Results 251 to 260 of about 8,464 (293)

Dynamics of periodic comets and meteor streams

Celestial Mechanics and Dynamical Astronomy, 1992
The methods for an investigation of the evolution of orbits with large eccentricities are presented. The role of resonances in the motion of comets is considered. The expansion of the disturbing function in the restricted three-body problem is obtained for cometary orbits. The method is based on the proximity of cometary eccentricities to 1.
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Spacecraft Dynamics in the Vicinity of a Comet

The Journal of the Astronautical Sciences, 2002
The motion of a spacecraft about a comet is studied under the assumption that the spacecraft is in the vicinity of the body (but far enough so that the higher gravitational moments can be neglected) and is subject to its gravitational attraction modeled as a point mass, the solar gravitational attraction and the solar radiation pressure.
D. J. Scheeres, F. Marzari
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Dynamical Evolution of Comets and the Problem of Cometary Fading

Earth, Moon, and Planets, 1996
Possibilities to explain the observed 1/a-distribution are discussed in the light of improved understanding of the dynamical evolution of long-period comets. It appears that the ‘fading problem’ applies both to single-injection and continuous-injection models.
V. V. Emel'yanenko, M. E. Bailey
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Origin and dynamics of comets and star formation

Planetary and Space Science, 1997
Abstract Several important consequences that would arise for the solar system's comet population if the Sun formed in an embedded star cluster are outlined. Owing to the higher stellar number density and larger tidal fields in this environment, formation of the comet cloud would proceed differently from that envisaged in a usually assumed isolated ...
Eggers, S., Keller, H., Kroupa, P., Markiewicz, W.   +3 more
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Origin of Comet Nuclei and Dynamics

Space Science Reviews, 2007
We present a review of the main physical features of comet nuclei, their birthplaces and the dynamical processes that allow some of them to reach the Sun’s neighborhood and become potentially detectable. Comets are thought to be the most primitive bodies of the solar system although some processing—for instance, melting water ice in their interiors and
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Dynamical Origin of Comets and Their Reservoirs

Space Science Reviews, 2008
It is widely believed that cometary orbits contain important clues to both the outer solar system’s current structure and its past dynamical evolution. The first part of this paper summarizes the results of numerical simulations designed to study the dynamical origins of observed comets and to link the observed populations to the reservoirs from which ...
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On the aerial dynamics of the Swift-Tuttle comet

Planetary and Space Science, 1993
Abstract Nonlinear dynamical equations describing the atmospheric dynamical interaction of comet Swift-Tuttle—possibly due to approach the Earth in 2126—are formulated, and mass ablation, velocity reductions and flight times are evaluated. These calculations suggest that the atmosphere offers little resistance to such a massive hypersonically ...
S.J.D. D'Alessio, A.A. Harms
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Dynamically New Comets in the Solar System

2001
Traditional definition of a dynamically ‘new’ comet, which is the comet for the first time visiting our planetary system, is that it should have its 1/a < 1 × 10−4 AU−1 (eg. Oort and Schmidt, 1951). This definition is based on the value of semimajor axis of the comet at the moment it is observed, but it does not take into regard its dynamical history ...
Piotr A. Dybczyński, Halina Prfętka-Ziomek   +1 more
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Dynamical Evolution and Disintegration of Comets

1982
Current concepts of the origin and evolution of comets are reviewed. The place of their formation from which they have been delivered into the Oort reservoir is still an open problem, but the region of the outermost planets appears most probable. The interplay of stellar and planetary perturbations can be traced by model computations which reveal both ...
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The Dynamics of Charged Dust in the Tail of Comet Giacobini-Zinner

Journal of Geophysical Research: Space Physics, 1986
A numerical simulation has been performed to calculate the distributions of dust particles of various sizes down the tail of comet P/Giacobini‐Zinner. When the electrostatic charging of the grains in the plasma and radiative environment of the comet is taken into account, it is found that the distribution of the grains (particularly at the lowest end ...
M. Horanyi, D. A. Mendis
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