Meteors; Meteor showers; long period; Comets; dynamics; dust; Celestial mechanics
Abstract :
[en] What long-period comets with orbital periods >250 years cause detectable meteor showers on Earth? Low-light video cameras are used to track the motion of +4 to -5 magnitude meteors in our atmosphere by triangulation and calculate the meteoroid orbit in space. In recent years, the CAMS (Cameras for Allsky Meteor Surveillance) low-light video camera network was greatly expanded and, together with other video networks, now has increased the total video meteoroid orbit database to over 2.2 million orbits. Here, we searched this database for meteor showers associated with known long-period comets. Previously, five associations were known. Now, we find 14, as well as six uncertain but likely associations. These showers show a change of longitude of perihelion with node that is a strong function of inclination. Showers of longer duration show a steeper magnitude distribution index, presumably due to aging of the meteoroid population. Showers are generally detected only if the orbital period of the comet is less than 4000 years and the Earth-Comet orbital miss distance is ≤0.10 AU. The lack of an associated meteor shower sets lower limits on the orbital period of poorly observed comets.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Jenniskens, Peter; SETI Institute, 189 Bernardo Ave, Mountain View, CA 94043, USA ; NASA Ames Research Center, Moffett Field, CA 94035, USA
Lauretta, Dante S.; Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA
Towner, Martin C.; Space Science and Technology Centre, Curtin University, Perth, WA 6102, Australia
Heathcote, Steve; Cerro Tololo Inter-American Observatory, La Serena, Chile
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Hanke, Toni; High Energy Stereoscopic System Collaboration, Windhoek, Namibia
Cooper, Tim; Astronomical Society of Southern Africa, Bredell, South Africa
Baggaley, Jack W.; University of Canterbury, 20 Kirkwood Ave, Christchurch 8041, New Zealand
Howell, J. Andreas; CAMS Florida, Gainesville, FL 32605, USA
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