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How to build a continental scale fireball camera network

Abstract

The expansion of the Australian Desert Fireball Network has been enabled by the development of a new digital fireball observatory based around a consumer digital camera. The observatories are more practical and much more cost effective than previous solutions whilst retaining high imaging performance. This was made possible through a flexible concurrent design approach, a careful focus on design for manufacture and assembly, and by considering installation and maintenance early in the design process. A new timing technique for long exposure fireball observatories was also developed to remove the need for a separate timing subsystem and data integration from multiple instruments. A liquid crystal shutter is used to modulate light transmittance during the long exposure which embeds a timecode into the fireball images for determining fireball arrival times and velocities. Using these observatories, the Desert Fireball Network has expanded to cover approximately 2.5 million square kilometres (around one third of Australia). The observatory and network design has been validated via the recovery of the Murrili Meteorite in South Australia through a systematic search at the end of 2015 and the calculation of a pre-atmospheric entry orbit. This article presents an overview of the design, implementation and performance of the new fireball observatories.

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Acknowledgments

The authors would like to thank the Arabana people for assistance recovering and naming the Murrili meteorite, the generous pastoral station owners for hosting observatories and the other volunteers that have made this project possible. This research was supported by the Australian Research Council through the Australian Laureate Fellowships scheme and receives institutional support from Curtin University. The authors also wish to thank the anonymous reviewer for their constructive comments which have significantly improved the quality of this manuscript. The authors have no conflicts of interest to declare.

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Correspondence to Robert M. Howie.

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Howie, R.M., Paxman, J., Bland, P.A. et al. How to build a continental scale fireball camera network. Exp Astron 43, 237–266 (2017). https://doi.org/10.1007/s10686-017-9532-7

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Keywords

  • Meteors
  • Meteorites
  • Fireballs
  • Bolides
  • Camera networks
  • Autonomous observatories
  • Distributed networks