Dimorphos's Material Properties and Estimates of Crater Size from the DART Impact

被引：2

作者：

Stickle, Angela M. ^{[1
]}

Kumamoto, Kathryn M. ^{[2
]}

Graninger, Dawn M. ^{[1
]}

Decoster, Mallory E. ^{[1
]}

Caldwell, Wendy K. ^{[3
]}

Pearl, Jason M. ^{[2
]}

Owen, J. Michael ^{[2
]}

Barnouin, Olivier ^{[1
]}

Collins, Gareth S. ^{[4
]}

Daly, R. Terik ^{[1
]}

Herreros, Isabel ^{[5
]}

Ormo, Jens ^{[5
]}

Sunshine, Jessica ^{[6
]}

Ernst, Carolyn M. ^{[1
]}

Hirabayashi, Toshi ^{[7
]}

Marchi, Simone ^{[8
]}

Parro, Laura ^{[9
]}

Agrusa, Harrison ^{[6
,10
]}

Syal, Megan Bruck

Chabot, Nancy L. ^{[2
]}

Cheng, Andy F. ^{[1
]}

Davison, Thomas M. ^{[4
]}

Dotto, Elisabetta ^{[11
]}

Fahenstock, Eugene G. ^{[12
]}

Ferrari, Fabio ^{[13
]}

Jutzi, Martin ^{[14
]}

Lucchetti, Alice ^{[15
]}

Luther, Robert ^{[16
]}

Mitra, Nilanjan ^{[17
]}

Pajola, Maurizio ^{[15
]}

Raducan, Sabina ^{[14
]}

Ramesh, Kt ^{[17
]}

Rivkin, Andrew S. ^{[1
]}

Rossi, Alessandro ^{[18
]}

Sanchez, Paul ^{[19
]}

Schwartz, Stephen R. ^{[20
]}

Soldini, Stefania ^{[21
]}

Steckloff, Jordan K. ^{[20
]}

Tusberti, Filippo ^{[15
]}

Wuennemann, Kai ^{[16
]}

Zhang, Yun ^{[6
]}

机构：

[1] Johns Hopkins Appl Phys Lab, 11100 Johns Hopkins Rd, Laurel, MD 20723 USA

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

[3] Los Alamos Natl Lab, Los Alamos, NM USA

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

[5] Ctr Astrobiol CAB CSIC INTA, Carretera Ajalvir Km4, Torrejon De Ardoz 28850, Spain

[6] Univ Maryland, College Pk, MD USA

[7] Georgia Inst Technol, Daniel Guggenheim Sch Aerosp Engn, Atlanta, GA 30332 USA

[8] Southwest Res Inst, Boulder, CO USA

[9] Univ Alicante, Alicante, Spain

[10] Ctr Natl Rech Sci, CNRS, Aubervilliers, France

[11] INAF, I-00040 Pomezia, Italy

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

[13] Politecn Milan, Dept Aerosp Sci & Technol, I-20159 Milan, Italy

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

[15] INAF Osservatorio Astron Padova, Padua, Italy

[16] Leibniz Inst Evolut & Biodiversitatsforsch, Museum Nat Kunde, Berlin, Germany

[17] Ohns Hopkins Univ, Jhpiego, Baltimore, MO USA

[18] Ist Fis Applicata Nello Carrara IFAC CNR, Belluno, Italy

[19] Univ Colorado, Boulder, CO USA

[20] Planetary Sci Inst, Tucson, AZ USA

[21] Univ Liverpool, Liverpool L69 3GH, England

来源：

PLANETARY SCIENCE JOURNAL | 2025年 / 6卷 / 02期

关键词：

MOMENTUM-TRANSFER; CTH; DEFLECTION; STRENGTH; FRACTURE; SIMULATIONS; COMPACTION; FRICTION; EQUATION; POROSITY;

D O I：

10.3847/PSJ/ad944d

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

On 2022 September 26, the Double Asteroid Redirection Test (DART) spacecraft intentionally collided with Dimorphos, the moon of the binary asteroid system 65803 Didymos. This collision provided the first full-scale test of a kinetic impactor for planetary defense. Images from DART's DRACO camera revealed Dimorphos to be an oblate spheroid covered in boulders of varying sizes and shapes. Very little was known about Dimorphos prior to DART's impact, including its shape, structure, and material properties. Approach observations and those following the DART impact have provided crucial knowledge that narrows the parameter space relevant to modeling the impact into Dimorphos. Here we present the results of a suite of hydrocode simulations of the DART impact on Dimorphos. Despite remaining uncertainties, initial models of DART's kinetic impact provide important information about the results of DART (e.g., potential crater size and morphology, ejecta mass) and the properties of Dimorphos. Simulations here suggest that Dimorphos has near-surface strength ranging from a few Pascals to tens of kPa, which corresponds to crater sizes of similar to 40-60 m. Simulated crater sizes provide a crucial comparison metric for the European Space Agency Hera mission when it arrives at the Didymos system. Hera's measurement of crater size in combination with measurement of Dimorphos's mass will allow us to assess our simulations and provide the information needed to make the DART impact experiment both the first test of a planetary defense mitigation mission and the first full-scale planetary defense simulation validation exercise.

引用

页数：27

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