The return of samples from S-type asteroid 25143 Itokawa have enabled significant improvements in our understanding of space weathering on asteroids and the link between S-type asteroids and ordinary chondrites. We report on three new particles, providing details on space weathering of adjacent grains within a particle and several different phases. The features we observe are consistent with formation via irradiation from the solar wind, as opposed to micrometeoroid bombardment. We also see differences in the degree of weathering for grains collected from the two different touchdown locations on the asteroid. Continued analysis of new grains from Itokawa allow us to draw a more complete picture of the variety of space weathering features and the processes that lead to their formation on Itokawa and other airless bodies.

中文翻译：

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丝川三种粒子的空间风化特征比较

来自 S 型小行星 25143 Itokawa 的样本的返回使我们对小行星的空间风化以及 S 型小行星与普通球粒陨石之间的联系的理解有了重大改进。我们报告了三个新粒子，提供了粒子内相邻粒子和几个不同阶段的空间风化的详细信息。我们观察到的特征与通过太阳风辐射形成的特征一致，而不是微流星体轰击。我们还看到从小行星上两个不同着陆位置收集的谷物的风化程度存在差异。对来自 Itokawa 的新颗粒的持续分析使我们能够更全面地了解各种空间风化特征以及导致它们在 Itokawa 和其他无空气天体上形成的过程。