这张照片是2007年9月10日由卡西尼号拍摄的，显示了暗色的前方半球与明亮的后方半球之间的复杂过渡区域。该区域显得布满陨石坑，特别是在南北极地区。

The most prominent topographic feature in this view, in the bottom half of the mosaic, is a 450-kilometer wide impact basin, one of at least nine such large basins on Iapetus. In many places, the dark material - thought to be composed of nitrogen-bearing organic compounds called cyanides, hydrated minerals and other carbonaceous minerals - appears to coat equator-facing slopes and crater floors. The distribution of this material and variations in the color of the bright material across the trailing hemisphere will be crucial clues to understanding the origin of Iapetus' peculiar bright-dark dual personality.

在这个视图中，最显著的地形特征位于拼接图的下半部分，是一个宽450公里的撞击盆地，是伊萨尔（Iapetus）上至少九个大型盆地之一。在许多地方，暗色物质——被认为由含氮有机化合物（称为氰化物）、水合矿物和其他碳质矿物组成——似乎覆盖了面向赤道的斜坡和陨石坑底部。这种物质的分布以及后半球明亮物质颜色的差异将是理解伊萨尔奇特明暗双面性格起源的关键线索。