The UK Fireball Alliance (UKFAll); combining and integrating the diversity of UK camera networks to aim to recover the first UK meteorite fall for 30 years

Daly, Luke; McMullan, Sarah; Rowe, Jim; Collins, G. S.; Suttle, M. D.; Chan, Q. H. S.; Young, John S.; Shaw, Clive; Mardon, A.G.; Alexander, Mike; Tate, Jonathan; Campbell‐Burns, Peter; Kacerek, Richard; King, Ashley; Joy, Katherine H.; Christou, Apostolos; Horák, Jana; Shepherd, Jamie

doi:10.5194/epsc2020-705

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…The CM2 Winchcombe meteorite fell at 9:54 p.m. on February 28, 2021 in Gloucestershire in the United Kingdom and was recovered over the next week as described in King et al (2022). Critically, the meteorite fireball was observed by the meteoroid camera networks in the United Kingdom (UKFAll; Daly et al, 2020); UKFN/ GFO (Devillepoix et al, 2020); UKMON (Campbell-Burns & Kacerek, 2014); NEMETODE (Stewart et al, 2013); SCAMP/FRIPON (Colas et al, 2012); GMN (Vida et al, 2021); AllSky7 (Hankey et al, 2020) providing an accurate orbit and a predicted fall ellipse (McMullan et al, 2022). Furthermore, the fireball was recorded on security and dashcam videos, owing to its fall over a densely populated area, providing a record of the visible phenomena occurring during the event.…”

Section: Introductionmentioning

confidence: 99%

The fusion crust of the Winchcombe meteorite: A preserved record of atmospheric entry processes

Genge

Alesbrook

Almeida

et al. 2023

Meteorit & Planetary Scien

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Fusion crusts form during the atmospheric entry heating of meteorites and preserve a record of the conditions that occurred during deceleration in the atmosphere. The fusion crust of the Winchcombe meteorite closely resembles that of other stony meteorites, and in particular CM2 chondrites, since it is dominated by olivine phenocrysts set in a glassy mesostasis with magnetite, and is highly vesicular. Dehydration cracks are unusually abundant in Winchcombe. Failure of this weak layer is an additional ablation mechanism to produce large numbers of particles during deceleration, consistent with the observation of pulses of plasma in videos of the Winchcombe fireball. Calving events might provide an observable phenomenon related to meteorites that are particularly susceptible to

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Section: Introductionmentioning

confidence: 99%

The fusion crust of the Winchcombe meteorite: A preserved record of atmospheric entry processes

Genge

Alesbrook

Almeida

et al. 2023

Meteorit & Planetary Scien

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“…The details of cameras that observed the fireball are given in Table 1. All networks which contributed optical observations are part of the UK Fireball Alliance (https://www.ukfall.org.uk/; Daly et al., 2020). Figure 1 shows the image of the fireball from several cameras.…”

Section: Methodsmentioning

confidence: 99%

“…The UKFAll consortium was established in 2018 as a collaboration between the five meteor camera networks in the UK, with an aim to streamline data sharing and meteorite recovery efforts (Daly et al., 2020). The precursory work that UKFAll had done prior to this event enabled the team to share data, establish an initial strewn field, and handle press inquiries, all within 12 h of the fall.…”

Section: Introductionmentioning

confidence: 99%

The Winchcombe fireball—That lucky survivor

McMullan

Vida

Devillepoix

et al. 2023

Meteorit & Planetary Scien

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On February 28, 2021, a fireball dropped ∼0.6 kg of recovered CM2 carbonaceous chondrite meteorites in South‐West England near the town of Winchcombe. We reconstruct the fireball's atmospheric trajectory, light curve, fragmentation behavior, and pre‐atmospheric orbit from optical records contributed by five networks. The progenitor meteoroid was three orders of magnitude less massive (∼13 kg) than any previously observed carbonaceous fall. The Winchcombe meteorite survived entry because it was exposed to a very low peak atmospheric dynamic pressure (∼0.6 MPa) due to a fortuitous combination of entry parameters, notably low velocity (13.9 km s−1). A near‐catastrophic fragmentation at ∼0.07 MPa points to the body's fragility. Low entry speeds which cause low peak dynamic pressures are likely necessary conditions for a small carbonaceous meteoroid to survive atmospheric entry, strongly constraining the radiant direction to the general antapex direction. Orbital integrations show that the meteoroid was injected into the near‐Earth region ∼0.08 Myr ago and it never had a perihelion distance smaller than ∼0.7 AU, while other CM2 meteorites with known orbits approached the Sun closer (∼0.5 AU) and were heated to at least 100 K higher temperatures.

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“…In the area of site testing, wide-angle imaging can be used for the measurement of cloud coverage and night-sky brightness (e.g., Mandat et al 2013;Pascual et al 2017;Hänel et al 2018), which is a significant problem not only for active observatories but also for the candidate sites of future observatories (Schöck et al 2009;Thomas-Osip et al 2010). In the field of meteor astronomy, positional astrometric reduction can be used to calculate the initial orbit of the meteoroid and predict the final fall position, which can improve the efficiency of recovering samples of fresh meteorites (Weryk et al 2008;Spurný et al 2017;Devillepoix et al 2019Devillepoix et al , 2020Daly et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Astrometric Calibration for All-sky Camera with Machine Learning

Jian-feng

et al. 2022

PASP

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The night images obtained with an all-sky camera can provide spatial and time sampling, which can be used for measurement cloud coverage measurement and meteor monitoring. The astrometric calibration of an all-sky camera is necessary because of strong field distortions. We use machine learning to complete the calibration of an all-sky camera. In order to prepare the data sets needed for machine learning, a particle swarm optimization algorithm is used to determine the parameters of the method proposed by Borovicka in 1995. Machine learning can transform plate coordinates to celestial coordinates and transform celestial coordinates to plate coordinates. The actual test shows that the standard deviation of residuals is of the order of 1′ for the transformation from plate coordinates to celestial coordinates and the standard deviation of residuals is of the order of 0.3 px for the transformation from celestial coordinates to the plate coordinates.

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The UK Fireball Alliance (UKFAll); combining and integrating the diversity of UK camera networks to aim to recover the first UK meteorite fall for 30 years

Cited by 3 publications

References 5 publications

The fusion crust of the Winchcombe meteorite: A preserved record of atmospheric entry processes

The fusion crust of the Winchcombe meteorite: A preserved record of atmospheric entry processes

The Winchcombe fireball—That lucky survivor

Astrometric Calibration for All-sky Camera with Machine Learning

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