Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279..646k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 2, p. 646-660
Astronomy and Astrophysics
Astronomy
47
Comets, Infrared Astronomy, Interplanetary Dust, Meteoroid Showers, Solar Orbits, Spatial Distribution, Infrared Astronomy Satellite, Perihelions, Spaceborne Astronomy
Scientific paper
Meteor storms recorded during the last two centuries and cometary dust trails detected by the IRAS mission are compared with the spatial distribution, orbital evolution, and relative dust production of all known periodic comets. It is shown that these two phenomena are exactly of the same nature, origin and evolution. Their parents are mainly active members of the Jupiter family of comets, situated on both sides of the 2:1 resonance gap, which were not subject to closer encounters with Jupiter for several revolutions. The survival times of these compact dust streams are typically about 60 years, and the ages of the particles forming them are still lower. Their formation, progressive asymmetric extension and disappearance indicates ejection velocities up to 5 m/s, and solar radiation pressure to solar gravity ratio of 10-3. The Earth enters regions with particle density 100-times above the sporadic background about once per century, for less than an hour. This corresponds to a passage slightly outside the boundary of an IRAS cometary dust trail. Available data on the orbits, past perturbing planetary encounters, and absolute total brightness of the potential parent comets make it possible to predict the appearance of meteor storms, and especially of detectable infrared dust trails, with a relatively high degree of confidence.
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