Meteoroids from comet P/Halley. The comet’s mass production and age

Hajduk, A.

doi:10.1007/978-3-642-82971-0_159

Cited by 7 publications

(8 citation statements)

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“…These values must break down at the extremes of the mass range; few large particles (= a few hundred kilograms. Hajduk 1987, Jones et al 1989 are given off by comets, and very tiny particles are removed from streams by radiation forces. In spite of the difficulty of obtaining accurate measures of mass indices, there are semi-quantitative effects to be explained.…”

Section: N -C Z Nf' 5 ' 1 'mentioning

confidence: 99%

“…The diagram shows concentrations and structure, particularly among larger particles. Thus it seems likely that the fine structure seen in the Halley showers (Hajduk 1980, Cevolani andHajduk 1987) does not require the 10 5 -year lifetime postulated by Mcintosh and Hajduk (1983), but can arise in a few thousand years due to bunching in the gravitational dispersion.…”

Section: Closest Approach To Jupitermentioning

confidence: 99%

“…Also, the procedure for calculating the mass of streams, as outlined in the next section, is fraught with difficulty. Hajduk (1987) used the mass of the stream calculated earlier (Mcintosh and Hajduk 1983) to estimate the age of the comet as 2 x 10 5 yr, which he takes to be synonymous with the age of the stream. The value determined by Jones et al noted above differs by an order of magnitude.…”

Section: )mentioning

confidence: 99%

“…As noted in the previous section, both Hajduk (1987) and Jones et al (1989) have derived values for the age of the Halley stream, based on calculations of the stream mass, which differ by a factor of ten. In both cases, the authors used the same elongated cross-section.…”

Section: )mentioning

confidence: 99%

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Debris from Comets: The Evolution of Meteor Streams

McIntosh¹

1989

International Astronomical Union Colloquium

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The evolution of meteor streams is controlled basically by: (a) the initial velocities with which the particles were ejected from the parent body; (b) gravitational perturbations by the planets; (c) radiation forces; and (d) collisions. This review focuses mainly on recent numerical modelling dealing with (b) and (a).Ejection velocities spread the particles around the orbit, closing the ring in a few tens of revolutions. The greater ejection velocities of smaller particles cause more rapid dispersion both around the orbit and in the cross section.A determination of the effects of gravitational perturbations must take into account the distributed properties of the stream. The stream’s evolution is dependent on the short-term impulse nature of planetary perturbations, as well as on long-term secular effects. The combined effects produce complex stream cross-sections as in the ribbon-like form of the Halley stream (Orionid and η Aquarid showers) or as in the changes in the annual position of peak shower activity shown by the Quadrantids. Perturbations may cause the orbit of a parent body to sweep rapidly across the orbit of the Earth. But the associated particle stream may not be lost as a meteor shower because it tends to become dispersed in a manner that ensures a continuing supply of particles in Earth-crossing orbits. The nodes of the observed meteoroid orbits may show very little motion compared with the rapid motion of the nodes of the orbit of the parent object.Radiation effects contribute to size separation of particles. Very small particles are blown out of the stream or spiral in toward the sun because of Poynting–Robertson drag. Older meteor streams usually show a predominance of large particles.

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Section: N -C Z Nf' 5 ' 1 'mentioning

confidence: 99%

Section: Closest Approach To Jupitermentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Section: )mentioning

confidence: 99%

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Debris from Comets: The Evolution of Meteor Streams

McIntosh¹

1989

International Astronomical Union Colloquium

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“…The dynamical lifetime (time scale to remain on any kind of Halley type comet orbit, i.e., orbital period from 20 to 200 yr) of 1P/Halley is estimated to be of the order of 100,000 yr (Hughes 1985;Hajduk 1986;Steel 1987;Bailey and Emel'yanenko 1996). Bailey and Emel'yanenko (1996) showed that Halley undergoes Kozai resonance (Kozai 1979) during its long-term evolution.…”

Section: Introductionmentioning

confidence: 99%