A5036493526- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Isotope Analysis in Ecology
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Geomagnetism and Paleomagnetism Studies
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Ionosphere and magnetosphere dynamics
- Advanced Thermodynamics and Statistical Mechanics
- Distributed and Parallel Computing Systems
- Inertial Sensor and Navigation
- Spacecraft and Cryogenic Technologies
- Space Exploration and Technology
- Radioactive contamination and transfer
- Superconducting and THz Device Technology
- Mining and Industrial Processes
- Space Satellite Systems and Control
- Geological and Geochemical Analysis
- Magnetic confinement fusion research
- Geology and Paleoclimatology Research
- Management Systems and Quality Improvement
- Astrophysics and Cosmic Phenomena
Astronomical Observatory
2024
Adam Mickiewicz University in Poznań
2003-2020
Queen Mary University of London
2015
The Silesian Planetarium
2003-2010
We introduce a new approach to meteoroid stream identification, based on distance function involving four geocentric quantities that are directly linked observations; the is thus defined in space has as many dimensions number of independently measured physical quantities, at variance from conventional orbital similarity criterion Southworth & Hawkins. Two variables turn out be near-invariant with respect principal secular perturbation affecting orbits, one associated cycle ο.
Near-Earth objects (NEO) are that come close to the Earth's orbit. If dust is ejected from them through any process, a meteoroid stream will form which may be seen on Earth as meteor shower. As orbits evolve rapidly in this region of Solar system, similarity at present time not sufficient prove relationship; integrations needed show evolution over substantial period similar.
The complete characterisation of the Tunguska event 30th June 1908 is still a challenge for astrophysicists. We studied huge amount scientific literature to select data directly available from measurements and we introduced parameters calculated by application models, evaluated other possibilities. then selected range meaningful atmospheric trajectories, which extracted set possible orbits. obtained 886 orbits, were used estimate probabilities origin Cosmic Body (TCB). found that probability...
The paper expands the idea of Vokrouhlický and Nesvorný who used a modified Zappalà et al. metric with osculating elements in search for pairs asteroids suspected having common origin. Using six different orbital similarity functions, we find that five them display similar excess close catalogue elements. is even higher when mean are used. Similarly, applied, there better agreement between closest found same using metrics. subset 62 from lists 100 according to distance functions provided....
The new criterion DNfor meteoroid stream identification, based on variables directly linked to observations, is applied a set of 865 photographic meteor orbits and the results are compared with those obtained using well-known widely used DScriterion Southworth & Hawkins, thresholds for association computed according Jopek Froeschlé. For 15 streams, including Lyrids, α Capricornids, Perseids, Taurids, Quadrantids, Geminids, Leonids, Orionids southern δ Aquarids, two searches in very good...
The Shower Database (SD) of the Meteor Data Center (MDC) has been operating for 15 years and is used by entire community meteor astronomers. It contains showers categorised in individual lists on basis their status. Since inception SD, no objective rules moving between have established. content SD not yet checked correctness data contained therein. Our aims are (1) to formulate criteria nominating established status, (2) improve removal showers, (3) verify enhance (4) user area MDC SD. from...
Abstract— The properties and history of the parent meteoroid Morávka H5–6 ordinary chondrites have been studied by a combination various methods. pre‐atmospheric mass was computed from fireball radiation, infrasound, seismic signal, content noble gases in meteorites. All methods gave consistent results. best estimate is 1500 ± 500 kg. integral bolometric luminous efficiency 9%, acoustic 0.14%. cosmic ray exposure age determined to be (6.7 1.0) × 10 6 yr. meteorite shows clear deficit helium,...
The new criterion DN for meteoroid stream identification, based on variables directly linked to observations, is applied four sets of photographic meteors, three which have been obtained by independent teams, and the fourth combining first three. We find that if one data has statistical properties significantly different from others, use a determine thresholds search does not lead satisfactory results.
The traditional approach used for averaging the parameters of a meteoroid gives results that are biased by several conceptual defects: among others things, mean orbital elements do not satisfy laws celestial mechanics. Voloshchuk & Kashcheev method in domain geocentric removes all these defects except one: epoch corresponding to values, which is critical calculation heliocentric from radiant coordinates and velocity. We propose new approach: our solution meteor stream, free faults. Instead...
In this study, 231 video meteoroid orbits observed at the Southern hemisphere were searched for streams. Several searches have been made using three D-criteria: DSH, DN and DV. The mutual D-distances processed by a cluster analysis algorithm based on single neighbour linking technique. values of association thresholds groups 2, 3, 4, … members estimated statistical approach. all basic searches, about 29–33 per cent sample turned out to belong stream component. following streams detected: η...
Fifteen orbital clusters (associations) were identified among ~20000 near Earth asteroids (NEAs). All associations found with a high statistical reliability using single linkage cluster analysis algorithm and three similarity functions. The groups constitute small fraction (4.74 %) of the entire sample. Nonetheless they may be hazardous to its inhabitants. As it happens meteoroid streams, every year comes very close orbits each association. In two cases (2008TC3 2017FU102) distance between...