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Contribution of the Earth's gravitational potential to variations in orbital motion of short-period comets

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Research in Astronomy and Astrophysics 2016年第4期16卷 1-6页

作者： Valentina M.Chepurova Nelli V.Kulikova Elena N.Petrovskaya Sternberg Astronomical Institute Lomonosov Moscow State University Department of Computer Systems Networks and Technologies National Research Nuclear University Moscow Engineering Physics Institute Institute for Nuclear Power Engineering

We present simulation results on evolution development of orbital motion of short-period comets with the revolution period not exceeding 6-7 years, namely comets 21P/Giacobini-Zinner, 26P/Grigg- Skjellerup and 7P/Pons-Winnecke. The calculations cover the range from the date of the object＇s discovery to 2100. Variations in the objects＇ orbital elements under the action of gravity disturbances, taking Earth＇s gravitational potential into account when the small body approaches, are analyzed. Corrected dates of peri- helion passages can be used for scheduling observations.

关键词： comets: individual (21P/Giacobini-Zinner 26P/Grigg-Skjellerup 7P/Pons-Winnecke)-- me-teorites meteors meteoroids

Dust in the Jupiter system outside the rings

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Astrodynamics 2019年第1期3卷 17-29页

作者： Xiaodong Liu Jürgen Schmidt Astronomy Research Unit University of OuluOulu90014Finland

Jupiter is one of the major targets for planetary exploration,and dust in the Jovian system is of great interest to researchers in the field of planetary *** this paper,we review the five dust populations outside the ring system:grains in the region of the Galilean moons,potential dust from plumes on Europa,Jovian stream particles,particles in the outer region of the Jovian system ejected from the irregular satellites,and dust in the region of the Trojan *** physical environment for the dust dynamics is described,including the gravity,the magnetic field and the plasma *** each population,the dust sources are described,and the relevant perturbation forces are *** and results from modeling are reviewed,and the distributions of the individual dust populations are *** understanding of the Jovian dust environment allows to assess the dust hazard to spacecraft,and to characterize the material exchange between the Jovian moons,their surface properties and distribution of non-icy constituents.

关键词： cicumplanetary dust interplanetary dust stream particles planetary rings Europa plume Jupiter Galilean moons Trojan asteroids meteoroids space debris

Investigation into debris cloud characterizations for oblique hypervelocity impact of projectiles on bumper

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Journal of Harbin Institute of Technology(New Series) 2004年第4期11卷 372-376页

作者：张伟管公顺庞宝君李强张永强 School of Astronautics Harbin Institute of Technology Harbin 150001China

All long-duration spacecraft in low-earth-orbit are subject to high velocity impacts by meteoroids and space debris. Such impacts are expected to occur at non-normal incidence angles and can cause severe damage to the spacecraft and its external flight-critical systems and possibly lead to catastrophic failure of the spacecraft. In order to ensure crew safety and proper function of internal and external spacecraft systems, the characteristics of a debris cloud generated by such impacts must be known. An analytical model is therefore developed for the characterization of the penetration and ricochet debris clouds created by the hypervelocity impact of an aluminum spherical projectile on an aluminum plate. This model employs normal and oblique shock wave theory to characterize the penetration and ricochet processes. The prediction results of center-of-mass trajectory and leading velocity of penetration and ricochet debris clouds are obtained and compared with numerical and experimental results in figures.

关键词： meteoroids space debris hypervelocity velocity impact debris clouds

A preliminary analysis of the Shangri-La Bolide on 2017 Oct 4

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Earth and Planetary Physics 2018年第2期2卷 170-172页

作者： Quan-Zhi Ye Division of Physics Mathematics and Astronomy California Institute of Technology Infrared Processing and Analysis Center California Institute of Technology

At 12:07 UT(8:07 pm China Standard Time)on 2017 Oct 4,a bright bolide was widely observed in the Shangri-La region of the Province of Yunnan,China(Figure 1).The event was well observed by the general public as it took place on the night of the Mid Autumn Festival,which is associated with moon *** booms and ground shaking were reported in an area of about a thousand square kilometers northwest of Shangri-La *** from *** sensors suggests that the impact energy of the event was approximately 0.54 kt TNT equivalent,with the terminus of the bolide positioned at 28.1°N,99.4°*** is the largest observed bolide event over land since the bolide event that took place in Mauritania on 2016 Jun 27(1.2 kt).

关键词： meteorites meteors meteoroids