On the consequences of a fragmentation due to a NEO mitigation strategy

J.P. Sanchez Cuartielles, M. Vasile, G. Radice

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Abstract

The fragmentation of an Earth threatening asteroid as a result of a hazard mitigation mission is examined in this paper. The minimum required energy for a successful impulsive deflection of a threatening object is computed and compared with the energy required to break-up a small size asteroid. The fragmentation of an asteroid that underwent an impulsive deflection such as a kinetic impact or a nuclear explosion is a very plausible outcome in the light of this work. Thus a model describing the stochastic evolution of the cloud of fragments is described. The stochasticity of the fragmentation is given by a Gaussian probability distribution that describes the initial relative velocities of each fragment of the asteroid, while the size distribution is expressed through a power law function. The fragmentation model is applied to Apophis as illustrative example. If a barely catastrophic disruption (i.e. the largest fragment is half the size of the original asteroid) occurs 10 to 20 years prior to the Earth encounter only a reduction from 50% to 80% of the potential damage is achieved for the Apophis test case.
Original languageEnglish
Number of pages14
Publication statusPublished - 26 Sep 2008
Event59th International Astronautical Congress - Glasgow, Scotland
Duration: 29 Sep 20083 Oct 2008

Conference

Conference59th International Astronautical Congress
CityGlasgow, Scotland
Period29/09/083/10/08

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Keywords

  • near earth object
  • asteroids
  • mitigation stategy
  • kinetic impact
  • nuclear explosion
  • fragmentation
  • apophis test

Cite this

Sanchez Cuartielles, J. P., Vasile, M., & Radice, G. (2008). On the consequences of a fragmentation due to a NEO mitigation strategy. Paper presented at 59th International Astronautical Congress, Glasgow, Scotland, .