Optimal deflection of NEOs en route of collision with the Earth

Details Optimal deflection of NEOs en route of collision with the Earth Optimal deflection of NEOs en route of collision with the Earth

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006icar..182..482k&link_type=abstract

Icarus, Volume 182, Issue 2, p. 482-488.

Computer Science

3

Scientific paper

Recently, a method for the n-body analysis of the velocity change required to deflect a hazardous near-Earth object (NEO) was presented by Carusi et al. [Carusi, A., Valsecchi, G.B., D'Abramo, G., Boattini A., 2002. Icarus 159, 417 422]. We extent this method in order to optimize the velocity change vector instead of its along-track magnitude. From an application of both methods to a fictitious NEO we find Carusi's parallel approach to be reasonable for phases of unperturbed two-body motion. But, for orbit phases inhering third-body perturbations, i.e., for planetary close approaches or prior to a collision, the results obtained from the new method show the radial component of deflection impulse to play a major role. We show that a fivefold greater efficiency can be achieved by a deflection impulse being non-parallel to orbital velocity. The new method is applied to two possible 99942 Apophis impact trajectories in order to provide constraints for future Apophis deflection mission analysis.

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