The Dingle Dell meteorite: A Halloween treat from the Main Belt |
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| Authors: | Hadrien A R Devillepoix Eleanor K Sansom Philip A Bland Martin C Towner Martin Cupák Robert M Howie Trent Jansen-Sturgeon Morgan A Cox Benjamin A D Hartig Gretchen K Benedix Jonathan P Paxman |
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| Institution: | 1. School of Earth and Planetary Sciences, Curtin University, Bentley, WA, 6102 Australia;2. School of Civil and Mechanical Engineering, Curtin University, Bentley, WA, 6102 Australia |
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| Abstract: | 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 30 cm meteoroid entered at 15.44 km s?1, followed a moderately steep trajectory of 51° to the horizon from 81 km down to 19 km altitude, where the luminous flight ended at a speed of 3.2 km s?1. Deceleration data indicated one large fragment had made it to the ground. The four person search team recovered a 1.15 kg meteorite within 130 m of the predicted fall line, after 8 h of searching, 6 days 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 1 Ma, 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 ν6 resonance. This makes the connection of Dingle Dell to the Flora family (currently thought to be the origin of LL chondrites) unlikely. |
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