论文标题
小行星表面（101955）bennu表面周围掉落颗粒的稳定性和演变
Stability and Evolution of Fallen Particles Around the Surface of Asteroid (101955) Bennu
论文作者
论文摘要
在这项工作中，我们研究了Bennu周围颗粒的动力学。目的是了解小行星周围模拟颗粒的稳定性，进化和最终结果。根据结果，粒径可以根据其行为分为两个主要组。小于一厘米的颗粒通过太阳辐射压力迅速从系统中取出，而大于几厘米的颗粒的动力学由Bennu的重力场主导。由于其形状和自旋时期，Bennu周围有8个平衡点。赤道表面附近的相空间的结构直接连接到这些平衡点。因此，我们进行了数值模拟，以获取有关平衡点附近轨道演化的信息。结果表明，大多数大于几厘米的颗粒落在靠近翠鸟区域的赤道区域或靠近与之相反的区域的近距离区域。相反，几乎没有这些颗粒落在靠近鱼鹰区域的赤道区域。此外，我们还考虑了最初绕bennu的粒子的球形云进行计算实验。在我们的整合周期内，大多数颗粒属于表面，限于1.14年。颗粒优先落在低赤道纬度的高海拔区域附近，靠近北极。中纬度地区是瀑布更枯竭的人，就像在夜莺和砂面包区域一样。
In this work, we study the dynamics of particles around Bennu. The goal is to understand the stability, evolution, and final outcome of the simulated particles around the asteroid. According to the results, the particle sizes can be divided into two main groups depending on their behavior. Particles smaller than a centimeter are quickly removed from the system by solar radiation pressure, while the dynamics of particles larger than a few centimeters is dominated by the gravitational field of Bennu. Because of its shape and spin period, Bennu has eight equilibrium points around it. The structure of the phase space near its equatorial surface is directly connected to these equilibrium points. Therefore, we performed numerical simulations to obtain information about the orbital evolution near the equilibrium points. The results show that most of the particles larger than a few centimeters fall in the equatorial region close to the Kingfisher area or close to the region diametrically opposite to it. In contrast, almost none of these particles fall in the equatorial region close to the Osprey area. In addition, we also performed computational experiments considering a spherical cloud of particles initially orbiting Bennu. Most of the particles in prograde orbits fall on the surface within our integration period, which was limited to 1.14 years. The particles preferentially fall near high-altitude regions at low equatorial latitudes and close to the north pole. The mid-latitudes are those more depleted of falls, as in the Nightingale and Sandpiper areas.
