A collision in 2009 as the origin of the debris trail of asteroid P/2010 A2.
A collision in 2009 as the origin of the debris trail of asteroid P/2010 A2.
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2009 年的一次碰撞是小行星 P/2010 A2 碎片轨迹的起源。
DOI：
10.1038/nature09453
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发表时间：
2010
期刊：
影响因子：
64.8
通讯作者：
Snodgrass C
中科院分区：
文献类型：
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作者：
Snodgrass C
这颗奇特的天体P/2010 A2是在2010年1月被发现的，尽管中心没有凝结或昏迷，但由于存在物质痕迹，它被命名为彗星。这颗天体在主小行星带内部的小行星轨道（小偏心和小倾角）上的出现引起了人们的注意，因为它可能是最近公认的主带彗星类别的新成员。如果得到证实，这个新天体将扩大发现主带彗星的日心距离范围。在这里，我们报告罗塞塔飞船对P/2010 A2的观测。我们的结论是，这条痕迹是由一个单一的事件引起的，而不是彗星活动的一个时期，与独立的结果一致。这条轨迹是由相对较大的毫米到厘米大小的颗粒组成的，它们仍然靠近母小行星。轨迹的形状可以解释为最初的撞击喷射出大块碎片，这些碎片几乎立即分解和分散。我们确定这是发生在2009年2月10日左右的小行星碰撞。
The peculiar object P/2010 A2 was discovered in January 2010 and given a cometary designation because of the presence of a trail of material, although there was no central condensation or coma. The appearance of this object, in an asteroidal orbit (small eccentricity and inclination) in the inner main asteroid belt attracted attention as a potential new member of the recently recognized class of main-belt comets. If confirmed, this new object would expand the range in heliocentric distance over which main-belt comets are found. Here we report observations of P/2010 A2 by the Rosetta spacecraft. We conclude that the trail arose from a single event, rather than a period of cometary activity, in agreement with independent results. The trail is made up of relatively large particles of millimetre to centimetre size that remain close to the parent asteroid. The shape of the trail can be explained by an initial impact ejecting large clumps of debris that disintegrated and dispersed almost immediately. We determine that this was an asteroid collision that occurred around 10 February 2009.