Oort cloud perturbations as a source of hyperbolic Earth impactors

Peña-Asensio, Eloy; Visuri, Jaakko; Trigo-Rodríguez, Josep M.; Socas-Navarro, Hector; Gritsevich, Maria; Siljama, Markku; Rimola, Albert

doi:10.1016/j.icarus.2023.115844

Cited by 10 publications

(2 citation statements)

References 108 publications

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“…That fact, and the relative accessibility of Venus compared to other solar system planets or satellites with an atmosphere make this planet an ideal venue to conduct the first non-terrestrial meteor survey. Such a survey holds many benefits, including the significant expansion of the observational sample volume in the solar system for potential detection of interstellar meteors, a topic currently under debate in scientific discussions (Pẽna-Asensio et al, 2024).…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Meteor phenomena in the atmosphere of Venus

Christou¹,

Gritsevich

2023

Preprint

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Meteor astronomy employs the atmosphere of the Earth as a large area detector for 0.01-1000 mm meteoroids [1]. Monitoring the atmospheres of other planets for meteor activity offers the opportunity to study the parent bodies of as-yet-undetected meteor showers, test ablation models under non-terrestrial conditions and allow spacecraft operators to mitigate the risk of meteoroid impact damage [2]. By adjusting existing techniques to simulate meteoroid ablation in a Venus-like atmosphere [3-8], we show that Venusian meteors are generally brighter but shorter-lived than terrestrial meteors and ablate at a higher altitude, in a predominantly clear region of the atmosphere.&#160;These simulations are complemented with a list of cometary bodies and known meteoroid streams that we consider to be prime candidates for producing significant meteor activity at Venus [9,10]. Such predictions may be used in developing future observational campaigns to be carried out from Earth or from Venus orbit. References: [1]&#160;Jenniskens, P. (2006) Meteor Showers and their Parent Comets, Cambridge University Press, Cambridge. [2] Christou A. A. et al (2019) In: Meteoroids: Sources of Meteors on Earth and Beyond, Cambridge University Press, p.119-135. [3] Christou A. A. (2004) Icarus 168, 23-33 [4] McAuliffe, J. P., Christou, A. A. (2006) Icarus 180, 8-22 [5] Gritsevich M., Koschny D. (2011) Icarus 212, 877-884 [6] Bouquet A. et al (2012) Planet. Space Sci. 103, 238-249 [7] Gritsevich, M. I. (2009) Adv. Space Res. 44, 323&#8211;334 [8] Lyytinen, E., Gritsevich, M. (2016) Planet. Space Sci. 120, 35-42 [9] Christou A. A. (2010) MNRAS 402, 2759-2770 [10] Christou, A. A., Vaubaillon, J. (2011) In: Proc. Meteoroids Conf, NASA/CP-2011-216469, p.26

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Section: Conclusion and Discussionmentioning

confidence: 99%

Meteor phenomena in the atmosphere of Venus

Christou¹,

Gritsevich

2023

Preprint

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“…Velocities greater than ∼73 km s −1 are associated with objects originating beyond the confines of our solar system, such as the recent interstellar "visitor" 'Oumuamua (Meech et al 2017). However, in some exceptional cases, excess velocity might be explained solely by gravitational forces, even if the object belongs to the solar system, as proposed by Peña-Asensio et al (2024). The authors presented an example of a meteoroid with a measured velocity of 73.7 ± 0.6 km s −1 and originating from within the solar system.…”

Section: Bolide Infrasoundmentioning

confidence: 93%

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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2024

Origin of Life via Archaea

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Oort cloud perturbations as a source of hyperbolic Earth impactors

Cited by 10 publications

References 108 publications

Meteor phenomena in the atmosphere of Venus

Meteor phenomena in the atmosphere of Venus

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

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