通过深度非检测消除2006年QV89的虚拟撞击物
Elimination of a virtual impactor of 2006 QV89 via deep non-detection
摘要：
由于发现了大量（而且越来越多）近地物体，其中一些在能够牢固地确定轨道以确保长期回收之前就丢失了。其中一小部分与地球发生碰撞的可能性不可忽视。我们提出了一种有针对性的观测方法，使我们能够通过获得物体所在区域的深层图像来消除这种风险，如果它位于碰撞轨道上。2006年QV 89是其中一个天体，有可能在2019年9月9日撞击地球。它的位置不确定性（1度）和模糊（低于V $\sim$ 24）使其成为传统直接恢复的困难候选者。然而，虚拟撞击物的位置可以非常精确地确定。2019年7月，2006 QV 89的虚拟撞击物位置特别好，不确定性区域非常小，预计震级为V $<$ 26。在欧空局/欧洲南方天文台近地天体合作的背景下，使用欧洲南方天文台的甚大望远镜对该区域进行了成像，导致非常难以探测到。这导致消除了虚拟撞击物，即使没有有效地回收2006年QV 89，表明它不构成威胁。这种深度探测不到虚拟撞击物的方法显示出很大的潜力，可以消除其他难以回收的近地天体的威胁
英文摘要：
As a consequence of the large (and growing) number of near-Earth objects discovered, some of them are lost before their orbit can be firmly established to ensure long-term recovery. A fraction of these present non-negligible chances of impact with the Earth. We present a method of targeted observations that allowed us to eliminate that risk by obtaining deep images of the area where the object would be, should it be on a collision orbit. 2006 QV89 was one of these objects, with a chance of impact with the Earth on 2019 September 9. Its position uncertainty (of the order of 1 degree) and faintness (below V$\sim$24) made it a difficult candidate for a traditional direct recovery. However, the position of the virtual impactors could be determined with excellent accuracy. In July 2019, the virtual impactors of 2006 QV89 were particularly well placed, with a very small uncertainty region, and an expected magnitude of V$<$26. The area was imaged using ESO's Very Large Telescope, in the context of the ESA/ESO collaboration on Near-Earth Objects, resulting in very constraining a non-detection. This resulted in the elimination of the virtual impactor, even without effectively recovering 2006 QV89, indicating that it did not represent a threat. This method of deep non-detection of virtual impactors demonstrated a large potential to eliminate the threat of other-wise difficult to recover near-Earth objects
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