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|Title:||A numerical approach to study ablation of large bolides: Application to Chelyabinsk|
|Authors:||Trigo-Rodríguez, J. M.|
Silber, E. A.
Williams, I. P.
|Citation:||A numerical approach to study ablation of large bolides: Application to Chelyabinsk / J. M. Trigo-Rodríguez, J. Dergham, M. Gritsevich, et al. — DOI 10.1155/2021/8852772 // Advances in Astronomy. — 2021. — Vol. 2021. — 8852772.|
|Abstract:||In this study, we investigate the ablation properties of bolides capable of producing meteorites. The casual dashcam recordings from many locations of the Chelyabinsk superbolide associated with the atmospheric entry of an 18 m in diameter near-Earth object (NEO) have provided an excellent opportunity to reconstruct its atmospheric trajectory, deceleration, and heliocentric orbit. In this study, we focus on the study of the ablation properties of the Chelyabinsk bolide on the basis of its deceleration and fragmentation. We explore whether meteoroids exhibiting abrupt fragmentation can be studied by analyzing segments of the trajectory that do not include a disruption episode. We apply that approach to the lower part of the trajectory of the Chelyabinsk bolide to demonstrate that the obtained parameters are consistent. To do that, we implemented a numerical (Runge–Kutta) method appropriate for deriving the ablation properties of bolides based on observations. The method was successfully tested with the cases previously published in the literature. Our model yields fits that agree with observations reasonably well. It also produces a good fit to the main observed characteristics of Chelyabinsk superbolide and provides its averaged ablation coefficient σ = 0.034 s2 km-2. Our study also explores the main implications for impact hazard, concluding that tens of meters in diameter NEOs encountering the Earth in grazing trajectories and exhibiting low geocentric velocities are penetrating deeper into the atmosphere than previously thought and, as such, are capable of producing meteorites and even damage on the ground. Copyright © 2021 Josep M. Trigo-Rodríguez et al.|
|metadata.dc.description.sponsorship:||his research was funded by the research project (PGC2018-097374-B-I00, P.I. J.M.T-R), funded by FEDER/Ministerio de Ciencia e Innovaci?n?Agencia Estatal de Investigaci?n. MG acknowledges support from the Academy of Finland (325806). Research at the Ural Federal University was supported by the Russian Foundation for Basic Research (18-08-00074 and 19-05-00028). During the peer-review of this manuscript, the authors lost a mastermind, dear friend, and the co-author Esko Lyytinen. The authors dedicate this common effort in memorial to his enormous science figure and also to his friendship, insight, and understanding shared over the years. The authors thank Dr. Oleksandr Girin and two anonymous reviewers for their valuable and constructive comments. The authors also thank Marat Ahmetvaleev for providing them with the amazing pictures of the Chelyabinsk bolide and its dust trail.|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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