{"title":"Age Estimation of Young Asteroid Pairs","authors":"V. S. Safronova, E. D. Kuznetsov","doi":"10.1134/s0038094624700473","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\n<b>Abstract</b>—</h3><p>In order to estimate the age, the work examined the probabilistic evolution of three young pairs of asteroids in close orbits: (87 887) 2000 SS286—(415 992) 2002 AT49, (320 025) 2007 DT76—(489 464) 2007 DP16, (21 436) Chaoyichi—(334 916) 2003 YK39. In the numerical simulation, along with gravitational disturbances, the Yarkovsky effect in the form of a secular drift of the orbital semimajor axis was taken into account. For each pair of asteroids, 25 evolution scenarios were considered, corresponding to different combinations of obliquities of the asteroids’ rotation axes and, correspondingly, different drift rates of the semimajor axes due to the Yarkovsky effect. For each asteroid, 1000 clones were generated. Age estimates were obtained based on analysis of moment distributions: (1) low relative-velocity close encounters of asteroids of pair to distances on the order of the Hill sphere at a relative speed of several units of the escape velocity and (2) achievement of minimum values of the Kholshevnikov metric, which characterizes the distance between orbits<i>.</i> The following age estimates for young asteroid pairs were obtained: (87 887) 2000 SS286 and (415 992) 2002 AT49 from 7.58 ± 0.04 to 8.80 ± 0.04 kyr; (320 025) 2007 DT76 and (489464) 2007 DP16 from 15.5 ± 1.0 to 58.6 ± 16.0 kyr; (21 436) Chaoyichi and (334 916) 2003 YK39 from 32.3 ± 0.1 to 102.6 ± 0.7 kyr.</p>","PeriodicalId":778,"journal":{"name":"Solar System Research","volume":null,"pages":null},"PeriodicalIF":0.6000,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solar System Research","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1134/s0038094624700473","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract—
In order to estimate the age, the work examined the probabilistic evolution of three young pairs of asteroids in close orbits: (87 887) 2000 SS286—(415 992) 2002 AT49, (320 025) 2007 DT76—(489 464) 2007 DP16, (21 436) Chaoyichi—(334 916) 2003 YK39. In the numerical simulation, along with gravitational disturbances, the Yarkovsky effect in the form of a secular drift of the orbital semimajor axis was taken into account. For each pair of asteroids, 25 evolution scenarios were considered, corresponding to different combinations of obliquities of the asteroids’ rotation axes and, correspondingly, different drift rates of the semimajor axes due to the Yarkovsky effect. For each asteroid, 1000 clones were generated. Age estimates were obtained based on analysis of moment distributions: (1) low relative-velocity close encounters of asteroids of pair to distances on the order of the Hill sphere at a relative speed of several units of the escape velocity and (2) achievement of minimum values of the Kholshevnikov metric, which characterizes the distance between orbits. The following age estimates for young asteroid pairs were obtained: (87 887) 2000 SS286 and (415 992) 2002 AT49 from 7.58 ± 0.04 to 8.80 ± 0.04 kyr; (320 025) 2007 DT76 and (489464) 2007 DP16 from 15.5 ± 1.0 to 58.6 ± 16.0 kyr; (21 436) Chaoyichi and (334 916) 2003 YK39 from 32.3 ± 0.1 to 102.6 ± 0.7 kyr.
期刊介绍：
Solar System Research publishes articles concerning the bodies of the Solar System, i.e., planets and their satellites, asteroids, comets, meteoric substances, and cosmic dust. The articles consider physics, dynamics and composition of these bodies, and techniques of their exploration. The journal addresses the problems of comparative planetology, physics of the planetary atmospheres and interiors, cosmochemistry, as well as planetary plasma environment and heliosphere, specifically those related to solar-planetary interactions. Attention is paid to studies of exoplanets and complex problems of the origin and evolution of planetary systems including the solar system, based on the results of astronomical observations, laboratory studies of meteorites, relevant theoretical approaches and mathematical modeling. Alongside with the original results of experimental and theoretical studies, the journal publishes scientific reviews in the field of planetary exploration, and notes on observational results.
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