Albedos and size distribution of meteoroids from 0.3 to 4.8 AU

Astronomy and Astrophysics – Astronomy

Scientific paper

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Albedo, Astronomical Photometry, Meteoroid Concentration, Micrometeoroids, Particle Size Distribution, Zodiacal Light, Helios A, Jupiter (Planet), Lunar Craters, Mariner Jupiter-Saturn Flyby, Pioneer 10 Space Probe, Albedo, Meteoroids, Abundance, Particles, Pioneer 10, Helios A, Meteoroid Impacts, Radar, Density, Zodiacal Light, Photometry, Sun, Scattering, Brightness

Scientific paper

Observational data are compared on the distribution of very small micrometeoroids (1 billionth to 1 hundred-millionth g), the scattering source function of the zodiacal light, the distribution of larger micrometeoroids (at least 1 hundred-thousandth g) as observed from Helios A and Pioneer 10, and the distribution of meteoroids from the sample seen from earth. The experiments, analyses, and simulations involved in obtaining these data are described in detail. It is shown that the various groups of data can be reconciled only by small albedos that decrease outward from 0.1 to at least about 3.3 AU for the particles which produce both the zodiacal light and the observed meteors. The results also indicate that there must be a maximum in the distribution of the larger particles somewhere between the orbits of earth and Jupiter. It is suggested that a search for fireballs in Jupiter's atmosphere by the television cameras of the MJS 77 mission should aid in locating this maximum.

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