Properties of small meteoroids studied by meteor video observations

Vojáček, Vlastimil; Borovička, J.; Koten, Pavel; Spurný, Pavel; Štork, R.

doi:10.1051/0004-6361/201833289

Cited by 41 publications

(68 citation statements)

References 29 publications

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“…Normal-type spectra form the largest group of our sample ( Fig. 7), similarly to previous studies of mm-sized meteoroids (Borovička et al 2005;Vojáček et al 2015Vojáček et al , 2019. Normal meteoroids are along with Na-poor, Na-enhanced, and Fe-poor meteoroids sometimes referred to as mainstream meteoroids.…”

Section: Spectral Classificationsupporting

confidence: 83%

“…16. A similar dependency was observed among fainter meteors by Vojáček et al (2019), but shifted lower Article number, page 11 of 19 A&A proofs: manuscript no. AA_2019_36093_p Terminal height [km] q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q Fe poor Fe rich Irons Na enhanced Na free Na poor Na rich Normal by approximately 8 km lower due to the different sensitivity of the system.…”

Section: Structuresupporting

confidence: 71%

“…Only one iron meteor has been identified in our sample (0.5%), compared to approximately 14% among the fainter meteors in the sample of Borovička et al (2005). Similarly, 10% of the sample detected by Vojáček et al (2019) were iron meteoroids. This is an unexpectedly large proportion considering the statistics from known meteorite falls.…”

Section: Spectral Classificationmentioning

confidence: 57%

“…8). The breaking point near 35 km s -1 was recently found as a good fit for data of Vojáček et al (2019). q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q q Fe poor Fe rich Irons Na enhanced Na free Na poor Na rich Normal Fig.…”

Section: Meteor Orbitsmentioning

confidence: 60%

“…6). No meteors were detected in this part of the ternary diagram in the surveys of fainter meteors (Borovička et al 2005;Vojáček et al 2015Vojáček et al , 2019. In some cases, the intensity of Fe can be overestimated in meteors during bright flares.…”

Section: Spectral Classificationmentioning

confidence: 92%

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Spectral and orbital survey of medium-sized meteoroids

Matlovič

Tóth

Rudawska

et al. 2019

A&A

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Aims. We investigate the spectra, material properties, and orbital distribution of millimeter-to decimeter-sized meteoroids. Our study aims to distinguish the characteristics of populations of differently sized meteoroids and reveal the heterogeneity of identified meteoroid streams. We verify the surprisingly large ratio of pure iron meteoroids on asteroidal orbits detected among mm-sized bodies. Methods. Emission spectra and multi-station meteor trajectories were collected within the AMOS network observations. The sample is based on 202 meteors of -1 to -14 magnitude, corresponding to meteoroids of mm to dm sizes. Meteoroid composition is studied by spectral classification based on relative intensity ratios of Na, Mg, and Fe and corresponding monochromatic light curves. Heliocentric orbits, trajectory parameters, and material strengths inferred from empirical K B and P E parameters were determined for 146 meteoroids.Results. An overall increase of Na content compared to the population of mm-sized meteoroids was detected, reflecting weaker effects of space weathering processes on larger meteoroids. The preservation of volatiles in larger meteoroids is directly observed. We report a very low ratio of pure iron meteoroids and the discovery of a new spectral group of Fe-rich meteors. The majority of meteoroids on asteroidal orbits were found to be chondritic. Thermal processes causing Na depletion and physical processes resulting in Na-rich spectra are described and linked to characteristically increased material strengths. Numerous major and minor shower meteors were identified in our sample, revealing various degrees of heterogeneity within Halley-type, ecliptical, and sungrazing meteoroid streams. Our results imply a scattered composition of the fragments of comet 2P/Encke and 109P/Swift-Tuttle. The largest disparities were detected within α-Capricornids of the inactive comet 169P/NEAT and δ-Aquarids of the sungrazing 96P/Machholz. We also find a spectral similarity between κ-Cygnids and Taurids, which could imply a similar composition of the parent objects of the two streams.A&A proofs: manuscript no. AA_2019_36093_p Fig. 1: Slovak part of the global AMOS network. Observations of the AMOS-Spec and AMOS stations by the Astronomical and Geophysical Observatory in Modra (AGO), Arborétum Tesárske Mlyňany (ARBO), Kysucké Nové Mesto (KNM), and Važec (VAZ) were used in this work. Red, green, and blue labels designate operating standard AMOS cameras, spectral stations, and planned stations.low-resolution meteor spectra , the rough composition (chondritic, achondritic, metallic) can be identified. We attempt to verify this hypothesis and try to look for additional information about the meteoroid nature and structure that can be revealed from determined orbital and atmospheric parameters.One of the most surprising results of the study by Borovička et al. (2005) was the large number of the detected pure-iron meteoroids, suggesting that iron meteoroids prevail among mmsized meteoroids on asteroidal orbits. These results are...

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Section: Spectral Classificationsupporting

confidence: 83%

Section: Structuresupporting

confidence: 71%