北京时间2019年10月11日,一颗流星在我国吉林松原附近进入大气层。本文首先分析了NASA CNEOS网站数据、现场视频以及陨石搜寻结果等观测数据,然后利用项目组建立的小行星进入与撞击效应分析评估软件AICA,计算分析了流星进入大气过程及对地面的影响,得到对流星母体结构的合理推测。本文的计算分析指出,松原流星的母体质量约为2.4t,是具有碎石堆结构的石质小行星;流星进入大气过程中,在69.8km高度初次解体,在47.3km高度发生主空爆,随后又发生了若干次小空爆,在30km高度以上所有大尺寸碎片都通过解体或烧蚀的方式消耗完质量,没有大尺寸陨石降落到地面;流星进入大气的冲击波和热辐射效应较小,不会对地面人员和实施造成损伤。
A meteoroid entered into Earth's atmosphere near Songyuan,Jilin Province,on November 11,2019 Beijing time.Firstly,observation data is analyzed including data at NASA CNEOS website,and on-site video and meteorite search results.Then entry process and influence on ground of Songyuan meteoroid are computed and analyzed by AICA code(Asteroid Impact Consequence Analysis)developed by authors of this paper.Parent body's structure of the meteoroid are also inferred.It is indicated from the results that the parent body of the meteoroid is a stony asteroid with rubble pile structure and has a mass of about 2.4 tons.The meteoroid broke up at altitude of 69.8km,with main airburst at altitude of 47.3km and secondary airbursts in the subsequent entry process.Large scale fragments were all disintegrated or ablated,and no large scale meteorite fell onto ground.The hazard effects caused by shock wave and heat radiation in entry process was too little to be harmful to population and facilities.
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