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The impact and recovery of asteroid 2018 LA

Jenniskens, Peter and Gabadirwe, Mohutsiwa and Yin, Qing‐Zhu and Proyer, Alexander and Moses, Oliver and Kohout, Tomas and Franchi, Fulvio and Gibson, Roger L. and Kowalski, Richard and Christensen, Eric J. and Gibbs, Alex R. and Heinze, Aren and Denneau, Larry and Farnocchia, Davide and Chodas, Paul W. and Gray, William and Micheli, Marco and Moskovitz, Nick and Onken, Christopher A. and Wolf, Christian and Devillepoix, Hadrien A. R. and Ye, Quanzhi and Robertson, Darrel K. and Brown, Peter and Lyytinen, Esko and Moilanen, Jarmo and Albers, Jim and Cooper, Tim and Assink, Jelle and Evers, Läslo and Lahtinen, Panu and Seitshiro, Lesedi and Laubenstein, Matthias and Wantlo, Nggie and Moleje, Phemo and Maritinkole, Joseph and Suhonen, Heikki and Zolensky, Michael E. and Ashwal, Lewis and Hiroi, Takahiro and Sears, Derek W. and Sehlke, Alexander and Maturilli, Alessandro and Sanborn, Matthew E. and Huyskens, Magdalena H. and Dey, Supratim and Ziegler, Karen and Busemann, Henner and Riebe, My E. I. and Meier, Matthias M. M. and Welten, Kees C. and Caffee, Marc W. and Zhou, Qin and Li, Qiu‐Li and Li, Xian‐Hua and Liu, Yu and Tang, Guo‐Qiang and McLain, Hannah L. and Dworkin, Jason P. and Glavin, Daniel P. and Schmitt‐Kopplin, Philippe and Sabbah, Hassan and Joblin, Christine and Granvik, Mikael and Mosarwa, Babutsi and Botepe, Koketso (2021) The impact and recovery of asteroid 2018 LA. Meteoritics and Planetary Science, 56 (4). pp. 844-893. ISSN 1086-9379. PMCID PMC7611328. doi:10.1111/maps.13653.

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The June 2, 2018 impact of asteroid 2018 LA over Botswana is only the second asteroid detected in space prior to impacting over land. Here, we report on the successful recovery of meteorites. Additional astrometric data refine the approach orbit and define the spin period and shape of the asteroid. Video observations of the fireball constrain the asteroid's position in its orbit and were used to triangulate the location of the fireball's main flare over the Central Kalahari Game Reserve. Twenty‐three meteorites were recovered. A consortium study of eight of these classifies Motopi Pan as an HED polymict breccia derived from howardite, cumulate and basaltic eucrite, and diogenite lithologies. Before impact, 2018 LA was a solid rock of ~156 cm diameter with high bulk density ~2.85 g cm⁻³, a relatively low albedo p_V ~ 0.25, no significant opposition effect on the asteroid brightness, and an impact kinetic energy of ~0.2 kt. The orbit of 2018 LA is consistent with an origin at Vesta (or its Vestoids) and delivery into an Earth‐impacting orbit via the ν₆ resonance. The impact that ejected 2018 LA in an orbit toward Earth occurred 22.8 ± 3.8 Ma ago. Zircons record a concordant U‐Pb age of 4563 ± 11 Ma and a consistent ²⁰⁷Pb/²⁰⁶Pb age of 4563 ± 6 Ma. A much younger Pb‐Pb phosphate resetting age of 4234 ± 41 Ma was found. From this impact chronology, we discuss what is the possible source crater of Motopi Pan and the age of Vesta's Veneneia impact basin.

