Highly porous nature of a primitive asteroid revealed by thermal imaging

doi:10.1038/s41586-020-2102-6

GSTDTAP > 地球科学

DOI	10.1038/s41586-020-2102-6
	Highly porous nature of a primitive asteroid revealed by thermal imaging
	Quinn, Robert A.1,2; Melnik, Alexey, V 1; Vrbanac, Alison 3; Fu, Ting 4; Patras, Kathryn A.3; Christy, Mitchell P.1; Bodai, Zsolt 5; Belda-Ferre, Pedro 3; Tripathi, Anupriya 1,3; Chung, Lawton K.3; Downes, Michael 4; Welch, Ryan D.4; Quinn, Melissa 6; Humphrey, Greg 3; Panitchpakdi, Morgan 1; Weldon, Kelly C.1,19; Aksenov, Alexander 1; da Silva, Ricardo 1; Avila-Pacheco, Julian 7; Clish, Clary 7; Bae, Sena 8,9; Mallick, Himel 7,8; Franzosa, Eric A.7,8; Lloyd-Price, Jason 7,8; Bussell, Robert 10; Thron, Taren 11; Nelson, Andrew T.1; Wang, Mingxun 1; Leszczynski, Eric 6; Vargas, Fernando 1; Gauglitz, Julia M.1; Meehan, Michael J.1; Gentry, Emily 1; Arthur, Timothy D.3,7; Komor, Alexis C.5; Poulsen, Orit 3; Boland, Brigid S.12; Chang, John T.12; Sandborn, William J.12; Lim, Meerana 3; Garg, Neha 13,14; Lumeng, Julie C.15; Xavier, Ramnik J.7; Kazmierczak, Barbara, I 16; Jain, Ruchi 16; Egan, Marie 17; Rhee, Kyung E.3; Ferguson, David 6; Raffatellu, Manuela 3; Vlamakis, Hera 7; Haddad, Gabriel G.3; Siegel, Dionicio 1; Huttenhower, Curtis 7,8; Mazmanian, Sarkis K.11; Evans, Ronald M.4,18; Nizet, Victor 1,3,19; Knight, Rob 3,19,20,21; Dorrestein, Pieter C.1,3,19
	2020-03-16
发表期刊	NATURE
ISSN	0028-0836
EISSN	1476-4687
出版年	2020
卷号	579 期号:7800 页码:518-522
文章类型	Article
语种	英语
国家	Japan; Germany; Scotland; France; South Korea; Spain
英文关键词	Carbonaceous (C-type) asteroids(1) are relics of the early Solar System that have preserved primitive materials since their formation approximately 4.6 billion years ago. They are probably analogues of carbonaceous chondrites(2,3) and are essential for understanding planetary formation processes. However, their physical properties remain poorly known because carbonaceous chondrite meteoroids tend not to survive entry to Earth' s atmosphere. Here we report on global one-rotation thermographic images of the C-type asteroid 162173 Ryugu, taken by the thermal infrared imager (TIR)(4) onboard the spacecraft Hayabusa2(5), indicating that the asteroid' s boulders and their surroundings have similar temperatures, with a derived thermal inertia of about 300 J m(-2) s(-0.5) K-1 (300 tiu). Contrary to predictions that the surface consists of regolith and dense boulders, this low thermal inertia suggests that the boulders are more porous than typical carbonaceous chondrites(6) and that their surroundings are covered with porous fragments more than 10 centimetres in diameter. Close-up thermal images confirm the presence of such porous fragments and the flat diurnal temperature profiles suggest a strong surface roughness effect(7,8). We also observed in the close-up thermal images boulders that are colder during the day, with thermal inertia exceeding 600 tiu, corresponding to dense boulders similar to typical carbonaceous chondrites(6). These results constrain the formation history of Ryugu: the asteroid must be a rubble pile formed from impact fragments of a parent body with microporosity(9) of approximately 30 to 50 per cent that experienced a low degree of consolidation. The dense boulders might have originated from the consolidated innermost region or they may have an exogenic origin. This high-porosity asteroid may link cosmic fluffy dust to dense celestial bodies(10). Thermal imaging data obtained from the spacecraft Hayabusa2 reveal that the carbonaceous asteroid 162173 Ryugu is an object of unusually high porosity.
领域	地球科学 ; 气候变化 ; 资源环境
收录类别	SCI-E
WOS记录号	WOS:000519841400001
WOS关键词	162173 RYUGU ; SURFACE ; MISSION ; ONBOARD ; SAMPLE ; RETURN
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
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引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/249242
专题	地球科学资源环境科学
作者单位	1.Univ Calif San Diego, Collaborat Mass Spectrometry Innovat Ctr, Skaggs Sch Pharm & Pharmaceut Sci, San Diego, CA 92103 USA; 2.Michigan State Univ, Dept Biochem & Mol Biol, E Lansing, MI 48824 USA; 3.Univ Calif San Diego, Dept Pediat, San Diego, CA 92103 USA; 4.Salk Inst Biol Studies, Gene Express Lab, San Diego, CA USA; 5.Univ Calif San Diego, Dept Chem & Biochem, San Diego, CA 92103 USA; 6.Michigan State Univ, Dept Kinesiol, E Lansing, MI 48824 USA; 7.Broad Inst MIT & Harvard, Cambridge, MA 02142 USA; 8.Harvard TH Chan Sch Publ Hlth, Dept Biostat, Boston, MA USA; 9.Harvard TH Chan Sch Publ Hlth, Dept Immunol & Infect Dis, Boston, MA USA; 10.Univ Calif San Diego, Dept Radiol, San Diego, CA 92103 USA; 11.CALTECH, Div Biol & Biol Engn, Pasadena, CA 91125 USA; 12.Univ Calif San Diego, Dept Med, Div Gastroenterol, San Diego, CA 92103 USA; 13.Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA; 14.Emory Childrens Cyst Fibrosis Ctr, Atlanta, GA USA; 15.Univ Michigan, Dept Pediat, Ann Arbor, MI 48109 USA; 16.Yale Sch Med, Dept Internal Med, New Haven, CT USA; 17.Yale Sch Med, Dept Pediat, New Haven, CT USA; 18.Howard Hughes Med Inst, Salk Inst Biol Studies, San Diego, CA USA; 19.Univ Calif San Diego, UCSD Ctr Microbiome Innovat, San Diego, CA 92103 USA; 20.Univ Calif San Diego, Dept Comp Sci & Engn, San Diego, CA 92103 USA; 21.Univ Calif San Diego, Dept Engn, San Diego, CA 92103 USA
推荐引用方式 GB/T 7714	Quinn, Robert A.,Melnik, Alexey, V,Vrbanac, Alison,et al. Highly porous nature of a primitive asteroid revealed by thermal imaging[J]. NATURE,2020,579(7800):518-522.
APA	Quinn, Robert A..,Melnik, Alexey, V.,Vrbanac, Alison.,Fu, Ting.,Patras, Kathryn A..,...&Dorrestein, Pieter C..(2020).Highly porous nature of a primitive asteroid revealed by thermal imaging.NATURE,579(7800),518-522.
MLA	Quinn, Robert A.,et al."Highly porous nature of a primitive asteroid revealed by thermal imaging".NATURE 579.7800(2020):518-522.