Mission BepiColombo Huit ans de vol, une expérience: des manœuvres à haut risque sur Mercure

The European Space Agency’s BepiColombo mission has reached a pivotal moment after eight years of flight. On September 3, 2026, hundreds of scientists across Europe will hold their breath as a high-risk maneuver determines whether the mission will succeed in its ambitious goals. The spacecraft, which has traveled millions of kilometers through space, is set to separate from its carrier module, marking the beginning of its complex orbital insertion around Mercury. This critical step could determine whether the mission can unlock long-standing mysteries about the smallest planet in our solar system. The BepiColombo mission represents a groundbreaking effort in planetary exploration. For the first time, the ESA has launched two spacecraft, developed in collaboration with Japan, to orbit Mercury simultaneously and study it from different perspectives. This dual approach allows researchers to gather correlated data from multiple vantage points, enabling more accurate scientific analysis than ever before. The spacecraft have spent eight years traveling through the solar system, navigating gravitational assists and adjusting trajectories to finally reach their target. The maneuver scheduled for September 3 involves separating the spacecraft from the carrier module, a process fraught with risk. Once released, the twin probes must independently decelerate and enter Mercury’s orbit using their onboard propulsion systems. The operation requires precision, as even minor deviations could lead to catastrophic failure. According to ESA officials, this moment is akin to launching a new spacecraft while already in motion near another planet, a scenario that demands flawless execution. Operating conditions around Mercury are extreme. Surface temperatures can exceed 450 degrees Celsius, and the spacecraft must endure intense solar radiation. The solar panels aboard the European probe require careful alignment during separation to avoid damage from excessive sunlight. Engineers describe the situation as working under the constant heat of a powerful oven behind them. The challenge is compounded by the need to maintain communication and control over the delicate maneuver. In preparation for this critical phase, the mission team has trained extensively for potential scenarios. Over the past months, simulations focused exclusively on problem-solving, ensuring that all possible contingencies are addressed. The actual separation is set to begin at 14:00 local time, followed by a two-hour radio silence during which engineers will wait anxiously for confirmation of success. The outcome will not only affect the immediate future of the mission but also shape the trajectory of planetary science for years to come. If successful, the twin spacecraft will operate together until December 2026, collecting data on Mercury’s surface, magnetic field, and internal structure. They will then proceed to fly separately, each observing the planet from distinct angles. This dual observation strategy enables scientists to address fundamental questions about planetary formation, such as how planets form so close to their stars and why Mercury is unusually massive for its size. Researchers hope these insights will shed light on the early history of the solar system and provide clues about Earth’s origins. The mission includes over a dozen scientific instruments designed to unravel these mysteries. Among them are tools capable of measuring the planet’s gravity, mapping its topography, and analyzing its composition. These devices will help answer key questions, including how Mercury retains such a strong magnetic field despite lacking a substantial atmosphere and what role the planet’s proximity to the Sun plays in its evolution. For those wishing to follow the maneuver live, the ESA offers a dedicated livestream starting at 13:45 local time on September 3. This public engagement reflects the broader significance of the mission, which combines cutting-edge technology with international cooperation. As the spacecraft prepare to enter their final phase, the world watches with anticipation, knowing that the results of this daring endeavor could reshape our understanding of the cosmos.