Item Type:Article
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URLURL TypeDescription
Jenniskens, Peter0000-0003-4735-225X
Yin, Qing‐Zhu0000-0002-4445-5096
Kohout, Tomas0000-0003-4458-3650
Gibson, Roger L.0000-0002-0568-0063
Farnocchia, Davide0000-0003-0774-884X
Ye, Quanzhi0000-0002-4838-7676
Robertson, Darrel K.0000-0002-4534-1189
Brown, Peter0000-0001-6130-7039
Albers, Jim0000-0003-1321-2793
Laubenstein, Matthias0000-0001-5390-4343
Zolensky, Michael E.0000-0002-3181-1303
Hiroi, Takahiro0000-0003-2866-9091
Sears, Derek W.0000-0002-6630-2269
Sanborn, Matthew E.0000-0003-3218-1195
Ziegler, Karen0000-0002-7221-0803
Busemann, Henner0000-0002-0867-6908
Riebe, My E. I.0000-0002-2098-9587
Meier, Matthias M. M.0000-0002-7179-4173
Welten, Kees C.0000-0001-8577-6753
Caffee, Marc W.0000-0002-6846-8967
Zhou, Qin0000-0001-8562-9737
Li, Qiu‐Li0000-0002-7280-5508
Li, Xian‐Hua0000-0001-5512-7736
Liu, Yu0000-0001-7195-7393
Tang, Guo‐Qiang0000-0001-7754-9390
McLain, Hannah L.0000-0002-4306-4608
Dworkin, Jason P.0000-0002-3961-8997
Glavin, Daniel P.0000-0001-7779-7765
Schmitt‐Kopplin, Philippe0000-0003-0824-2664
Sabbah, Hassan0000-0001-5722-4388
Joblin, Christine0000-0003-1561-6118
Granvik, Mikael0000-0002-5624-1888
Additional Information:© The Meteoritical Society, 2021. Issue Online: 07 June 2021; Version of Record online: 23 April 2021; Manuscript accepted: 23 March 2021; Manuscript received: 22 January 2021. We thank the Department of Wildlife and National Parks in Botswana for park access and for Central Kalahari Game Reserve staff assistance during fieldwork. PJ and OM thank the Maun Lodge, Maun, Botswana, for assistance with measuring the meteor shadows. Robert D. Matson assisted EL. We thank Caiphas Majola for preparing the fragile samples in polished resin blocks, Alexander Ziegler for the EMP analyses, and Caitlin Stewart for the TIMA sample processing. This work was made possible by funding from the Botswana Geoscience Institute, and the Department of National Museum & Monuments in Botswana. SkyMapper was funded through ARC LIEF grant LE130100104 from the Australian Research Council. TK acknowledges support by the Academy of Finland (project nos. 293975 and 335595) and institutional support RVO 67985831 of the Institute of Geology of the Czech Academy of Sciences. LE is supported by the Dutch Research Council (NWO VIDI project 864.14.005). QZ acknowledges support from the National Natural Science Foundation of China (project 41403055). MEIR and HB thank the Swiss National Science Foundation for support through the framework of the NCCR “PlanetS.” HS and JB acknowledge support from the European Research Council (FP7) ERC‐2013‐SyG, G.A. N°610256 NANOCOSMOS. Thermal emissivity measurements have been performed by AM, FF, and TK with the support of Europlanet. Europlanet 2020 RI has received funding from the European Union's Horizon 2020 research and innovation programme (No 654208). Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration (80NM0018D0004). Several authors acknowledge support from NASA, NASA’s Planetary Defense Coordination Office, and the NASA SSERVI Center for Asteroid and Lunar Surface Science (CLASS). JPD, DPG, and HLM acknowledge a grant from the Simons Foundation (SCOL award 302497 to JPD) and support from the NASA Astrobiology Institute and the Goddard Center for Astrobiology. MEZ and QZY acknowledge support from the NASA Emerging Worlds Program (NNX16AD34G). MEZ also acknowledges support from the Hayabusa2 Program. PJ acknowledges support from the NASA NEOO program (NNX14‐AR92G) and the SSO program (80NSSC18K0854). Data Availability Statement: The data that support the findings of this study are available from the relevant authors upon reasonable request.
Funding AgencyGrant Number
Botswana Geoscience InstituteUNSPECIFIED
Department of National Museum & Monuments (Botswana)UNSPECIFIED
Australian Research CouncilLE130100104
Academy of Finland293975
Academy of Finland335595
Czech Academy of SciencesRVO 67985831
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)864.14.005
National Natural Science Foundation of China41403055
Swiss National Science Foundation (SNSF)UNSPECIFIED
European Research Council (ERC)610256
European Research Council (ERC)654208
Simons Foundation302497
Japan Aerospace Exploration Agency (JAXA)UNSPECIFIED
Issue or Number:4
PubMed Central ID:PMC7611328
Record Number:CaltechAUTHORS:20210504-121551953
Persistent URL:
Official Citation:Jenniskens, P., Gabadirwe, M., Yin, Q.-Z., Proyer, A., Moses, O., Kohout, T., Franchi, F., Gibson, R.L., Kowalski, R., Christensen, E.J., Gibbs, A.R., Heinze, A., Denneau, L., Farnocchia, D., Chodas, P.W., Gray, W., Micheli, M., Moskovitz, N., Onken, C.A., Wolf, C., Devillepoix, H.A.R., Ye, Q., Robertson, D.K., Brown, P., Lyytinen, E., Moilanen, J., Albers, J., Cooper, T., Assink, J., Evers, L., Lahtinen, P., Seitshiro, L., Laubenstein, M., Wantlo, N., Moleje, P., Maritinkole, J., Suhonen, H., Zolensky, M.E., Ashwal, L., Hiroi, T., Sears, D.W., Sehlke, A., Maturilli, A., Sanborn, M.E., Huyskens, M.H., Dey, S., Ziegler, K., Busemann, H., Riebe, M.E.I., Meier, M.M.M., Welten, K.C., Caffee, M.W., Zhou, Q., Li, Q.-L., Li, X.-H., Liu, Y., Tang, G.-Q., McLain, H.L., Dworkin, J.P., Glavin, D.P., Schmitt-Kopplin, P., Sabbah, H., Joblin, C., Granvik, M., Mosarwa, B. and Botepe, K. (2021), The impact and recovery of asteroid 2018 LA. Meteorit Planet Sci, 56: 844-893.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108964
Deposited By: Tony Diaz
Deposited On:05 May 2021 18:47
Last Modified:26 Jul 2021 19:07

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