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Electron dynamics near diamagnetic regions of comet 67P/Churyumov- Gerasimenko [PDF]
Planetary and Space Science, 2020 The Rosetta spacecraft detected transient and sporadic diamagnetic regions around comet 67P/Churyumov-Gerasimenko. In this paper we present a statistical analysis of bulk and suprathermal electron dynamics, as well as a case study of suprathermal ...
M Galand, Martin Rubin, Hadi Madanian
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Ion composition and dynamics at comet Halley
Nature, 1986The Giotto space probe's ion mass spectrometer has obtained data on the composition and velocity distributions of cometary ions at distances of between 7.5 million and 1300 km from the comet Halley nucleus. Solar wind He(2+) was found throughout the coma, as close as 5000 km, with the He(+) produced by charge exchange being within about 200,000 km.
Balsiger, H. +18 more
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Dynamical Relation of Meteorids to Comets and Asteroids
Earth, Moon, and Planets, 2004We tested four criteria used for discrimination between asteroidal and cometary type of orbits: Whipple criterion K, Kresak criterion Pe, Tisserand invariant T and aphelion distance Q. To estimate their reliability, all criteria were applied to classify the 2225 orbits of NEAs and 582 orbits of comets, for several epochs spanning the time interval of ...
S. Starczewski, T. J. Jopek
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On the dynamic connection of comets with Uranus
Kinematics and Physics of Celestial Bodies, 2012We consider the connection with Uranus for: (1) 945 near-parabolic comets (the period P > 200 years, the perihelion distance q > 0.1 AU), (2) 1277 Kreutz comets (P > 200 years, q < 0.01 AU), and (3) 414 short-period comets (P < 200 years). It turns out that none of near-parabolic comets passed through Uranus’s activity sphere, none of the Kreutz comets
O. V. Kalinicheva, V. P. Tomanov
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Spacecraft Dynamics in the Vicinity of a Comet
The Journal of the Astronautical Sciences, 2002The 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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Dynamics of the AMPTE artificial comet
Nature, 1986Sweeping the plasma before it, the interplanetary magnetic field quickly penetrated into an initially diamagnetic barium plasma cloud. The field was strongly compressed and extended in the flow direction. Ions accelerated by electric polarization fields formed a visible tail at the rear of the cloud; their recoil balancing the magnetic stresses.
G. Haerendel +3 more
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Dynamics of periodic comets and meteor streams
Celestial Mechanics and Dynamical Astronomy, 1992The 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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Dynamical Evolution of Comets and the Problem of Cometary Fading
Earth, Moon, and Planets, 1996Possibilities 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, 1997Abstract 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. +3 more
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On the aerial dynamics of the Swift-Tuttle comet
Planetary and Space Science, 1993Abstract 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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