J/A+A/629/A71 mm-dm-sized meteoroids spectral & orbital survey (Matlovic+, 2019)
Spectral and orbital survey of medium-sized meteoroids.
Matlovic P., Toth J., Rudawska R., Kornos L., Pisarcikova A.
<Astron. Astrophys. 629, A71 (2019)>
=2019A&A...629A..71M 2019A&A...629A..71M (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Comets ; Spectroscopy
Keywords: meteorites, meteors, meteoroids - minor planets, asteroids: general -
comets: general - techniques: spectroscopic
Abstract:
We investigate the spectra, material properties and orbital
distribution of mid-sized meteoroids. Our study aims to distinguish
characteristics of different size populations of meteoroids and reveal
the heterogeneity of identified meteoroid streams. The 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-dm in size.
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. We report on 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.
Description:
Orbital and radiant parameters (table 5), along with spectral,
atmospheric and material strengths parameters (table 6) of meteors
observed by multiple stations are presented. Selected orbital elements
for hyperbolic solutions and the large errors of semi-major axes for
near parabolic solutions were omitted.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 145 146 Orbital and radiant parameters
table6.dat 122 146 Spectral, trajectory and material parameters
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Code Meteor code in format yyyymmdd_hhmmss
18- 20 A3 --- Show Shower association in IAU MDC code
22- 27 F6.2 deg RAg Radiant right ascension
29- 34 F6.2 deg DEg Radiant declination
36- 40 F5.2 km/s vg Geocentric velocity
42- 46 F5.2 au a ?=- Semi-major axis
48- 51 F4.2 --- e ?=- Eccentricity
53- 57 F5.3 au q Perihelion distance
59- 63 F5.2 au Q ?=- Aphelion distance
66- 72 F7.3 deg i Inclination
74- 80 F7.3 deg omega Argument of perihelion
82- 88 F7.3 deg Omega Longitude of the ascending node
90- 94 F5.2 --- TJ ?=- Tisserand parameter with respect to Jupiter
96- 99 F4.2 deg e_RAg Radiant right ascension error
101-105 F5.3 deg e_DEg Radiant declination error
106-110 F5.2 km/s e_vg Geocentric velocity error
112-116 F5.2 au e_a ?=- Semi-major axis error
118-121 F4.2 --- e_e ?=- Eccentricity error
123-127 F5.3 au e_q Perihelion distance error
129 A1 --- --- [-]
131-134 F4.2 deg e_i Inclination error
136-141 F6.2 deg e_omega Argument of perihelion error
143 A1 --- --- [-]
145 A1 --- --- [-]
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Code Meteor code in format yyyymmdd_hhmmss
18- 28 A11 --- SpType Spectral type
30- 34 F5.1 mag MAG Absolute magnitude
36- 40 F5.2 --- Na/Mg NaI-1/MgI-2 intensity ratio
42- 46 F5.2 --- Fe/Mg FeI-15/MgI-2 intensity ratio
48- 52 F5.2 km/s vi Initial velocity
54- 59 F6.2 km HB Beginning height
61- 65 F5.2 km HE Terminal height
67- 72 F6.2 km L Trajectory length
74- 77 F4.2 --- KB KB material strength
79- 81 A3 --- ClassKB KB material strength class
83- 87 F5.2 --- PE PE material strength
89- 92 A4 --- ClassPE PE material strength class
94- 96 F3.1 mag e_MAG Absolute magnitude error
98-101 F4.2 --- e_Na/Mg NaI-1/MgI-2 intensity ratio error
103-106 F4.2 --- e_Fe/Mg FeI-15/MgI-2 intensity ratio error
108-111 F4.2 km/s e_vi Initial velocity error
113-116 F4.2 --- e_KB KB material strength error
118-122 F5.2 --- e_PE PE material strength error
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Acknowledgements:
Pavol Matlovic, matlovic(at)fmph.uniba.sk
(End) P. Matlovic [Comenius Univ. Bratislava], P. Vannier [CDS] 24-Jul-2019