空间控制技术与应用2025，Vol.51Issue(5)：16-25,10.DOI:10.3969/j.issn.1674-1579.2025.05.002
基于JWST中红外观测数据的X-Complex小行星物理性质反演研究
Thermophysical Properties of X-Complex Asteroids Based on JWST Observations
摘要
Abstract
X-complex asteroids are an important group of celestial bodies that exhibit no diagnostic spectral features in the visible to near-infrared(VNIR)range and display diverse compositional types.Some of them may represent residual metallic cores of differentiated bodies,making them key targets for studying early solar system thermal evolution and space mining activities.Due to the lack of distinct spectral absorption characteristics in the VNIR band,thermal infrared hyperspectral observations serve as a crucial means for investigating X-complex asteroids.This study utilizes mid-infrared data from the James Webb Space Telescope(JWST)to analyze seven X-complex asteroids with poorly constrained physical properties.By applying the Near-Earth Asteroid Thermal Model(NEATM)and the Markov Chain Monte Carlo(MCMC)method,we inverted their emissivity,diameter,thermal inertia parameter,and geometric albedo.Leveraging the high spectral resolution of JWST across continuous bands,this study improves the reliability of inversion results compared to previous observations.The results indicate that the diameters of these seven asteroids range from 17.30 to 22.55 km,which is on average 41.5%smaller than the values in the Jet Propulsion Laboratory(JPL)database,suggesting a systematic overestimation of diameters for small X-complex asteroids in prior studies and consequently higher geometric albedos than previously recognized.The retrieved infrared emissivity spectra show that their emissivity is 0.064-0.093 lower than that of silicate asteroids,implying possible coverage by low-emissivity materials.All asteroids exhibit distinct spectral features in the mid-infrared range,further supporting the reliability of the inversion results.关键词
小行星/JWST/热物理模型/X-complex小行星/红外高光谱Key words
asteroid/JWST/thermophysical model/X-complex asteroid/infrared hyperspectroscopy分类
天文与地球科学引用本文复制引用
矫恒越,徐小萌,徐天弈,吴昀昭,金岩,张海波,刘志军..基于JWST中红外观测数据的X-Complex小行星物理性质反演研究[J].空间控制技术与应用,2025,51(5):16-25,10.基金项目
国家国防科技工业局空间碎片与小行星专项(KJSP2023020105) （KJSP2023020105）
