美国国家航空航天局NASA每日一图(天文)-2017年7月6日

2017 July 6

Atlas, Daphnis, and Pan
Image Credit: Cassini Imaging Team, SSI, JPL, ESA, NASA
Explanation: Atlas, Daphnis, and Pan are small, inner, ring moons of Saturn, shown at the same scale in this montage of images from the still Saturn-orbiting Cassini spacecraft. In fact, Daphnis was discovered in Cassini images from 2005. Atlas and Pan were first sighted in images from the Voyager 1 and 2 spacecraft. Flying saucer-shaped Atlas orbits near the outer edge of Saturn's bright A Ring while Daphnis orbits inside the A Ring's narrow Keeler Gap and Pan within the A Ring's larger Encke Gap. The curious equatorial ridges of the small ring moons could be built up by the accumulation of ring material over time. Even diminutive Daphnis makes waves in the ring material as it glides along the edge of the Keeler Gap.

2017年7月6日

阿特拉斯,达佛尼斯,潘
图片来源:卡西尼成像小组,SSI,喷气推进实验室,ESA,美国
说明:阿特拉斯、达夫尼、潘小,内,土星环卫星,显示在相同的规模在这张图像从还是土星探测器卡西尼号。事实上,达夫尼被发现在卡西尼号拍摄的图像从2005。阿特拉斯和潘首次从旅行者1号和2号飞船的图像中看到。飞碟形的轨道附近的阿特拉斯萨图恩的亮环的外缘而达佛涅斯轨道环的窄基勒间隙和锅里在一个环的大环缝。随着时间的推移,环状物质的积累会形成小环形卫星奇特的赤道脊。即使是身材矮小的达夫尼使波在环材料时在基勒隙边缘。

评论已关闭