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arXiv 2603.28107astro-ph.EP
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天问-2目标小行星(469219)卡莫奥阿勒瓦的形状、风化层厚度、SMFe^0含量及光谱类型

Shape, regolith size and thickness, SMFe^0 content, and spectral type of Tianwen-2 target asteroid (469219) Kamo'oalewa

Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences（中国科学院地球化学研究所）；State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology（澳门科技大学）；School of Engineering, Guangzhou College of Technology and Business（广州工商学院）；ESA ESRIN/PDO/NEO Coordination Centre（欧洲航天局地球系统数据中心）；Deimos Italia；Aix Marseille Université, CNRS, CNES, Laboratoire d’Astrophysique de Marseille（马赛大学）；Institute of Analysis and testing, Beijing Academy of Science and Technology, Beijing Center for Physical & Chemical Analysis（北京科学院测试技术研究所）；Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology, Institute of Systems Engineering, Chongqing（重庆大学）；Shandong Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, School of Space Science and Physics, Institute of Space Sciences, Shandong University（山东大学）；State Key Laboratory of Space Weather, National Space Science Center, Chinese Academy of Sciences（中国科学院国家空间科学中心）
Pengfei Zhang, Guozheng Zhang, Yongxiong Zhang, Marco Fenucci, Pierre Vernazza, Jin Zhao, Yunbo Niu, Xuejin Lu, Xing Wu, Honglei Lin, Edward Cloutis, Xiaoran Ya… 展开作者

Pengfei Zhang, Guozheng Zhang, Yongxiong Zhang, Marco Fenucci, Pierre Vernazza, Jin Zhao, Yunbo Niu, Xuejin Lu, Xing Wu, Honglei Lin, Edward Cloutis, Xiaoran Yan, Xiaoping Lu, Xiaobin Wang, Xiaoping Zhang, Yang Li

备注：
16 pages, 8 figures, under revision in Astronomy & Astrophysics
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AI总结：

研究通过光曲线数据和Cellinoid模型估算小行星卡莫奥阿勒瓦的形状、风化层粒径及厚度、SMFe^0含量和光谱类型，为样本返回任务提供关键参数。

摘要：

中国天问-2探测器将从近地小行星(469219)卡莫奥阿勒瓦返回样本。我们先前报告称，卡莫奥阿勒瓦具有LL球粒陨石组成、高度空间风化的表面。本研究旨在估算卡莫奥阿勒瓦的形状、风化层粒径及厚度、亚微米铁(SMFe0)含量和光谱类型。利用光曲线数据和Cellinoid模型，我们建模了卡莫奥阿勒瓦的形状、自转周期和极点方位。随后，我们使用重力、内聚力和离心力的平衡方法，估算其全球风化层临界粒径的分布。此外，在253.15至473.15 K的温度范围内，我们测量了最符合卡莫奥阿勒瓦光谱的激光照射LL球粒陨石粉末的热参数，估算卡莫奥阿勒瓦的热惯性和皮肤深度（风化层厚度的下限）。利用辐射传输混合模型，我们还估算出卡莫奥阿勒瓦风化层中SMFe0的含量。最后，使用MIT在线光谱分类工具对激光照射的LL球粒陨石粉末进行分类，获得了卡莫奥阿勒瓦的虚拟光谱类型。我们的模型给出卡莫奥阿勒瓦的尺寸为68米x46米x39米，自转周期为27.66分钟，极点方位为134.7度经度和-11.4度纬度。粒径小于2厘米的风化层颗粒可以稳定存在于卡莫奥阿勒瓦全球表面面积的93.8%。激光照射的LL球粒陨石粉末显示出低热惯性（95.5至135.1 J m^-2 K^-1 s^-1/2），对应于卡莫奥阿勒瓦上的热皮肤深度为3至3.5毫米。需要SMFe0含量为0.29±0.05 wt.%才能匹配卡莫奥阿勒瓦的光谱。卡莫奥阿勒瓦的虚拟光谱类型为

英文摘要：

China's Tianwen-2 spacecraft will return samples from the near-Earth asteroid (469219) Kamo'oalewa. We previously reported that Kamo'oalewa develops an LL-chondrite-compositional, highly space-weathered surface. This study aims to estimate Kamo'oalewa's shape, regolith grain size and thickness, sub-micrometer iron (SMFe0) content, and spectral type. Using the lightcurve data and the Cellinoid model, we modeled Kamo'oalewa's shape, rotation period, and pole orientation. We then estimated its global distribution of regolith critical size using the balance method of gravity, cohesive force, and centrifugal force. Furthermore, in the temperature range of 253.15 to 473.15 K, we measured the thermal parameters of laser-irradiated LL chondrite powder that best matches Kamo'oalewa's spectrum, estimating Kamo'oalewa's thermal inertia and skin depth (lower limit of regolith thickness). Using the radiative transfer mixing model, we also estimated the content of SMFe0 in Kamo'oalewa's regolith. Finally, using the MIT online spectral classification tool for the laser-irradiated LL chondrite powder, we obtained a virtual spectral type of Kamo'oalewa. Our model gives a size of 68 m x 46 m x 39 m, a rotation period of 27.66 minutes, and a pole orientation of 134.7 degrees longitude and -11.4 degrees latitude for Kamo'oalewa. Regolith grains with a size <2 cm can remain stable over 93.8% of the global surface area of Kamo'oalewa. Laser-irradiated LL chondrite powder shows a low thermal inertia (95.5 to 135.1 J m^-2 K^-1 s^-1/2), corresponding to a thermal skin depth of 3 to 3.5 mm on Kamo'oalewa. An SMFe0 content of 0.29 +- 0.05 wt.% is required to match Kamo'oalewa's spectrum. The virtual spectral type of Kamo'oalewa is given as "Sqw".

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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