Three tenuous rings/arcs for three tiny moons

Three tenuous rings/arcs for three tiny moons
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三个细小的环/弧代表三个小卫星

DOI:
10.1016/j.icarus.2008.11.001
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发表时间:
2009
期刊:
影响因子:
3.2
通讯作者:
Hedman M
Hedman M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hedman M

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使用卡西尼号图像,我们检查了沿着 Methone、Anthe 和 Pallene 轨道的微弱物质,这三颗小卫星位于土卫二和土卫二的轨道之间。一个连续的材料环覆盖了帕伦星的轨道;它在极高的相位角下可见,并且似乎垂直定位在帕伦倾斜轨道±25公里范围内。相比之下,与 Anthe 和 Methone 相关的物质似乎位于纵向限制的弧内。 Methone 弧在卫星位置周围延伸超过 10° 的经度,而 Anthe 弧的长度达到 ∼20°。这些弧的范围与附近与土卫一的共转偏心率共振的限制一致。考虑到月球的预测天平动,安西甚至被观察到相对于其弧线的经度以预期的方式发生变化。
Using Cassini images, we examine the faint material along the orbits of Methone, Anthe and Pallene, three small moons that reside between the orbits of Mimas and Enceladus. A continuous ring of material covers the orbit of Pallene; it is visible at extremely high phase angles and appears to be localized vertically to within ±25 km of Pallene's inclined orbit. By contrast, the material associated with Anthe and Methone appears to lie in longitudinally confined arcs. The Methone arc extends over ∼10° in longitude around the satellite's position, while the Anthe arc reaches ∼20° in length. The extents of these arcs are consistent with their confinement by nearby corotation eccentricity resonances with Mimas. Anthe has even been observed to shift in longitude relative to its arc in the expected manner given the predicted librations of the moon.
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