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The Dingle Dell meteorite: a Halloween treat from the Main Belt | | 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
; | | Date: |
7 Mar 2018 | | 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 optimised to recover meteorites and calculate their pre-entry orbits.
The $30,mbox{cm}$ meteoroid entered at 15.44 $mbox{km s}^{-1}$, followed a
moderately steep trajectory of $51^{circ}$ to the horizon from 81 km down to
19 km altitude, where the luminous flight ended at a speed of 3.2 $mbox{km
s}^{-1}$. 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 hours 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 $nu_6$ resonance. This makes the connection of Dingle Dell to
the Flora family (currently thought to be the origin of LL chondrites)
unlikely. | | Source: | arXiv, 1803.2557 | | Services: | Forum | Review | PDF | Favorites | |
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