DART, the Double Asteroid Redirection Test, successfully impacted asteroid Dimorphos on September 26, 2022, becoming the first mission to demonstrate asteroid deflection. Shared live via a NASA broadcast, over a million concurrent viewers around the world watched as the DART spacecraft streamed images to Earth up to the final second before its impact with Dimorphos. In this paper, we share the final phases of the DART encounter and the latest results from the DART Investigation Team's analysis of ground and space-based data. This includes measurements on the amount of deflection that DART imparted on Dimorphos, a determination of the momentum transfer enhancement factor, and results on understanding the geology and surface characteristics of the impact site. The success of the DART mission paves the future for a bold international Planetary Defense program. We also share ideas on bolstering international coordination, developing new technologies that can mitigate different types of asteroid threats, and closing identified gaps in our overall preparedness.

中文翻译：

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DART：Dimorphos 撞击的最新结果以及对未来行星防御计划的展望

DART（双小行星重定向测试）于 2022 年 9 月 26 日成功撞击小行星 Dimorphos，成为第一个演示小行星偏转的任务。通过 NASA 广播进行现场分享，全球超过 100 万观众同时观看了 DART 航天器将图像传输到地球，直至其撞击 Dimorphos 之前的最后一秒。在本文中，我们分享了 DART 遭遇的最后阶段以及 DART 调查小组对地面和天基数据分析的最新结果。这包括测量 DART 对 Dimorphos 施加的偏转量、确定动量传递增强因子，以及了解撞击地点的地质和表面特征的结果。 DART 任务的成功为大胆的国际行星防御计划铺平了未来。我们还就加强国际协调、开发可以减轻不同类型小行星威胁的新技术以及缩小我们整体准备工作中已发现的差距等问题分享想法。