Physical properties of asteroid Dimorphos as derived from the DART impact

被引：25

作者：

Raducan, S. D. ^{[1
]}

Jutzi, M. ^{[1
]}

Cheng, A. F. ^{[2
]}

Zhang, Y. ^{[3
]}

Barnouin, O. ^{[2
]}

Collins, G. S. ^{[4
]}

Daly, R. T. ^{[2
]}

Davison, T. M. ^{[4
]}

Ernst, C. M. ^{[2
]}

Farnham, T. L. ^{[3
]}

Ferrari, F. ^{[5
]}

Hirabayashi, M. ^{[6
,7
]}

Kumamoto, K. M. ^{[8
]}

Michel, P. ^{[9
,10
]}

Murdoch, N. ^{[11
]}

Nakano, R. ^{[6
,7
]}

Pajola, M. ^{[12
]}

Rossi, A. ^{[13
]}

Agrusa, H. F. ^{[3
,9
]}

Barbee, B. W. ^{[14
]}

Syal, M. Bruck ^{[8
]}

Chabot, N. L. ^{[2
]}

Dotto, E. ^{[15
]}

Fahnestock, E. G. ^{[16
]}

Hasselmann, P. H. ^{[15
]}

Herreros, I. ^{[17
]}

Ivanovski, S. ^{[18
]}

Li, J. -Y. ^{[19
]}

Lucchetti, A. ^{[12
]}

Luther, R. ^{[20
]}

Ormo, J. ^{[17
]}

Owen, M. ^{[8
]}

Pravec, P. ^{[21
]}

Rivkin, A. S. ^{[2
]}

Robin, C. Q. ^{[11
]}

Sanchez, P. ^{[22
]}

Tusberti, F. ^{[12
]}

Wuennemann, K. ^{[20
]}

Zinzi, A. ^{[23
,24
]}

Epifani, E. Mazzotta ^{[15
]}

Manzoni, C. ^{[25
]}

May, B. H. ^{[25
]}

机构：

[1] Univ Bern, Phys Inst, Space Res & Planetary Sci, Bern, Switzerland

[2] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA

[3] Univ Maryland, Dept Aerosp Engn, College Pk, MD USA

[4] Imperial Coll London, Dept Earth Sci & Engn, London, England

[5] Politecn Milan, Dept Aerosp Sci & Technol, Milan, Italy

[6] Georgia Inst Technol, Guggenheim Sch Aerosp Engn, Atlanta, GA USA

[7] Auburn Univ, Dept Aerosp Engn, Auburn, AL USA

[8] Lawrence Livermore Natl Lab, Livermore, CA USA

[9] Univ Cote dAzur, Observ Cote dAzur, CNRS, Lab Lagrange, Nice, France

[10] Univ Tokyo, Sch Engn, Dept Syst Innovat, Tokyo, Japan

[11] Univ Toulouse, Inst Super Aeronaut & Espace ISAE SUPAERO, Toulouse, France

[12] INAF, OAPD Astron Observ Padova, Padua, Italy

[13] CNR, IFAC, Sesto Fiorentino, FI, Italy

[14] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

[15] INAF, Osservatorio Astron Roma, Rome, Italy

[16] CALTECH, Jet Prop Lab, Pasadena, CA USA

[17] CSIC, Ctr Astrobiol CAB, INTA, Torrejon De Ardoz, Spain

[18] INAF, Osservatorio Astron Trieste, Trieste, Italy

[19] Planetary Sci Inst, Tucson, AZ USA

[20] Leibniz Inst Evolut & Biodivers Sci, Museum Nat Kunde, Berlin, Germany

[21] Czech Acad Sci, Astron Inst, Ondrejov, Czech Republic

[22] Univ Colorado Boulder, Colorado Ctr Astrodynam Res, Boulder, CO USA

[23] Agenzia Spaziale Italiana, Rome, Italy

[24] ASI Space Sci Data Ctr, Rome, Italy

[25] London Stereoscop Co, London, England

来源：

NATURE ASTRONOMY | 2024年 / 8卷 / 04期

基金：

瑞士国家科学基金会; 欧盟地平线“2020”; 英国科学技术设施理事会;

关键词：

NUMERICAL SIMULATIONS; MOMENTUM-TRANSFER; STRENGTH; POROSITY;

D O I：

10.1038/s41550-024-02200-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

On 26 September 2022, NASA's Double Asteroid Redirection Test (DART) mission successfully impacted Dimorphos, the natural satellite of the binary near-Earth asteroid (65803) Didymos. Numerical simulations of the impact provide a means to find the surface material properties and structures of the target that are consistent with the observed momentum deflection efficiency, ejecta cone geometry and ejected mass. Our simulation that best matches the observations indicates that Dimorphos is weak, with a cohesive strength of less than a few pascals, like asteroids (162173) Ryugu and (101955) Bennu. We find that the bulk density of Dimorphos rho(B) is lower than similar to 2,400 kg m(-3) and that it has a low volume fraction of boulders (less than or similar to 40 vol%) on the surface and in the shallow subsurface, which are consistent with data measured by the DART experiment. These findings suggest that Dimorphos is a rubble pile that might have formed through rotational mass shedding and reaccumulation from Didymos. Our simulations indicate that the DART impact caused global deformation and resurfacing of Dimorphos. ESA's upcoming Hera mission may find a reshaped asteroid rather than a well-defined crater.

引用

页码：445 / 455

页数：21

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