دورية
Origin of the Spacewatch Small Earth-Approaching Asteroids
| العنوان: | Origin of the Spacewatch Small Earth-Approaching Asteroids |
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| المؤلفون: | Bottke, William F., Nolan, Michael C., Melosh, H.J., Vickery, Ann M., Greenberg, Richard |
| المصدر: | Icarus; August 1996, Vol. 122 Issue: 2 p406-427, 22p |
| مستخلص: | Recent discoveries of small Earth-approaching asteroids by the 0.9 m Spacewatch telescope (referred to here as S-SEAs) reveal 16 objects which have diameters ∼50 m or smaller. Approximately half of these objects lie in a region where few large near-Earth asteroids are found, with perihelia (q) and aphelia (Q) near 1 AU,e< 0.35, andifrom 0° to ∼30°. Possible origins for these objects are examined by tracking the orbital evolution of test bodies from several possible source regions using an Öpik-type Monte Carlo dynamical evolution code, modified to include (a) impact disruption, based on a map in orbital (a,e,i) space of collision probabilities and mean impact velocities determined using actual main-belt and near-Earth asteroid orbits, (b) fragmentation, and (c) observational selection effects. |
| قاعدة البيانات: | Supplemental Index |
Full Text Finder | تدمد: | 00191035 10902643 |
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| DOI: | 10.1006/icar.1996.0133 |