Drift and accretion of interplanetary dust and the transformation of its orbits

Details Drift and accretion of interplanetary dust and the transformation of its orbits Drift and accretion of interplanetary dust and the transformation of its orbits

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994avest..28..116k&link_type=abstract

Astronomicheskij Vestnik (ISSN 0320-930X), vol. 28, no. 3, p. 116-125

Astronomy and Astrophysics

Astronomy

Deposition, Drift Rate, Gravitational Effects, Interplanetary Dust, Planetary Orbits, Statistical Distributions, Mars (Planet), Mercury (Planet), Moon, Orbital Velocity, Particle Size Distribution, Poynting-Robertson Effect

Scientific paper

In statistical distributions of orbits of relatively small dust particles one can easily separate a heavy class of the so-called 'minor' orbits (with a semi-axis a less than 2.5 AU) with retrograde motion (the inclination of the orbit's plane being i greater than 90 deg). Among orbits of larger bodies such orbits are not observed. Motion of all the large bodies is direct (i less than 40 deg); the values of semi-axis a less than 2-3 AU are common. The acquisition of dust particles (far within the orbits of Jupiter and Mars) with retrograde motion can be explained, at first, by disintegration of long-periodic and nearly parabolic comets, and, at second, by a long-term (acting during millions of years) Poynting-Robertson effect. The drift of particles of all possible dimensions is accompanied by gravitational accretion. In the latter the most essential is the influence of Jupiter and Saturn; relatively larger particles with a particle size p less than 1 cm across are accreted to a greater extent. The disintegration of comets, Poynting-Robertson effect and accretion result in simultaneous existence of the above orbits' classes. As Stanyukovitch and Fedynsky have shown, the fall of meteor particles onto the surface of atmosphere-free celestial bodies (Mercury, Moon and possibly, Mars) with the velocity of 20-80 km/sec is followed by the ejection of secondary particles. Their velocity exceeds escape velocity for a corresponding celestial body. Thus, around the orbits of Mercury, Earth and Mars there will be originated an additional source of slowly moving dust. It is due to the Poynting-Robertson effect that the dust soon proves to be inside the region occupied by the zodiacal light.

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