Interception of comets and asteroids on collision course with Earth
Abstract
I derive expressions for the weight and range of applicability of interceptors capable of deflecting a comet or asteroid on collision course with Earth. The expressions use a fairly general relationship between the energy deposited and the mass of material blown off the astral assailant. To assess the probability that the astral assailant will fracture, I also calculate the fraction of the astral assailant's mass that will be blown off. The interaction is calculated for both kinetic energy deflection and nuclear explosive deflection. In the nuclear explosive case, I calculate the interceptor mass and cratering effect for detonations above the surface and below the surface as well as directly on the surface of the astral assailant. Because of the wide range of densities and material properties that the astral assailant may possess, the principal value of this work is to show the relationships among the salient parameters of the problem.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 1992
 Bibcode:
 1992STIN...9224028S
 Keywords:

 Asteroids;
 Collision Avoidance;
 Comets;
 Earth (Planet);
 Interception;
 Meteorite Collisions;
 Cratering;
 Deflection;
 Nuclear Explosions;
 Astrophysics