Hera Spacecraft Nears Asteroid Dimorphos After Maneuver
The ESA probe is on track for a November 2026 arrival to assess the structural aftermath of the 2022 DART impact mission.
Updated on Oct. 25, 2026 in Space
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The European Space Agency has completed its second braking maneuver for the Hera spacecraft, firing its thrusters for 31 minutes to reduce speed. This operation, performed at a distance of 2,300 kilometers, brings the spacecraft closer to its November 2026 arrival at the Dimorphos asteroid system.
Why it matters
Hera is designed to conduct a detailed post-impact survey of the asteroid Dimorphos, following NASA's 2022 DART mission. This proximity research is essential for understanding the long-term structural effects of kinetic impact on planetary defense targets.
The second braking maneuver successfully reduced Hera's velocity by 70 meters per second, leaving the craft with a current cruise velocity of 20 meters per second. This follows an initial 93-minute burn on October 15, 2026, aimed at refining the rendezvous trajectory.
The players
European Space Agency
An intergovernmental organization dedicated to space exploration, known for developing complex rendezvous missions and planetary defense probes.
NASA
The United States federal agency responsible for the civil space program and the 2022 DART mission that first impacted Dimorphos.
The details
Hera adjusts its orbital approach by firing its onboard thrusters to shed excess kinetic energy, allowing the craft to match the velocity of its target. The 31-minute maneuver was split into two sessions: a 90 percent burn in the morning for trajectory adjustment followed by a afternoon performance cross-check. Once it reaches the 160-to-170-meter asteroid, the craft will deploy two CubeSats—small, low-cost satellites built to modular specifications—named Juventas and Milani to gather high-resolution surface data.
Timeline
October 15, 2026: Hera completed its first 93-minute braking maneuver.
October 22, 2026: The spacecraft finished its second 31-minute braking burn.
The week of October 22, 2026: Three additional transition maneuvers are scheduled to fine-tune the approach.
November 2026: The Hera spacecraft is expected to arrive at the Dimorphos system.
The Tech Race
Hera follows the 2022 DART asteroid impact by serving as the primary diagnostic tool for planetary defense validation. It marks the first deep-space mission to return to a previously impacted asteroid to measure physical changes directly.
The data collected by Hera will be publicly analyzed to refine international models for planetary defense against near-Earth objects. Scientists and space enthusiasts can look forward to the mission's arrival in November 2026, when the first high-resolution imagery of the DART impact site will become available.
The takeaway
Hera represents a critical step in quantifying the physical outcomes of asteroid kinetic deflection techniques. Keep watch for the arrival in November 2026, which will provide the first direct ground-truth measurements of the DART impact crater.
What happens next
The European Space Agency has scheduled three transition maneuvers throughout the current week to finalize the spacecraft's trajectory toward the Dimorphos asteroid system.
Further reading
For broader updates on planetary exploration and deep-space missions, see our latest coverage in Space.
Source note: This article includes information reported by Starlust.
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