The Dingle Dell meteorite: A Halloween treat from the Main Belt

Devillepoix, Hadrien A. R.; Sansom, Eleanor K.; Bland, P. A.; Towner, M. C.; Cupák, Martin; Howie, Robert M.; Jansen‐Sturgeon, Trent; Cox, M. A.; Hartig, Benjamin A. D.; Benedix, Gretchen; Paxman, Jonathan

doi:10.1111/maps.13142

Cited by 36 publications

(33 citation statements)

References 47 publications

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“…The Desert Fireball Network uses the modulation of a liquid crystal shutter within the lens of each camera to encode a unique time sequence into the fireball's path (Howie et al, 2017). By comparing the position of the start and end of each fireball segment with the background stars, the azimuth and elevation of each time encoded data point can be determined (Devillepoix et al, 2018).…”

Section: Line-of-sight Measurement Updatementioning

confidence: 99%

3D meteoroid trajectories

Sansom

Jansen‐Sturgeon

Rutten

et al. 2019

Icarus

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Meteoroid modelling of fireball data typically uses a one dimensional model along a straight line triangulated trajectory. The assumption of a straight line trajectory has been considered an acceptable simplification for fireballs, but it has not been rigorously tested. The unique capability of the Desert Fireball Network (DFN) to triangulate discrete observation times gives the opportunity to investigate the deviation of a meteoroid's position to different model fits. Here we assess the viability of a straight line assumption for fireball data in two meteorite-dropping test cases observed by the Desert Fireball Network (DFN) in Australia -one over 21 seconds (DN151212 03 ), one under 5 seconds (DN160410 03 ). We show that a straight line is not valid for these two meteorite dropping events and propose a three dimensional particle filter to model meteoroid positions without any straight line constraints. The single body equations in three dimensions, along with the luminosity equation, are applied to the particle filter methodology described by . Modelling fireball camera network data in three dimensions has not previously been attempted. This allows the raw astrometric, line-of-sight observations to be incorporated directly. In analysing these two DFN events, the triangulated positions based on a straight line assumption result in the modelled meteoroid positions diverging up to 3.09 km from the calculated observed point (for DN151212 03 ). Even for the more typical fireball event, DN160410 03, we see a divergence of up to 360 m. As DFN observations are typically precise to < 100 m, it is apparent that the assumption of a straight line is an oversimplification that will affect orbit calculations and meteorite search regions for a significant fraction of events.

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Section: Line-of-sight Measurement Updatementioning

confidence: 99%

3D meteoroid trajectories

Sansom

Jansen‐Sturgeon

Rutten

et al. 2019

Icarus

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“…; Devillepoix et al. ; Granvik and Brown ) with at least seven more having sufficient data for orbit determination but not yet published. Among these are 13 H chondrites with measured orbits, by far the largest of any meteorite group.…”

Section: Introductionmentioning

confidence: 99%

The Hamburg meteorite fall: Fireball trajectory, orbit, and dynamics

Brown

Vida

Moser

et al. 2019

Meteorit & Planetary Scien

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The Hamburg (H4) meteorite fell on 17 January 2018 at 01:08 UT approximately 10 km north of Ann Arbor, Michigan. More than two dozen fragments totaling under 1 kg were recovered, primarily from frozen lake surfaces. The fireball initial velocity was 15.83 ± 0.05 km s−1, based on four independent records showing the fireball above 50 km altitude. The radiant had a zenith angle of 66.14 ± 0.29° and an azimuth of 121.56 ± 1.2°. The resulting low inclination (<1°) Apollo‐type orbit has a large aphelion distance and Tisserand value relative to Jupiter (Tj) of ~3. Two major flares dominate the energy deposition profile, centered at 24.1 and 21.7 km altitude, respectively, under dynamic pressures of 5–7 MPa. The Geostationary Lightning Mapper on the Geostationary Operational Environmental Satellite‐16 also detected the two main flares and their relative timing and peak flux agree with the video‐derived brightness profile. Our preferred total energy for the Hamburg fireball is 2–7 T TNT (8.4–28 × 109 J), which corresponds to a likely initial mass in the range of 60–225 kg or diameter between 0.3 and 0.5 m. Based on the model of Granvik et al. (2018), the meteorite originated in an escape route from the mid to outer asteroid belt. Hamburg is the 14th known H chondrite with an instrumentally derived preatmospheric orbit, half of which have small (<5°) inclinations making connection with (6) Hebe problematic. A definitive parent body consistent with all 14 known H chondrite orbits remains elusive.

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“…Open circle is L/ LL Dingle‐Dell (Devillepoix et al. ). (Color figure can be viewed at wileyonlinelibrary.com.…”

Section: Discussionmentioning

confidence: 99%

“…; Devillepoix et al. ). The L/LL group is chemically distinct from LL chondrites (e.g., Friedrich and Lipschutz ).…”

Section: Introductionmentioning

confidence: 97%

Orbit and origin of theLL7 chondrite Dishchii'bikoh (Arizona)

Jenniskens

Moskovitz

Garvie

et al. 2020

Meteorit & Planetary Scien

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The trajectory and orbit of the LL7 ordinary chondrite Dishchii'bikoh are derived from low-light video observations of a fireball first detected at 10:56:26 UTC on June 2, 2016. Results show a relatively steep~21°inclined orbit and a short 1.13 AU semimajor axis. Following entry in Earth's atmosphere, the meteor luminosity oscillated corresponding to a meteoroid spin rate of 2.28 AE 0.02 rotations per second. A large fragment broke off at 44 km altitude. Further down, mass was lost to dust during flares at altitudes of 34, 29, and 25 km. Surviving meteorites were detected by Doppler weather radar and several small 0.9-29 g meteorites were recovered under the radar reflection footprint. Based on cosmogenic radionuclides and ground-based radiometric observations, the Dishchii'bikoh meteoroid was 80 AE 20 cm in diameter assuming the density was 3.5 g/cm 3 . The meteoroid's collisional history confirms that the unusual petrologic class of LL7 does not require a different parent body than three previously observed LL chondrite falls. Dishchii'bikoh was ejected 11 Ma ago from parent body material that has a 4471 AE 6 Ma U-Pb age, the same as that of Chelyabinsk (4452 AE 21 Ma). The distribution of the four known pre-impact LL chondrite orbits is best matched by dynamical modeling if the source of LL chondrites is in the inner asteroid belt in a low inclined orbit, with the highly inclined Dishchii'bikoh being the result of interactions with Earth before impacting.

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The Dingle Dell meteorite: A Halloween treat from the Main Belt

Cited by 36 publications

References 47 publications

3D meteoroid trajectories

3D meteoroid trajectories

The Hamburg meteorite fall: Fireball trajectory, orbit, and dynamics

Orbit and origin of theLL7 chondrite Dishchii'bikoh (Arizona)

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