Asteroid Interiors and Morphology
Asteroid Interiors and Morphology
复制标题
小行星内部和形态
DOI：
10.2458/azu_uapress_9780816532131-ch038
复制
发表时间：
2015
期刊：
影响因子：
64.8
通讯作者：
K. Holsapple
中科院分区：
文献类型：
--
作者：
D. Scheeres;D. Britt;B. Carry;K. Holsapple
在过去的十年里，在解决小行星内部问题和神秘问题的各种重要投入方面取得了一系列惊人的进展。其中包括开发一个有关小行星成分强度的大型数据库，如流星和陨石所证明的那样（第 2 节）；根据地面观测编制小行星的广泛密度和推断孔隙度（第 3 节）；开发新的计算技术，用于模拟小行星碎石堆在极端旋转速率下如何变形、裂变或脱落（第 4 节）；以及对特定小行星体独特的地球物理学的重要见解的发展（第 6 节）。本章将回顾这些不同领域的进展，试图统一这些不同的主题，并展示该领域未来可以取得的进展。关于小行星内部的知识是理解这些天体的一个重要方面，因为它提供了有关它们进化历史的线索，反过来又为太阳系的历史提供了强有力的约束。与小行星表面不同，不可能直接观察物体内部或轻松地从物体内部进行样本测量。因此，小行星内部的研究必须依靠测量和理论的结合来发展对内部环境的约束。鉴于这些限制，之前的调查研究了可能与其内部性质有关的可观察特征。话虽这么说，有一些测量技术可以探测物体的内部特性，特别是通过地震和雷达探测测量。这些将在第 5 节中讨论，并代表该领域未来进步的潜在来源。小行星与其内部结构相关的最容易理解的特征是质量、密度、形状和自转。这些受到内部结构以及该结构的强度和机械性能的强烈约束。通过关注这些具体的可观察结果，我们可以开始回答有关这些天体的基本问题：它们有多强大？这种力量的本质是什么？内部的瓦砾堆是充满各种尺寸尺度的空隙，还是坚固的连贯结构？这些特性如何取决于成分、形状、旋转、大小或位置？自《小行星 III》卷出版以来，回答上述问题的重要步骤已经发生
The past decade has seen an astonishing array of advances across a wide spectrum of important inputs to the problem and mystery of asteroid interiors. These include the development of a large database concerning asteroid component strengths, as evidenced by meteors and meteorites (section 2); the compilation of extensive densities and inferred porosities for asteroids based on groundbased observations (section 3); the development of new computational techniques for the simulation of how asteroid rubble piles deform and fission or shed mass when subject to extreme rotation rates (section 4); and the development of crucial insights into the unique geophysics of specific asteroidal bodies (section 6). This chapter will review these different areas of advancements in an attempt to unify these disparate topics and show where future progress can be made in this field. Knowledge about asteroid interiors is a crucial aspect for understanding these bodies, as it provides clues about their evolutionary history, in turn providing strong constraints on the history of the solar system. Unlike asteroid surfaces, it is impossible to peer directly within or easily take a sample measurement from within a body. Thus the study of asteroid interiors must rely on a combination of measurement and theory to develop constraints on the interior environment. Given these restrictions, previous investigations have studied observable characteristics that may be related to the nature of their interiors. This being said, there are measurement techniques that can probe the interior properties of bodies, in particular through seismic and radar sounding measurements. These are discussed in section 5 and represent a potential source for future advancements in this field. The most accessible features of an asteroid that are related to their interior structure are the mass, density, shape, and spin. These are strongly constrained by the interior structure, and by the strength and mechanical properties of that structure. By focusing on these specific observables, we can start to answer basic questions about these bodies: How strong are they? What is the nature of that strength? Are the interiors rubble piles full of voids at various size scales, or are they solid coherent structures? How do these properties depend on composition, shape, spin, size, or location? Important steps in answering the above questions have occurred since the publication of the Asteroids III volume
小行星自旋裂变系统
DOI：
--
发表时间：
2014
期刊：
Asteroids, Comets, Meteors 2014
影响因子：
--
作者：
Pravec P.
通讯作者：
Pravec P.