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Thermophysical characteristics of the large main-belt asteroid (349) Dembowska
Yu, Liang Liang1,2; Yang B(杨彬)3,4; Ji, Jianghui2; Ip, Wing-Huen1,5; Yu, Liang Liang(Macau Univ Sci & Technol, Space Sci Inst, Taipa, Macao, Peoples R China)
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2017-12-01
卷号472期号:2页码:2388-2397
DOI10.1093/mnras/stx2089
产权排序第4完成单位
收录类别SCI
关键词Radiation Mechanisms: Thermal Minor Planets Asteroids: Individual: (349) Dembowska Infrared: General
摘要(349) Dembowska is a large, bright main-belt asteroid that has a fast rotation and an oblique spin axis. It might have experienced partial melting and differentiation. We constrain Dembowska's thermophysical properties, such as thermal inertia, roughness fraction, geometric albedo and effective diameter within 3s uncertainty of Gamma = 20(-7)(+12) Jm(-2) s(-0.5) K-1, fr = 0.25(-0.25)(+0.60), p(v) = 0.309(-0.038)(+0.026) and D-eff = 155.8(-6.2)(+7.5) km, by utilizing the advanced thermophysical model to analyse four sets of thermal infrared data obtained by the Infrared Astronomy Satellite (IRAS), AKARI, the Wide-field Infrared Survey Explorer (WISE) and the Subaru/Cooled Mid-Infrared Camera and Spectrometer (COMICS) at different epochs. In addition, by modelling the thermal light curve observed by WISE, we obtain the rotational phases of each data set. These rotationally resolved data do not reveal significant variations of thermal inertia and roughness across the surface, indicating that the surface of Dembowska should be covered by a dusty regolith layer with few rocks or boulders. Besides, the low thermal inertia of Dembowska shows no significant difference with other asteroids larger than 100 km, which indicates that the dynamical lives of these large asteroids are long enough to make their surfaces have sufficiently low thermal inertia. Furthermore, based on the derived surface thermophysical properties, as well as the known orbital and rotational parameters, we can simulate Dembowska's surface and subsurface temperatures throughout its orbital period. The surface temperature varies from similar to 40 to similar to 220 K, showing significant seasonal variation, whereas the subsurface temperature achieves equilibrium temperature about 120-160 K below a depth of 30-50 cm.
项目资助者National Natural Science Foundation of China(11473073, 11403105, 11661161013, 11633009) ; Science and Technology Development Fund of Macau(039/2013/A2, 017/2014/A1) ; innovative and interdisciplinary programme by the Chinese Academy of Sciences(KJZD-EW-Z001) ; Natural Science Foundation of Jiangsu Province(BK20141509) ; Foundation of Minor Planets of Purple Mountain Observatory
语种英语
学科领域天文学
文章类型Article
ISSN0035-8711
URL查看原文
WOS记录号WOS:000413082900083
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]NEAR-EARTH ASTEROIDS ; THERMAL INERTIA ; SHAPE ; MODEL
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/11950
专题其他
通讯作者Yu, Liang Liang(Macau Univ Sci & Technol, Space Sci Inst, Taipa, Macao, Peoples R China)
作者单位1.Space Science Institute, Macau University of Science and Technology, Taipa, Macau
2.CAS Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China
3.European Southern Observatory, Alonso de C´ordova 3107, Vitacura, Casilla 19001, Santiago, Chile
4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China
5.Institute of Astronomy, National Central University, Jhongli, Taoyuan City 32001, Taiwan
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Yu, Liang Liang,Yang B,Ji, Jianghui,et al. Thermophysical characteristics of the large main-belt asteroid (349) Dembowska[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,472(2):2388-2397.
APA Yu, Liang Liang,Yang B,Ji, Jianghui,Ip, Wing-Huen,&Yu, Liang Liang.(2017).Thermophysical characteristics of the large main-belt asteroid (349) Dembowska.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,472(2),2388-2397.
MLA Yu, Liang Liang,et al."Thermophysical characteristics of the large main-belt asteroid (349) Dembowska".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 472.2(2017):2388-2397.
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