“At 05:44:36 UTC the projectile made an oblique impact on the day-side of the comet, striking near the edge of one of the two craters. The release of kinetic energy was equivalent to detonating 4,500 kg of TNT. As a result, the comet was slowed by an estimated 0.0001 m/s and its perihelion distance was reduce by some 10 meters.”