Meteorites from meteor showers: A case study of the Taurids
Meteorites from meteor showers: A case study of the Taurids
复制标题
流星雨中的陨石：金牛座流星雨的案例研究
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
W. Cooke
中科院分区：
文献类型：
--
作者：
P. Brown;V. Marchenko;D. Moser;R. Weryk;W. Cooke
我们认为金牛座流星雨可能包含能够幸存下来并作为陨石被回收的物体。我们回顾了产生陨石的火球的预期属性，并建议终点高度低于35 km，终点速度低于10 km s-1是火球产生陨石的必要条件。将Ceplecha和McCrosky（1976年）的流星体强度指数（PE标准）应用于一组33个经天文学记录的金牛座火球，我们发现流星体流内的流星体视强度分布很大，包括一些非常强的流星体。我们还详细研究了金牛座火球（SOMN 101031）的飞行行为，并表明它有可能成为一个（小）陨石产生事件。类似地，1995年11月在西班牙对一个明亮的、潜在的金牛座火球的摄影观测表明，它也具有陨石生成的特征，尽管它的进入速度非常高（33 km s−1）。最后，我们注意到，最近的马里博陨石坠落可能有一个非常高的进入速度（28 km s−1），进一步表明陨石在金牛座的速度是可能的。数值入口模型的应用也显示了流星在金牛座速度下的可能存活，前提是初始流星体相当强大和巨大，这两者都是金牛座流中发现的特征。
We propose that the Taurid meteor shower may contain bodies able to survive and be recovered as meteorites. We review the expected properties of meteorite‐producing fireballs, and suggest that end heights below 35 km and terminal speeds below 10 km s−1 are necessary conditions for fireballs expected to produce meteorites. Applying the meteoroid strength index (PE criteria) of Ceplecha and McCrosky (1976) to a suite of 33 photographically recorded Taurid fireballs, we find a large spread in the apparent meteoroid strengths within the stream, including some very strong meteoroids. We also examine in detail the flight behavior of a Taurid fireball (SOMN 101031) and show that it has the potential to be a (small) meteorite‐producing event. Similarly, photographic observations of a bright, potential Taurid fireball recorded in November of 1995 in Spain show that it also had meteorite‐producing characteristics, despite a very high entry velocity (33 km s−1). Finally, we note that the recent Maribo meteorite fall may have had a very high entry velocity (28 km s−1), further suggesting that survival of meteorites at Taurid‐like velocities is possible. Application of a numerical entry model also shows plausible survival of meteorites at Taurid‐like velocities, provided the initial meteoroids are fairly strong and large, both of which are characteristics found in the Taurid stream.