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arXiv 1906.00876astro-ph.EP
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利用小行星的尘埃脱落作为微量样品将遥感测量与陨石种类联系起来

Using Dust Shed from Asteroids as Microsamples to Link Remote Measurements with Meteorite Classes

Barbara A. Cohen, Jamey R. Szalay, Andrew S. Rivkin, Jacob A. Richardson, Rachel E. Klima, Carolyn M. Ernst, Nancy L. Chabot, Zoltan Sternovsky, Mihaly Horányi

摘要:

鉴于小行星的成分多样性及其在太空中的分布,不可能考虑从每个小行星上返回样本以确定其起源。然而,原生矿物、水合硅酸盐和有机物质的速度和分子组成可以通过现场粉尘检测仪来确定。这种仪器可以对小行星脱落的微米级粒子云进行采样,从而提供与已知陨石群的直接联系,而无需将样本送回地面实验室。我们从LADEE测量的月球尘埃云模型扩展到显示,丰富的可检测的影响产生的微样本周围的小行星是一个函数的母体半径,日心距离,飞越距离和速度。我们使用蒙特卡洛模型来表明,如果在飞越过程中随机喷射并检测到几十到几百个粒子,那么将有足够的数量将母体归类为普通球粒陨石,玄武质无球粒陨石或其他类别的陨石。遇到和测量从近地和主带小行星脱落的微量样品,再加上补充成像和多光谱测量,可以完成对小型无空气天体的彻底定性。

英文摘要:

Given the compositional diversity of asteroids, and their distribution in space, it is impossible to consider returning samples from each one to establish their origin. However, the velocity and molecular composition of primary minerals, hydrated silicates, and organic materials can be determined by in situ dust detector instruments. Such instruments could sample the cloud of micrometer-scale particles shed by asteroids to provide direct links to known meteorite groups without returning the samples to terrestrial laboratories. We extend models of the measured lunar dust cloud from LADEE to show that the abundance of detectable impact-generated microsamples around asteroids is a function of the parent body radius, heliocentric distance, flyby distance, and speed. We use monte carlo modeling to show that several tens to hundreds of particles, if randomly ejected and detected during a flyby, would be a sufficient number to classify the parent body as an ordinary chondrite, basaltic achondrite, or other class of meteorite. Encountering and measuring microsamples shed from near-earth and main-belt asteroids, coupled with complementary imaging and multispectral measurements, could accomplish a thorough characterization of small, airless bodies.

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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