Other
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..763l&link_type=abstract
Lunar and Planetary Science, volume 27, page 763
Other
3
Comets, Interplanetary Dust Particles, Sources Of Cpa Idps
Scientific paper
In the all sky survey by the Infrared Astronomical Satellite in 1983, eight comets were discovered to have dust trails. Among those eight comets, the most prominent trail belonged to Tempel 2, suggesting that this comet recently has been a most prolific producer of interplanetary dust. Numerical simulations that we have carried out of the orbital evolution of 4 and 9 micron diameter dust particles from Tempel 2 shows that radiation pressure causes a significant fraction of dust particles in this size range to be directly injected into a 1:2 interior mean motion resonance with Jupiter. There, they remain trapped for thousands of years. When they escape the resonance, their orbital eccentricities are usually quite small. These, and dust grains from other similar Tempel-type comets, approach the Earth with the low velocities typical of asteroidal dust grains. A sub-group of chondritic porous aggregate (CPA) interplanetary dust particles (IDP's) that were collected from stratosphere has been shown to have undergone little heating upon entry into the Earth's atmosphere. It is possible that this sub-group of grains derive from Tempel-type comets, and not from asteroids.
Liou Jer-Chyi
Zook Herbert A.
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