Quantifying the Nature and the Magnitude of the Hazard from Asteroid Impacts

Trigo-Rodríguez, Josep M.

doi:10.1007/978-3-030-95124-5_5

Cited by 2 publications

(2 citation statements)

References 43 publications

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“…The study of meteoroids and asteroids holds practical implications, from better understanding our solar system formation and evolution, to planetary defense. For example, understanding frequency, size distribution, and near-Earth object (NEO) impact hazard is crucial for assessing and mitigating the risks these objects pose to humans, infrastructure, and the biosphere [22][23][24][25][26][27][28]. A sobering example of damage that could be inflicted by a NEO is the Chelyabinsk bolide.…”

Section: Meteoroids and Asteroidsmentioning

confidence: 99%

A Review of Infrasound and Seismic Observations of Sample Return Capsules since the End of the Apollo Era in Anticipation of the OSIRIS-REx Arrival

Silber,

Bowman,

Albert

2023

Atmosphere

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Advancements in space exploration and sample return technology present a unique opportunity to leverage sample return capsules (SRCs) towards studying atmospheric entry of meteoroids and asteroids. Specifically engineered for the secure transport of valuable extraterrestrial samples from interplanetary space to Earth, SRCs offer unexpected benefits that reach beyond their intended purpose. As SRCs enter the Earth’s atmosphere at hypervelocity, they are analogous to naturally occurring meteoroids and thus, for all intents and purposes, can be considered artificial meteors. Furthermore, SRCs are capable of generating shockwaves upon reaching the lower transitional flow regime, and thus can be detected by strategically positioned geophysical instrumentation. NASA’s OSIRIS-REx (Origins, Spectral Interpretation, Resource Identification, and Security-Regolith Explorer) SRC is one of only a handful of artificial objects to re-enter the Earth’s atmosphere from interplanetary space since the end of the Apollo era and it will provide an unprecedented observational opportunity. This review summarizes past infrasound and seismic observational studies of SRC re-entries since the end of the Apollo era and presents their utility towards the better characterization of meteoroid flight through the atmosphere.

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Section: Meteoroids and Asteroidsmentioning

confidence: 99%

A Review of Infrasound and Seismic Observations of Sample Return Capsules since the End of the Apollo Era in Anticipation of the OSIRIS-REx Arrival

Silber,

Bowman,

Albert

2023

Atmosphere

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“…Observations of large bolide impacts on a global scale are of the utmost importance for a number of reasons, including planetary defense, impact risk hazard assessment, event characterization, and improving global monitoring efforts (e.g., Chapman 2008;Christie & Campus 2010;Mainzer 2017;Silber et al 2018;Trigo-Rodríguez 2022). Current monitoring technologies include ground instruments (e.g., dedicated camera systems, infrasound, and radar; e.g., Janches et al 2006;Koschny et al 2017;Silber & Brown 2019;Drolshagen et al 2021), floating platforms (e.g., scientific payloads suspended on high-altitude balloons; Young et al 2018;Bowman 2021), and space-based assets (e.g., U.S. government or USG sensors and the Geostationary Lightning Mapper or GLM instrument; Nemtchinov et al 1997;Jenniskens et al 2018;Ott et al 2021;Morris et al 2022).…”

Section: Introductionmentioning

confidence: 99%

The Utility of Infrasound in Global Monitoring of Extraterrestrial Impacts: A Case Study of the 2008 July 23 Tajikistan Bolide

Silber

2024

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Among the various observational techniques used for the detection of large bolides on a global scale is a low-frequency sound known as infrasound. Infrasound, which is also one of the four sensing modalities used by the International Monitoring System, offers continuous global monitoring and can be leveraged for planetary defense. Infrasonic records can provide an additional dimension for event characterization and a distinct perspective that might not be available through any other observational method. This paper describes the infrasonic detection and characterization of the bolide that disintegrated over Tajikistan on 2008 July 23. This event was detected by two infrasound stations at distances of 1530 and 2130 km. Propagation paths to one of the stations were not predicted by the model, despite being clearly detected. The presence of the signal is attributed to the acoustic energy being trapped in a weak but leaky stratospheric AtmoSOFAR channel. The infrasound signal analysis indicates that the shock originated at the point of the main breakup at an altitude of 35 km. The primary mode of the shock production of the signal detected at the two stations was a spherical blast resulting from the main gross fragmentation episode. The energy estimate, based on the signal period, is 0.17–0.51 kt of TNT equivalent, suggesting a mass of 6.6–23.5 tons. The corresponding object radius, assuming the chondritic origin, was 0.78–1.18 m.

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Quantifying the Nature and the Magnitude of the Hazard from Asteroid Impacts

Cited by 2 publications

References 43 publications

A Review of Infrasound and Seismic Observations of Sample Return Capsules since the End of the Apollo Era in Anticipation of the OSIRIS-REx Arrival

A Review of Infrasound and Seismic Observations of Sample Return Capsules since the End of the Apollo Era in Anticipation of the OSIRIS-REx Arrival

The Utility of Infrasound in Global Monitoring of Extraterrestrial Impacts: A Case Study of the 2008 July 23 Tajikistan Bolide

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