Asteroid showers on Earth after family breakup events

被引：103

作者：

Zappala, V ^{[1
]}

Cellino, A

Gladman, BJ

Manley, S

Migliorini, F

机构：

[1] Astron Observ Torino, Pino Torinese, TO, Italy

[2] Canadian Inst Theoret Astrophys, Toronto, ON M5S 1A1, Canada

[3] Armagh Observ, Armagh BT61 9DG, North Ireland

来源：

ICARUS | 1998年 / 134卷 / 01期

关键词：

D O I：

10.1006/icar.1998.5946

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The fate of a fraction of the near-Earth asteroid (NEA) population is to collide with terrestrial planets. Collisional events in the main asteroid belt provide a source of NEAs. We provide the first quantitative evaluation of the numbers of impactors produced in different size ranges by some events which produced recognized asteroid families in the main belt. Following certain family-forming events large enhancements in the rate of Earth impacts likely occurred, In the form of "asteroid showers" lasting 2-30 Myr, capable of influencing the Earth's biosphere. Such a shower could also be responsible of the hypothesized "lunar cataclysm" 4 Gyr ago. Because the number of NEAs is strongly affected by such events, the NEA population cannot always remain in a steady state. (C) 1998 Academic Press

引用

页码：176 / 179

页数：4

共 25 条

[1] The age of the Popigai impact event and its relation to events at the Eocene/Oligocene boundary [J].