Asteroids approaching the earth from directions around the sun

被引：4

作者：

Isobe, S ^{[1
]}

Yoshikawa, M ^{[1
]}

机构：

[1] COMMUN RES LABS, KASHIMA, IBARAKI 314, JAPAN

来源：

EARTH MOON AND PLANETS | 1996年 / 72卷 / 1-3期

关键词：

D O I：

10.1007/BF00117527

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have estimated close asteroid encounters with the Earth by numerical integrations of a system with the Sun, 9 planets, and 188 near-earth-asteroids during the period 1994-4600. Asteroids approach the Earth from directions within 30 degrees around the Sun in more than 20% of encounters with the closest distance less than 0.01 AU. Since groundbased observations cannot detect these objects, we should develop space-borne and/or lunar observatories in a short time to allow enough warning time before a catastrophic collision.

引用

页码：263 / 266

页数：4

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