In September 2022, NASA conducted an unprecedented experiment: the DART spacecraft deliberately collided with the asteroid Didymos to change its orbit. The mission was deemed a success — the trajectory of the space object really changed. It has been demonstrated that humanity already possesses the necessary technology to deflect potentially dangerous asteroids from their course toward Earth. However, new research points to an unexpected complication: such a strike may only delay the collision, rather than prevent it permanently.
Gravitational traps
As it turns out, the main danger is gravitational traps — small areas of space where the gravity of planets can radically change the orbit of an asteroid. If, as a result of the impact, the space rock enters one of these traps, its new path could send it on a direct course toward Earth, but in the future. This makes indiscriminate use of kinetic strike technology potentially risky, merely postponing the inevitable threat.
In search of the perfect place to strike
The answer to this challenge is not to abandon the technology, but to improve it. Scientists studying data from the DART mission are proposing a new approach. Instead of simply hitting the asteroid, it is necessary to calculate the optimal point of impact with the utmost precision.To do this, detailed data about the celestial body needs to be collected in advance: its shape, mass, surface type, rotation speed, and topography.
Based on this data, detailed probability arrays can be created that will show which part of the asteroid’s surface is safest for impact. A correctly calculated impulse in the right place will not only deflect the threat, but also ensure that the asteroid does not fall into a gravitational trap and permanently leaves its dangerous course toward Earth. Thus, future planetary defense missions will transform from brute force to precise “space billiards,” where every hit has to be calibrated.
Earlier, we reported on how the catastrophic consequences of the DART collision with an asteroid were observed from Earth.
According to eurekalert.org
