The NASA DART mission has proven our ability to deflect asteroids to protect the Earth from potential collisions. A recent discovery also shows that by impacting an asteroid’s moon, we can alter the trajectory of the entire space system.
In September 2022, NASA’s DART probe intentionally collided with the small moon Dimorphos. The goal was clear: to test our ability to deflect an asteroid to protect Earth from an impact. The success was total, as the orbit of this 160-meter moon was shortened by 33 minutes.
33 MINUTES? IS THAT A LOT?
This result is much more significant than scientists initially hoped for. Additionally, a new study reveals an even broader effect. By striking the small moon, the probe also altered the course of the main asteroid, Didymos. Its 770-day orbit around the sun was shortened by 0.15 seconds, a scientific first. This discovery demonstrates the ability to change the trajectory of a giant asteroid by targeting its satellite, adding a valuable strategic option to react effectively in the face of a real space threat.
AND THEN?
To further explore this, a new European mission called Hera will take over. It will join the asteroid duo to precisely analyze the consequences of the 2022 impact. Two mini-satellites, Juventus and Milani, will be deployed to scrutinize every detail of the collision. CNES in Toulouse will play a crucial role in guiding their trajectories and scientific instruments.
For more information visit the website by Olivier Sanguy from La Cité de l’Espace.
