ESA Will Launch Hera Probe to Asteroid in October 2026
The mission will investigate the aftermath of the DART collision to refine planetary defense capabilities.
Updated on Sept. 28, 2026 in Space
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The European Space Agency has scheduled the launch of its 363 million euro Hera probe for 7 October 2026, marking a follow-up to the 2022 DART impact. The mission aims to survey the asteroid Dimorphos to determine the long-term effectiveness of kinetic impactors for planetary defense.
Why it matters
Understanding the structural changes caused by the DART collision is essential for developing methods to deflect hazardous near-Earth objects. This investigation informs future planetary defense strategies against asteroids roughly 140 metres wide, which strike Earth approximately every 20,000 years.
The Hera spacecraft carries 12 scientific instruments and two nanosatellites to probe the asteroid, which sits 11 million kilometres from Earth. One nanosatellite, Juventas, will deploy radar and a gravimeter to measure the internal density of Dimorphos.
The players
European Space Agency
An intergovernmental organization focused on space exploration, Earth observation, and launch vehicle development.
SpaceX
A private aerospace manufacturer and space transport company providing launch services via the Falcon 9 rocket.
The details
The Hera spacecraft is designed to conduct a post-impact characterization of the collision site where the DART mission impacted Dimorphos in 2022. The Juventas nanosatellite — a miniature satellite used for specialized proximity operations — will utilize radar to peer beneath the surface and a gravimeter to determine the asteroid's mass distribution. These measurements allow researchers to calculate the internal structure of the asteroid, which remains unknown following the initial kinetic impact.
Timeline
2022: DART spacecraft crashed into asteroid Dimorphos.
7 October 2026: Scheduled launch date for the Hera probe.
27 October 2026: End of mission launch window.
December 2026: Hera expected arrival at Dimorphos.
2027: Hera scheduled flyby of Mars.
The Tech Race
Hera extends the trajectory established by the DART mission to transform theoretical planetary defense into an empirical science. While DART proved kinetic impact can alter an asteroid's trajectory, Hera is the first dedicated mission to characterize the specific physical outcome of such a collision.
The mission provides the data necessary to protect against the roughly 60% of 140-metre asteroids that remain unidentified. These findings serve as the foundation for future global policy on planetary defense and potential emergency interception protocols.
The takeaway
Hera will reveal how efficiently we can reshape an asteroid, moving us toward a verifiable defense against celestial impacts. Monitor the ESA mission updates leading up to the 7 October 2026 launch window for confirmation of the Falcon 9 launch readiness.
Further reading
For more on the trajectory of orbital exploration and asteroid studies, visit the Space section.
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