Japan’s Hayabusa2 spacecraft, which already pulled off a historic sample return from a distant asteroid, is now preparing for a far more aggressive move: ramming into a space rock to change its course.
The mission would make Japan only the second country to attempt asteroid deflection, after NASA’s DART spacecraft successfully knocked an asteroid off its orbit in 2022. But Hayabusa2’s approach is different, and the stakes are just as high.
A second shot at asteroid defense
Hayabusa2 launched in 2014 and spent years exploring the asteroid Ryugu, collecting samples and dropping them back to Earth in 2020. Now the Japan Aerospace Exploration Agency (JAXA) wants to send the spacecraft toward a new target: a small asteroid named 1998 KY26.
The plan is not just to visit. Hayabusa2 will attempt to collide with the asteroid at high speed, aiming to alter its trajectory. The test is part of a broader push to develop reliable ways to protect Earth from a potential future impact.
Why this asteroid and why now
1998 KY26 is a fast-spinning, water-rich asteroid about 30 meters in diameter. It orbits the Sun every 2.4 years and passes relatively close to Earth. Scientists chose it because its composition and size make it a good stand in for the kind of asteroid that could one day threaten the planet.
JAXA plans to launch the mission in the late 2020s, with the impact expected in 2031. The spacecraft will carry a small lander and an explosive device to study the asteroid’s interior before the collision.
What local communities and scientists are watching
In Japan, the mission has drawn attention from both the public and the scientific community. Many see it as a natural next step after Hayabusa2’s earlier success. The mission also carries national pride: Japan has become a leader in asteroid science, and this test could cement its role in planetary defense.
Researchers in Japan and abroad are eager to see how the deflection technique compares with NASA’s DART method. DART used a kinetic impactor, hitting the asteroid Dimorphos head on. Hayabusa2 will use a similar approach but with a smaller spacecraft and a different asteroid type. The results could help scientists understand which methods work best for different kinds of space rocks.
A quiet step toward protecting the planet
No asteroid currently poses a known threat to Earth. But the work being done by JAXA and NASA is preparing for a day when one might. Each test adds data that could one day save lives.
Hayabusa2’s deflection attempt will not be the last. But it will be one of the most carefully watched, because it comes from a country that has already proven it can touch an asteroid and bring a piece of it home.
