Automatic Video System for Continues Monitoring of the Meteor Activity

Koten, Pavel; Fliegel, Karel; Vítek, Stanislav; Páta, Petr

doi:10.1007/s11038-011-9380-9

Cited by 20 publications

(6 citation statements)

References 5 publications

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“…All Draconids were used for the work of Borovička et al (2014). Data for three Leonids meteors from the Tajikistan expedition were published in the work of Koten et al (2011). The meteor numbered 07406018 was already analysed in the work of Borovička et al (2008).…”

Section: Data Sourcementioning

confidence: 99%

Properties of small meteoroids studied by meteor video observations

Vojáček

Borovička

Koten

et al. 2019

A&A

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Aims. The complex study of millimetre-sized meteoroids can reveal more about the structure and origin of population of these meteoroids. Methods. Double-station video observations, paired with spectroscopic video observations, were used to study small meteoroids. In total 152 sporadic and shower meteors of maximum brightness between magnitude −5 and +3 were analysed. Spectral classification was based on time-integrated intensities of lines of Na, Mg, and Fe. Meteor light curves and deceleration were fitted by the grain erosion model. Heliocentric orbits of all meteors were computed. Monochromatic light curves were constructed in order to study differential ablation. The length of meteor wakes was evaluated as well.Results. The variety of properties among millimetre-sized meteoroids proved different sources and histories of this material. Meteoroids that contain small grains tend to release their sodium early. For given grain sizes, the sodium in Na-poor meteoroids is released earlier than in meteors without sodium depletion. Overall, meteoroids with sodium depletion are revealed to have different structures: they have stronger material without very small grains and they do not show very bright wakes. Two iron meteoroids on Halley-type orbits were observed, thereby supporting the idea of large-scale mixing of material in the early solar system. The distribution of grain sizes of Jupiter-family members was in good agreement with results from the COSIMA instrument on the ROSETTA probe.

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Section: Data Sourcementioning

confidence: 99%

Properties of small meteoroids studied by meteor video observations

Vojáček

Borovička

Koten

et al. 2019

A&A

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“…139.73 ± 0.03 to the fireball, its atmospheric trajectory and heliocentric orbit were calculated (Table 1) with very high precision 1 . The same event was also recorded by the digital video camera system MAIA (Koten et al 2011;Vítek et al 2016) deployed at the Kunžak station (λ = 15 • 12 E; ϕ = 49 • 6 N, altitude = 652 m). This camera records digital video at 61.15 frames per second in 10 bits of the signal depth, and provides a circular field of view (FOV) with a diameter of about 50 • .…”

Section: Data Acquisition and Processingmentioning

confidence: 99%

September epsilon Perseid cluster as a result of orbital fragmentation

Koten

Čapek

Spurný

et al. 2017

A&A

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Context. A bright fireball was observed above the Czech Republic on September 9, 2016, at 23:06:59 UT. Moreover, the video cameras at two different stations recorded eight fainter meteors flying on parallel atmospheric trajectories within less than 2 s. All the meteors belong to the September epsilon Perseid meteor shower. The measured proximity of all meteors during a very low activity meteor shower suggests that a cluster of meteors was observed. Aims. The goal of the paper is first to determine whether this event was a random occurrence or a real meteor cluster and second, if it was a cluster, to determine the epoch and at what distance from the Earth the separation of the particles occurred. Methods. The atmospheric trajectories of the observed meteors, masses, and relative distances of individual particles were determined using a double-station observation. According to the distances and masses of the particles, the most probable distance and time of fragmentation is determined. Results. The observed group of meteors is interpreted as the result of the orbital fragmentation of a bigger meteoroid. The fragmentation happened no earlier than 2 or 3 days before the encounter with the Earth at a distance smaller than ∼0.08 AU from the Earth.

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“…For system analysis presentation were used data acquired by MAIA (Meteor Automatic Imager and Analyzer System) (Koten et al 2011). Detection and modeling methods were then applied to chosen parts of astronomical image presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

Application of optimization heuristics for complex astronomical object model identification

2014

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Detection and localization of astronomical objects are two of the most fundamental topics in astronomical science where localization uses detection results. Object localization is based on modeling of point spread function and estimation of its parameters. Commonly used models as Gauss or Moffat in objects localization provide good approximation of analyzed objects but cannot be sufficient in the case of exact applications such as object energy estimation. Thus the use of sophisticated models is upon the place. One of the key roles plays also the way of the objective function estimation. The least square method is often used, but it expects data with normal distribution, thus there is a question of a maximum likelihood method application. Another important factor of presented problem is choice of the right optimization method. Classical methods for objective function minimization usually require a good initial estimate for all parameters and differentiation of the objective function with respect to model parameters. The results indicated that stochastic methods such as simulated annealing or harmony search achieved better results than the classical optimization methods.

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Automatic Video System for Continues Monitoring of the Meteor Activity

Cited by 20 publications

References 5 publications

Properties of small meteoroids studied by meteor video observations

Properties of small meteoroids studied by meteor video observations

September epsilon Perseid cluster as a result of orbital fragmentation

Application of optimization heuristics for complex astronomical object model identification

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