NASA's OSIRIS-REx mission observed millimeter- to centimeter-scale pebbles being ejected from the surface of asteroid (101955) Bennu, indicating that Bennu is an active asteroid. About 30% of these particles escape from Bennu, and the minimum orbital intersection distance (MOID) between Bennu and Earth suggest the possibility of a “Bennuid” particle flux at Earth. We characterize the evolution of Bennu's particle stream and potential for meteor flux by simulating weekly particle ejections between the years 1780 and 2135 continuing their dynamical evolution until 2200. Ejections are modeled as a discrete release of 95 particles every week. The meteoroid stream is found to be fully distributed around Bennu's orbital path in years. Individual particles and streams remain associable to Bennu for the entire 420 years simulated. Particle flux at Earth is predicted to begin in 2101, as the Bennu-Earth MOID reaches minimum values. The year of highest particle flux, 2182, experiences 161 Earth intersections and accounts for 1/4 of our predicted meteors. Our methods can be expanded to study the history and structure of the general meteoroid population and to estimate flux from specific near-Earth asteroids.

中文翻译：

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Bennu 的自然样本传送机制：估计地球上 Bennuid 流星的通量

NASA 的 OSIRIS-REx 任务观察到从小行星 (101955) Bennu 表面喷射出毫米到厘米级的鹅卵石，表明 Bennu 是一颗活跃的小行星。这些粒子中约有 30% 会从 Bennu 逃逸，Bennu 和地球之间的最小轨道交叉距离 (MOID) 表明地球上可能存在“Bennuid”粒子通量。我们通过模拟 1780 年和 2135 年之间每周的粒子抛射持续到 2200 年的动力学演变来表征 Bennu 粒子流的演变和流星通量的潜力。抛射被建模为每周 95 个粒子的离散释放。发现流星体流完全分布在 Bennu 的轨道路径周围年。在模拟的整个 420 年中，单个粒子和流与 Bennu 保持关联。随着 Bennu-Earth MOID 达到最小值，地球上的粒子通量预计将在 2101 年开始。粒子通量最高的年份 2182 年经历了 161 个地球交叉点，占我们预测的流星的 1/4。我们的方法可以扩展到研究一般流星体种群的历史和结构，并估计来自特定近地小行星的通量。