最近发现的Annama H5球粒陨石的轨道和动力学起源
Orbit and dynamic origin of the recently recovered Annama's H5 chondrite
摘要：
我们描述了2014年4月19日（当地时间）发生在靠近芬兰边境的偏远科拉半岛（俄罗斯）的安娜玛陨石坠落事件。这颗火球是由芬兰火球网络（Finnish Fireball Network）观测到的。根据这些观测结果计算出了流场，并在2014年5月29日和5月30日发现了两颗距离预测着陆点仅几百米的陨石，因此陨石（H4-5球粒陨石）只经历了最小的陆地变化。观测的准确性使得能够获得精确的地心辐射，并计算出祖先流星体的日心轨道。对选定的近地小行星和安纳马流星体的轨道进行的反向积分表明，它们迅速偏离，因此安纳马陨石不太可能与它们有关。唯一的例外似乎是最近发现的2014 UR 116，它显示了一种合理的动态关系。相反，对流星体日心轨道的分析表明，安娜玛进入地球穿越阿波罗型轨道是通过与木星的4：1平均运动共振或nu 6长期共振发生的，这是迄今为止研究的大多数陨石进入地球的动力学机制。
英文摘要：
We describe the fall of Annama meteorite occurred in the remote Kola Peninsula (Russia) close to Finnish border on April 19, 2014 (local time). The fireball was instrumentally observed by the Finnish Fireball Network. From these observations the strewnfield was computed and two first meteorites were found only a few hundred meters from the predicted landing site on May 29th and May 30th 2014, so that the meteorite (an H4-5 chondrite) experienced only minimal terrestrial alteration. The accuracy of the observations allowed a precise geocentric radiant to be obtained, and the heliocentric orbit for the progenitor meteoroid to be calculated. Backward integrations of the orbits of selected near-Earth asteroids and the Annama meteoroid showed that they rapidly diverged so that the Annama meteorites are unlikely related to them. The only exception seems to be the recently discovered 2014UR116 that shows a plausible dynamic relationship. Instead, analysis of the heliocentric orbit of the meteoroid suggests that the delivery of Annama onto an Earth-crossing Apollo type orbit occurred via the 4:1 mean motion resonance with Jupiter or the nu6 secular resonance, dynamic mechanisms that are responsible for delivering to Earth most meteorites studied so far.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
