We present orbital simulations comparing the effectiveness of both systems across a range of laser and asteroid parameters. Such a stand-on system would also permit directing the thrust in any desired direction through careful positioning of the laser relative to the asteroid. A much smaller version of the same system called DE-STARLITE travels alongside the target, operating in a stand-on mode, slowly deflecting it over a long period. The DE-STAR system provides such a thrust by illuminating an Earth-targeting asteroid or comet from afar with a stand-off system consisting of a large phased-array laser in Earth orbit. Laser ablation of a Near Earth Object (NEO) on a collision course with Earth produces a cloud of ejecta which exerts a thrust on the asteroid, deflecting it from its original trajectory. Small asteroids and comets can be diverted/evaporated with aĭESTAR 2 (100m) while space debris is vaporized with a DE-STAR 1 (10m). Sufficient to completely evaporate up to 500-m diameter asteroids in one A DE-STAR 4 allowsįor asteroid engagement starting beyond 1AU with a spot temperature The baseline system is a DE-STAR 3 or 4 (1-10kmĪrray) depending on the degree of protection desired. Surface ejecting evaporated material a large reaction force would alter Raise the surface spot temperature to ~3,000K, allowing direct The main objective of DE-STAR is to use the focused directed energy to Lowering cost, minimizing risk, and allowing for technologicalĬo-development, leading eventually to an orbiting structure that wouldīe developed in stages with both technological and target milestones. Modularĭesign allows for incremental development, test, and initial deployment, Phased array of kilowatt class lasers powered by photovoltaic's. System for Targeting of Asteroids and exploRation. We call the system DE-STAR for Directed Energy Hazardous objects to the vaporization point as a feasible approach to Planetary defense system capable of heating the surface of potentially Numerous risk mitigation strategies have been described, most involvingĭedicated missions to a threatening object. Impact, with potentially severe disturbances to Earth and society. Asteroids and comets that cross Earth's orbit pose a credible risk of