Results 251 to 260 of about 3,231,447 (290)

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 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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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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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 Features of the Oort Cloud Comets

2009
The Oort cloud which corresponds to the outer boundary of our Solar system, is considered to be the main reservoir of long period comets. At such distance from the Sun (several times 10 000 AU), the comet trajectories are affected by the galactical environment of the Solar System.
M. Fouchard, C. Froeschlé, H. Rickman, G. B. Valsecchi   +3 more
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Dynamics of comets in the collapsing protosolar nebula

International Astronomical Union Colloquium, 1999
AbstractComets are created in the cool, dense regions of interstellar clouds. These macroscopic bodies take place in the collapse of protostar cloud as mechanically moving bodies in contrast to the gas and miscroscopic dust holding the laws of hydrodynamics.
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A dynamical study on extrasolar comets

2017
Since the detection of absorption features in spectra of beta Pictoris varying on short time scales it is known that comets exist in other stellar systems. We investigate the dynamics of comets in two differently build systems (HD 10180 and HIP 14810).
Loibnegger, Birgit, Dvorak, Rudolf
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A Dynamical Study of Possible Birthplaces of Comets

1982
The orbital evolution of comets with different assumed birthplaces, namely the Uranus-Neptune region, the Jupiter region and ‘in-situ’ from where ‘new’ comets seem to come, is followed numerically throughout the solar system lifetime. Perturbations of the four giant planets and random passing stars are considered.
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The dynamical lifetime of comet P/Halley

1988
Using an extension of Opik’s techniques the stability of the orbit of Halley’s comet under close encounters with the planets is investigated, and it is found that the orbital changes due to such encounters expected over a long time-base are of the same order as the effects of more distant planetary perturbations and non-gravitational effects.
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Comet: Dynamics

2006
Fernández, J., Ip, W.
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