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arXiv 2003.11411astro-ph.EP
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小行星三联体系统2001 SN263:表面特征和动力学环境

Asteroid triple system 2001 SN263 : surfaces characteristics and dynamical environment

O. C. Winter, G. Valvano, T. S. Moura, G. Borderes-Motta, A. Amarante, R. Sfair

摘要:

(153591)2001 SN 263小行星系统是巴西第一次行星际空间飞行任务的目标,是近地小行星群中已知的三个三重系统之一。任务目标之一是收集有关该系统形成的数据。对这些数据的分析将有助于研究该系统的组成部分(α,β和γ)的物理和动力学结构,以找到与其起源有关的痕迹。在这项工作中,我们假设的不规则形状的2001 SN 263系统组件作为均匀密度多面体和计算调查的引力场产生的这些机构。目标是探索每个组件周围的表面和环境的动态特性。然后,考虑到旋转速度,我们分析了它们的地形特征,通过几何高度,倾斜,重力位,坡度,表面加速度,等等。此外,对这些物体周围环境的调查使得有可能绘制出零速度曲线,从而划定平衡点的位置。阿尔法分量有一个特殊的12个平衡点,所有这些平衡点都非常接近它的表面。在Beta和Gamma的情况下,我们发现四个平衡点不那么接近它们的表面。然后,在它们的平衡点附近进行数值实验,我们确定了一个稳定区域的位置和大小,该稳定区域与Beta周围的平衡点相关。最后,我们整合了Alpha周围的球形粒子云,并确定了粒子在Alpha表面的下落位置。

英文摘要:

The (153591) 2001 SN263 asteroid system, target of the first Brazilian interplanetary space mission, is one of the known three triple systems within the population of NEAs. One of the mission objectives is to collect data about the formation of this system. The analysis of these data will help in the investigation of the physical and dynamical structures of the components (Alpha, Beta and Gamma) of this system, in order to find vestiges related to its origin. In this work, we assume the irregular shape of the 2001 SN263 system components as uniform density polyhedra and computationally investigate the gravitational field generated by these bodies. The goal is to explore the dynamical characteristics of the surface and environment around each component. Then, taking into account the rotational speed, we analyze their topographic features through the quantities geometric altitude, tilt, geopotential, slope, surface accelerations, among others. Additionally, the investigation of the environment around the bodies made it possible to construct zero-velocity curves, which delimit the location of equilibrium points. The Alpha component has a peculiar number of 12 equilibrium points, all of them located very close to its surface. In the cases of Beta and Gamma, we found four equilibrium points not so close to their surfaces. Then, performing numerical experiments around their equilibrium points, we identified the location and size of just one stable region, which is associated with an equilibrium point around Beta. Finally, we integrated a spherical cloud of particles around Alpha and identified the location on the surface of Alpha were the particles have fallen.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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