Spectroscopic Properties of Asteroid Families
Spectroscopic Properties of Asteroid Families
复制标题
小行星家族的光谱特性
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
D. Lazzaro
中科院分区：
文献类型：
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作者：
A. Cellino;S. Bus;A. Doressoundiram;D. Lazzaro
在过去的十年里，小行星家族一直是几次专门的光谱观测活动的目标。初步研究主要致力于通过对轨道固有元素空间中物体的分布进行纯粹的统计分析来确认分组的宇宙化学可靠性。这些早期的尝试导致了对某些族的共同碰撞起源的一些惊人的确认，例如与灶神星 4 相关的起源。随后，光谱研究开始主要集中在表征不同族的整体矿物成分的问题上，同时寻找原始母体热分化的可能证据以及正在进行的太空风化过程的可能证据。事实证明，光谱学对于识别可能的闯入者至关重要，这些闯入者可能会严重影响族的尺寸分布以及碎片喷射速度原始场的重建。与此同时，光谱特性已被认为是评估在适当元素空间中相互重叠的族的真实成员资格的宝贵工具。此外，光谱调查通常被发现是对纯粹基于识别适当元素空间中物体浓度的传统家庭搜索的极好补充。一个具有挑战性的未解决问题来自于这样一个事实：已发现几个家族表现出特殊的光谱特性。这为小行星分类类别解释的未来发展开辟了新的令人兴奋的可能性。
Asteroid families have been the target of several dedicated campaigns of spectroscopic observations during the last 10 years. Preliminary studies were mainly devoted to obtain a confirmation of the cosmochemical reliability of groupings identified by purely statistical analyses of the distributions of objects in the space of the orbital proper elements. These early attempts led to some spectacular confirmations of the common collisional origin of some families, like that associated with 4 Vesta. Subsequently, spectroscopic investigations started to be mostly focused on the issue of characterizing the overall mineralogical compositions of different families, at the same time looking for possible evidence of thermal differentiation of the original parent bodies and for possible evidence of ongoing space-weathering processes. Spectroscopy has also proven to be crucially needed to identify likely interlopers that can seriously affect the derived size distributions of families and the reconstruction of the original fields of ejection velocity of the fragments. At the same time, spectroscopic properties have been recognized as an invaluable tool to assess the real memberships of families mutually overlapping in the space of proper elements. Moreover, spectroscopic surveys have in general been found to be an excellent complement to conventional family searches purely based on the identification of concentrations of objects in the proper-element space. A challenging unsolved problem comes from the fact that several families have been found to exhibit peculiar spectroscopic properties. This opens up new exciting possibilities for future developments in the interpretation of asteroid taxonomic classes.