Not quite.<p>Considering an inelastic collision, the impact would dissipate roughly mv^2&#x2F;2 worth of energy, so...<p>1&#x2F;2 * 100kg * (10^8 m&#x2F;s)^2 = 5 * 10^17 Joules of kinetic energy.<p>In contrast, the amount of solar energy that impacts the Earth each second is 10^17 Joules.<p>For a more relevant comparison, the Tsar Bomba (50 megatons) released ~2*10^17 Joules. So, worst-case, the probe would cause the equivalent of a ~100 megaton explosion. Hardly a planet-killer.