Electrostatic and rotational ejection of dust particles from a disintegrating cometary aggregate

Oberč, P.

doi:10.1016/s0032-0633(96)00082-7

Cited by 13 publications

(20 citation statements)

References 11 publications

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“…Taking l of ∼ 300 km (Section 3.2), m of ∼ 10 −9 -10 −6 g, and a value of g corresponding to heliocentric distances of interest (∼ 0.6-0.8 AU), one finds that t sep falls in the range from ∼ 10 h to ∼ 2 days (cf. Oberc, 1997). So, the SDS residence times were much shorter than parent body ages.…”

Section: Particle Residence Time and Mass/age Of Sds Parent Bodiesmentioning

confidence: 97%

“…Since every dust subpopulation belonging to a SDS observable as the key form was a 3D object, particles constituting it had velocities with a component perpendicular to the parent body orbit plane, which means that they were ejected at birth, which could have been expected (Oberc, 1997). On the other hand, those particles, being fairly small, were accelerated by the solar radiation pressure antisunward.…”

Section: Estimate Of Mass Of Dust and Biggest Emitted Massmentioning

confidence: 99%

“…In order to derive consequences of the requirement that the dynamics of fragments be well-defined, let us first recall that solid state (dust) bodies were spun up by the expanding cometary gas, and their rotation periods can be estimated as: Oberc (1997); with the parent body radius a 0 of ∼ 0.1-0.5 m, and the terminal velocity v of v esc = 3.4 m s −1 or up to a few times higher, T rot comes out to be from ∼ 1 to a few min. So, T rot is orders of magnitude shorter than the age of a parent body.…”

Section: Well-defined Process Of Sds Formation Nature Of Sds Parent mentioning

confidence: 99%

“…Since secondary particles are ejected after the release (Oberc, 1997), and if not very large, pushed effectively antisunward by the solar radiation pressure, the dust population resulting from continuous production of small particles by a big first-step fragment will evolve into a minitail of dust, and the whole dust formation will look like that shown in Fig. 5a; for simplicity, the minitails are sketched as parabolas.…”

Section: Inadequacy Of Instantaneous Disintegrationmentioning

confidence: 99%

“…Fragments detached from a parent aggregate were ejected by at least two forces, electrostatic and centrifugal (Oberc, 1997). The velocity of rotational ejection is proportional to Fig.…”

Section: Ejection Of Fragments and Minitail Widthmentioning

confidence: 99%

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Small-scale dust structures in Halley's coma

Oberč

2004

Icarus

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Section: Particle Residence Time and Mass/age Of Sds Parent Bodiesmentioning

confidence: 97%

Section: Estimate Of Mass Of Dust and Biggest Emitted Massmentioning

confidence: 99%

Section: Well-defined Process Of Sds Formation Nature Of Sds Parent mentioning

confidence: 99%

Section: Inadequacy Of Instantaneous Disintegrationmentioning

confidence: 99%

“…Fragments detached from a parent aggregate were ejected by at least two forces, electrostatic and centrifugal (Oberc, 1997). The velocity of rotational ejection is proportional to Fig.…”

Section: Ejection Of Fragments and Minitail Widthmentioning

confidence: 99%

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Small-scale dust structures in Halley's coma

Oberč

2004

Icarus

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Equilibrium Points and Periodic Orbits in the Vicinity of Asteroids with an Application to 216 Kleopatra

Jiang

2015

Earth Moon Planets

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Abstract. In this study, equilibrium points and periodic orbits in the potential field of asteroids are investigated. We present the linearized equations of motion relative to the equilibrium points and characteristic equations. We find that the distribution of characteristic multipliers of periodic orbits around the equilibrium point and the distribution of eigenvalues of the equilibrium point correspond to each other. The distribution of eigenvalues of the equilibrium point confirms the topology and the stability of periodic orbits around the equilibrium point.

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Hamiltonian Formulation and Perturbations for Dust Motion Around Cometary Nuclei

et al. 2017

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In this paper we analyze the dynamical behavior of large dust grains in the vicinity of a cometary nucleus. To this end we consider the gravitational field of the irregularly shaped body, as well as its electric and magnetic fields. Without considering the effect of gas friction and solar radiation, we find that there exist grains which are static relative to the cometary nucleus; the positions of these grains are the stable equibria. There also exist grains in the stable periodic orbits close to the cometary nucleus. The grains in the stable equibria or the stable periodic orbits won't escape or impact on the surface of the cometary nucleus. The results are applicable for large charge dusts with small area-mass ratio which are near the cometary nucleus and far from the Solar. It is found that the resonant periodic orbit can be stable, and there exist stable non-resonant periodic orbits, stable resonant periodic orbits and unstable resonant periodic orbits in the potential field of cometary nuclei. The comet gravity force, solar gravity force, electric froce, magnetic force, solar radiation pressure, as well as the gas drag force are all considered to analyze the order of magnitude of these forces acting on the grains with different parameters. Let the distance of the dust grain relative to the mass centre of the cometary nucleus, the charge and the mass of the dust grain vary, respectively, fix other parameters, we clacluated the strengths of different forces. The motion of the dust grain depends on the area-mass ratio, the charge, and the distance relative to the comet's mass center. For a large dust grain (>1mm) close to the cometary nucleus which has a small value of area-mass ratio, the comet gravity is the largest force acting on the dust grain. For a small dust grain (<1mm) close to the cometary nucleus with large value of area-mass ratio, both the solar radiation pressure and the comet gravity are two major forces. If the a small dust grain which is close to the cometary nucleus have the large value of charge, the magnetic force, the solar radiation pressure, and the electric force are all major forces. When the large dust grain is far away from the cometary nucleus, the solar gravity and solar radiation pressure are both major forces.

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Electrostatic and rotational ejection of dust particles from a disintegrating cometary aggregate

Cited by 13 publications

References 11 publications

Small-scale dust structures in Halley's coma

Small-scale dust structures in Halley's coma

Equilibrium Points and Periodic Orbits in the Vicinity of Asteroids with an Application to 216 Kleopatra

Hamiltonian Formulation and Perturbations for Dust Motion Around Cometary Nuclei

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