The Dingle Dell meteorite: A Halloween treat from the Main Belt
The Dingle Dell meteorite: A Halloween treat from the Main Belt
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DOI：
10.1111/maps.13142
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发表时间：
2018-10-01
影响因子：
2.2
通讯作者：
Paxman, Jonathan P.
中科院分区：
文献类型：
--
作者：
Devillepoix, Hadrien A. R.;Sansom, Eleanor K.;Paxman, Jonathan P.
我们描述了2016年10月31日在西澳大利亚州莫拉瓦附近的丁格尔戴尔（L/LL 5）陨石的坠落。沙漠火球网络（DFN）的六个观测站观测到了火球，DFN是一个大陆规模的设施，用于回收陨石并计算它们的进入前轨道。这颗直径30厘米的流星体以15.44公里（-1）的速度进入，从81公里到19公里的高度，沿着51度的适度陡峭轨道飞行，最终以3.2公里（-1）的速度结束了明亮的飞行。减速数据显示，一个大的碎片已经到达地面。四人搜寻小组在预测的坠落线130米范围内，经过8小时的搜寻，在坠落后6天内找到了一块1.15公斤重的陨石。丁格尔戴尔是DFN在澳大利亚发现的第四颗陨石，但这是第一颗在下雨之前就污染了样本的陨石。通过对1 Ma的数值积分，我们发现丁格尔戴尔极有可能是由于与木星的3：1平均运动共振而从主带中被弹射出来的，只有很小的可能性来自（6）共振。这使得丁格尔戴尔与植物群家族（目前被认为是LL植物群的起源）的联系不太可能。
We describe the fall of the Dingle Dell (L/LL 5) meteorite near Morawa in Western Australia on October 31, 2016. The fireball was observed by six observatories of the Desert Fireball Network (DFN), a continental-scale facility optimized to recover meteorites and calculate their pre-entry orbits. The 30cm meteoroid entered at 15.44kms(-1), followed a moderately steep trajectory of 51 degrees to the horizon from 81km down to 19km altitude, where the luminous flight ended at a speed of 3.2kms(-1). Deceleration data indicated one large fragment had made it to the ground. The four person search team recovered a 1.15kg meteorite within 130m of the predicted fall line, after 8h of searching, 6days after the fall. Dingle Dell is the fourth meteorite recovered by the DFN in Australia, but the first before any rain had contaminated the sample. By numerical integration over 1Ma, we show that Dingle Dell was most likely ejected from the Main Belt by the 3:1 mean motion resonance with Jupiter, with only a marginal chance that it came from the (6) resonance. This makes the connection of Dingle Dell to the Flora family (currently thought to be the origin of LL chondrites) unlikely.