DETECTION OF LOW-VELOCITY COLLISIONS IN SATURN'S F RING
DETECTION OF LOW-VELOCITY COLLISIONS IN SATURN'S F RING
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土星 F 环中低速碰撞的检测
DOI：
10.1088/2041-8205/755/2/l27
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Attree N
中科院分区：
文献类型：
--
作者：
Attree N
从土星F环延伸出数百公里的物质喷流被认为是由直径约10公里的物体（如S/2004 S 6）与环核心之间以数十ms− 1的速度碰撞造成的。随后的开普勒剪切效应导致了F环的多股性质。卡西尼号航天器上的成像科学子系统实验对环的观测提供了证据，表明环核心的一些较小的突起是与附近物体低速碰撞的结果。我们将这些突出物称为“迷你喷流”，其中一个特征已经观察了107.5小时，其长度从1075公里变为10250公里，同时似乎塌陷到核心。轨道测定表明，这样的小型喷流是由与附近小卫星发生0.1ms − 1碰撞而移位的环物质组成的，导致相对于核心的路径是由于开普勒剪切和周转运动的组合。卡西尼号图像中的微型喷流的探测表明，现在有可能理解大多数小规模的F环结构是这种碰撞的结果。因此，对这些微型喷流的研究将限制碰撞群体的性质，并提高我们对冰冷物体之间低速碰撞的理解。
Jets of material extending several hundred kilometers from Saturn's F ring are thought to be caused by collisions at speeds of several tens of ms− 1 between∼ 10 km diameter objects such as S/2004 S 6 and the core of the ring. The subsequent effects of Keplerian shear give rise to the multi-stranded nature of the F ring. Observations of the ring by the Imaging Science Subsystem experiment on the Cassini spacecraft have provided evidence that some smaller protrusions from the ring's core are the result of low-velocity collisions with nearby objects. We refer to these protrusions as" mini-jets" and one such feature has been observed for∼ 7.5 hr as its length changed from∼ 75 km to∼ 250 km while it simultaneously appeared to collapse into the core. Orbit determinations suggest that such mini-jets consist of ring material displaced by a∼ 1 ms− 1 collision with a nearby moonlet, resulting in paths relative to the core that are due to a combination of Keplerian shear and epicyclic motion. Detections of mini-jets in the Cassini images suggest that it may now be possible to understand most small-scale F ring structure as the result of such collisions. A study of these mini-jets will therefore put constraints on the properties of the colliding population as well as improve our understanding of low-velocity collisions between icy objects.
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DOI：
10.1088/0004-6256/145/6/161
发表时间：
2013
期刊：
The Astronomical Journal
影响因子：
--
作者：
N. Cooper;Carl D. Murray;G. Williams
通讯作者：
G. Williams