Book contents
- Frontmatter
- Contents
- List of contributors
- Preface
- Acknowledgments
- Glossary
- 1 Recent progress in interpreting the nature of the near-Earth object population
- 2 Earth impactors: orbital characteristics and warning times
- 3 The role of radar in predicting and preventing asteroid and comet collisions with Earth
- 4 Interior structures for asteroids and cometary nuclei
- 5 What we know and don't know about surfaces of potentially hazardous small bodies
- 6 About deflecting asteroids and comets
- 7 Scientific requirements for understanding the near-Earth asteroid population
- 8 Physical properties of comets and asteroids inferred from fireball observations
- 9 Mitigation technologies and their requirements
- 10 Peering inside near-Earth objects with radio tomography
- 11 Seismological investigation of asteroid and comet interiors
- 12 Lander and penetrator science for near-Earth object mitigation studies
- 13 Optimal interception and deflection of Earth-approaching asteroids using low-thrust electric propulsion
- 14 Close proximity operations at small bodies: orbiting, hovering, and hopping
- 15 Mission operations in low-gravity regolith and dust
- 16 Impacts and the public: communicating the nature of the impact hazard
- 17 Towards a national program to remove the threat of hazardous NEOs
- Index
15 - Mission operations in low-gravity regolith and dust
Published online by Cambridge University Press: 12 October 2009
- Frontmatter
- Contents
- List of contributors
- Preface
- Acknowledgments
- Glossary
- 1 Recent progress in interpreting the nature of the near-Earth object population
- 2 Earth impactors: orbital characteristics and warning times
- 3 The role of radar in predicting and preventing asteroid and comet collisions with Earth
- 4 Interior structures for asteroids and cometary nuclei
- 5 What we know and don't know about surfaces of potentially hazardous small bodies
- 6 About deflecting asteroids and comets
- 7 Scientific requirements for understanding the near-Earth asteroid population
- 8 Physical properties of comets and asteroids inferred from fireball observations
- 9 Mitigation technologies and their requirements
- 10 Peering inside near-Earth objects with radio tomography
- 11 Seismological investigation of asteroid and comet interiors
- 12 Lander and penetrator science for near-Earth object mitigation studies
- 13 Optimal interception and deflection of Earth-approaching asteroids using low-thrust electric propulsion
- 14 Close proximity operations at small bodies: orbiting, hovering, and hopping
- 15 Mission operations in low-gravity regolith and dust
- 16 Impacts and the public: communicating the nature of the impact hazard
- 17 Towards a national program to remove the threat of hazardous NEOs
- Index
Summary
Introduction
The method to be used for mitigating the impact of an asteroid on Earth depends on the nature of the asteroid. A compact rock would react very differently to almost any violent mechanical event than would an object that consisted of unconsolidated dust and fragments. A water-rich, comet-like object would react very differently to laser heating than a completely hydrated object. Thus, impact mitigation begins with scientific investigation.
We have been investigating physical processes likely to be occurring on asteroids in connection with our efforts to understand the origin and history of meteorites and their relationship to asteroids. In this connection, we have been developing proposals for a near-Earth asteroid sample return mission called Hera (Sears et al. 2002c) (Fig. 15.1). Hera will visit three near-Earth asteroids, spend 3 months to 1 year in reconnaissance, and then nudge itself gently down to the surface to collect three samples from each asteroid at geologically significant sites (Britt et al. 2001). By returning weakly consolidated surface samples, the Hera mission will clarify many issues relating to the asteroid–meteorite connection and the origin and evolution of the solar system (Sears et al. 2001). In addition, interstellar grains in the samples will shed light on the relationship between our Sun and other stars.
The major challenge of the Hera mission is the design of the collector and this depends on a knowledge of the nature of the surface.
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- Information
- Mitigation of Hazardous Comets and Asteroids , pp. 337 - 352Publisher: Cambridge University PressPrint publication year: 2004
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