The Kosice meteorite fall: Atmospheric trajectory, fragmentation, and orbit
The Kosice meteorite fall: Atmospheric trajectory, fragmentation, and orbit
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DOI：
10.1111/maps.12078
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发表时间：
2013-10-01
影响因子：
2.2
通讯作者：
Husarik, Marek
中科院分区：
文献类型：
--
作者：
Borovicka, Jiri;Toth, Juraj;Husarik, Marek
2010年2月28日，22：25 UT，斯洛伐克东部的Koice陨石坠落。这颗非常明亮的火流星是由匈牙利的三台安全摄像机拍摄的。详细的火流星光变曲线是通过欧洲火球网络的七台照相机上的辐射计穿过云层获得的。在六个地震台站和四个次声台站上发现了声波记录。次日早晨日出前观测到大气尘云。经过仔细的校准，视频记录被用来计算火流星的轨迹和速度。这颗质量估计为3500公斤的流星体以15公里（-1）的速度进入大气层，其轨道与水平线成60度角。最大的碎片在17公里的高度消失，并减速到4.5公里（-1）。在36公里的高度达到绝对星等的最大亮度，约为-18等。我们开发了一个详细的流星体大气层碎裂模型，以拟合观测到的光变曲线和减速。结果表明，Koice是一个弱流星体，在动压为0.1MPa时开始碎裂，在动压为1 MPa时碎裂严重。在官方搜索期间，在预测的坠落区域总共发现了78颗陨石。其他陨石是由私人收藏家发现的。已知的陨石质量从0.56克到2.37公斤不等。这些陨石被归类为H5型和S3级的普通陨石。日心轨道的半长轴相对较大，为2.7天文单位，远日点距离为4.5 +/-0.5天文单位。撞击前轨道的向后数值积分表明，由于与木星的共振，过去的轨道要素可能会有很大的变化。
The Koice meteorite fall occurred in eastern Slovakia on February 28, 2010, 22:25 UT. The very bright bolide was imaged by three security video cameras from Hungary. Detailed bolide light curves were obtained through clouds by radiometers on seven cameras of the European Fireball Network. Records of sonic waves were found on six seismic and four infrasonic stations. An atmospheric dust cloud was observed the next morning before sunrise. After careful calibration, the video records were used to compute the bolide trajectory and velocity. The meteoroid, of estimated mass of 3500kg, entered the atmosphere with a velocity of 15kms(-1) on a trajectory with a slope of 60 degrees to the horizontal. The largest fragment ceased to be visible at a height of 17km, where it was decelerated to 4.5kms(-1). A maximum brightness of absolute stellar magnitude about -18 was reached at a height of 36km. We developed a detailed model of meteoroid atmospheric fragmentation to fit the observed light curve and deceleration. We found that Koice was a weak meteoroid, which started to fragment under the dynamic pressure of only 0.1MPa and fragmented heavily under 1MPa. In total, 78 meteorites were recovered in the predicted fall area during official searches. Other meteorites were found by private collectors. Known meteorite masses ranged from 0.56g to 2.37kg. The meteorites were classified as ordinary chondrites of type H5 and shock stage S3. The heliocentric orbit had a relatively large semimajor axis of 2.7AU and aphelion distance of 4.5 +/- 0.5AU. Backward numerical integration of the preimpact orbit indicates possible large variations of the orbital elements in the past due to resonances with Jupiter.