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Is the Massalia family of asteroids the source of the L-chondrite meteorites?

马萨利亚小行星家族是 L 球粒陨石的来源吗？

基本信息

批准号：
1841809
负责人：
Michael Gaffey
金额：
$ 46.97万
依托单位：
University of North Dakota Main Campus
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-06-01 至 2023-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1841809&HistoricalAwards=false
关键词：
Massalia family asteroids source chondrite

项目摘要

Asteroids have long been believed to be the primary source of meteorites. In many cases, ?parent? bodies of meteorites have been determined by comparing the way those meteorites and specific asteroids reflect sunlight. However, the parent body of the most common type of meteorites seen to fall, known as ordinary chondrites, has yet to be firmly identified. The team's hypothesis is that a group known as L-chondrites come from the (20) Massalia family of asteroids (An asteroid family is a group of asteroids with orbits more similar than would be expected by chance). The team will use telescopes to break down the light reflected by the Massalia asteroids for comparison with L-chondrites studied in the laboratory. Both undergraduate and graduate students will be included in the research. This project is jointly funded by NSF AST and the Established Program to Stimulate Competitive Research (EPSCoR).Main belt asteroids are the sole surviving in situ remnants from the formation epoch of the inner Solar System. With few exceptions, meteorites are samples of main belt asteroids. Meteorites thus provide a window into the condition and processes in the late stages of the solar nebula and the earliest evolution of the inner Solar System. Studying meteorites tells us about the geochemistry and petrology of the Solar System, and about its age (from radiometric dating), but nothing about where these processes occurred. If the L-chondrites can be linked to a specific asteroid family, the late nebular and early solar system location of the conditions and processes recorded by the L-chondrites can be constrained. Moreover, the age of that family can be established by the shock ages of the L-chondrites. A firm constraint on the age of a family would allow a more rigorous testing and refining of dynamical models of orbital diffusion in the asteroid belt. Such models are important for: A) constraining the sources of Earth-approaching meteoroids and asteroids, B) for modeling the dynamical evolution of the asteroid population, and C) for estimating the ages of other asteroid families and hence the frequency of large collisions in the belt. The overall goal of the present study is to test the (20) Massalia asteroid family as a potential source of the L-chondrites. This work will be done by comparing spectra of Massalia asteroids for comparison with laboratory spectra of L-chondritic meteorites.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

小行星一直被认为是陨石的主要来源。在许多情况下，？家长？通过比较这些陨石和特定小行星反射阳光的方式来确定陨石的主体。然而，最常见的陨石类型的母体，被称为普通陨石，尚未被确定。该团队的假设是，一组被称为L-小行星来自（20）Massalia家族的小行星（小行星家族是一组轨道比偶然预期的更相似的小行星）。该团队将使用望远镜分解Massalia小行星反射的光，以与实验室研究的L-Brontes进行比较。本科生和研究生都将参加这项研究。该项目由NSF AST和刺激竞争性研究既定计划（EPSCoR）共同资助。主带小行星是内太阳系形成时期唯一幸存的原地残留物。除了少数例外，陨石是主带小行星的样本。因此，陨石提供了一个窗口，在太阳星云的后期阶段和内太阳系的最早演化的条件和过程。研究陨石可以告诉我们太阳系的地球化学和岩石学，以及它的年龄（通过放射性测年法），但不能告诉我们这些过程发生在哪里。如果可以将L-Brontes与一个特定的小行星家族联系起来，就可以限制L-Brontes记录的条件和过程的晚期星云和早期太阳系位置。此外，该家族的年龄可以通过L-型人的休克年龄来确定。对家庭年龄的严格限制将有助于更严格地测试和改进小行星带轨道扩散的动力学模型。这种模式对于以下方面很重要：A）限制接近地球的流星体和小行星的来源，B）模拟小行星群的动态演变，以及C）估计其他小行星家族的年龄，从而估计小行星带中大型碰撞的频率。本研究的总体目标是测试（20）Massalia小行星家族是否是L型小行星的潜在来源。这项工作将通过比较Massalia小行星的光谱与实验室光谱的L-陨石进行比较。这个奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。