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Video observations, atmospheric path, orbit and fragmentation record of the fall of the Peekskill meteorite.
Earth, Moon, and Planets ( IF 0.7 ) Pub Date : 1996-02-01 , DOI: 10.1007/bf00117543
Z Ceplecha 1 , P Brown , R L Hawkes , G Wetherill , M Beech , K Mossman
Affiliation  

Large Near-Earth-Asteroids have played a role in modifying the character of the surface geology of the Earth over long time scales through impacts. Recent modeling of the disruption of large meteoroids during atmospheric flight has emphasized the dramatic effects that smaller objects may also have on the Earth's surface. However, comparison of these models with observations has not been possible until now. Peekskill is only the fourth meteorite to have been recovered for which detailed and precise data exist on the meteoroid atmospheric trajectory and orbit. Consequently, there are few constraints on the position of meteorites in the solar system before impact on Earth. In this paper, the preliminary analysis based on 4 from all 15 video recordings of the fireball of October 9, 1992 which resulted in the fall of a 12.4 kg ordinary chondrite (H6 monomict breccia) in Peekskill, New York, will be given. Preliminary computations revealed that the Peekskill fireball was an Earth-grazing event, the third such case with precise data available. The body with an initial mass of the order of 10(4) kg was in a pre-collision orbit with a = 1.5 AU, an aphelion of slightly over 2 AU and an inclination of 5 degrees. The no-atmosphere geocentric trajectory would have lead to a perigee of 22 km above the Earth's surface, but the body never reached this point due to tremendous fragmentation and other forms of ablation. The dark flight of the recovered meteorite started from a height of 30 km, when the velocity dropped below 3 km/s, and the body continued 50 km more without ablation, until it hit a parked car in Peekskill, New York with a velocity of about 80 m/s. Our observations are the first video records of a bright fireball and the first motion pictures of a fireball with an associated meteorite fall.

中文翻译:

皮克斯基陨石坠落的视频观测,大气路径,轨道和碎片记录。

大型近地小行星通过撞击在长期尺度上改变了地球表面地质特征。最近关于大气中大流星体破坏的模型表明,较小的物体也可能对地球表面产生巨大的影响。但是,到目前为止,尚无法将这些模型与观察结果进行比较。皮克斯基尔(Peekskill)只是已被回收的第四颗陨石,有关该陨石的详细信息和精确数据存在于流星体的大气轨迹和轨道上。因此,在撞击地球之前,对陨石在太阳系中的位置几乎没有任何限制。本文基于1992年10月9日火球的所有15个视频记录中的4个进行了初步分析,结果导致12个视频记录的下降。将提供4公斤在纽约州皮克斯基尔(Peekskill)的普通球粒陨石(H6微型角砾岩)。初步计算显示,Peekskill火球是一次放牧地球的事件,第三个此类事件具有精确的数据。初始质量为10(4)kg量级的物体处于碰撞前轨道,其中a = 1.5 AU,顶针略高于2 AU,倾斜度为5度。没有大气层的地心轨迹将导致近地点接近地球表面22公里,但由于巨大的碎片和其他形式的烧蚀,人体从未达到这一点。回收的陨石的黑暗飞行从30 km的高度开始,当速度降至3 km / s以下时,身体继续消融50 km以上,直到它撞到位于纽约Peekskill的停放的汽车上,速度为约80 m / s。
更新日期:2019-11-01
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