After eight years traveling together through the inner Solar System, a critical piece of the BepiColombo spacecraft detached from the rest on September 3, 2026, setting off one of the most intricate planetary arrival sequences ever attempted by the European Space Agency. The separation of the Mercury Transfer Module (MTM) from the stacked spacecraft marked the first concrete step toward entering orbit around Mercury, the smallest and least explored rocky planet in our neighborhood.
A live view from mission control in Germany
The event unfolded in front of a global audience during a livestream broadcast from ESA's European Space Operations Centre (ESOC) in Darmstadt, Germany. Viewers saw the iconic Main Control Room, heard expert commentary, and got behind-the-scenes looks at what it takes to guide a spacecraft that has spent nearly a decade flying through the inner Solar System. The first signal from the spacecraft after separation came at 15:53 CEST, the earliest possible moment mission teams expected to hear from BepiColombo.
Why the separation matters for reaching Mercury
BepiColombo is a joint mission between ESA and the Japan Aerospace Exploration Agency (JAXA). The MTM had been the workhorse pushing the spacecraft toward its destination, using solar electric propulsion to gradually reshape its orbit around the Sun. With that job done, the module was no longer needed. Its separation allows the remaining spacecraft stack, which includes two science orbiters, to proceed with the delicate maneuvers required to be captured by Mercury's gravity. Local residents in Darmstadt and space enthusiasts worldwide tuned in because this was not just a routine milestone. It was the beginning of a sequence that will determine whether the mission can ultimately study Mercury's composition, magnetic field, and exosphere up close.
The livestream schedule showed the careful pacing of the event: separation at 14:00 CEST, a pause in coverage, then a resume at 15:30 as teams awaited the crucial signal confirming the spacecraft was healthy. The broadcast ended at 16:45 CEST, but the work was just starting. The arrival sequence will continue over the coming weeks, with each step bringing BepiColombo closer to a planet that has only been visited by two other missions before. For the scientists and engineers who have waited years for this moment, the separation was proof that the mission's most challenging phase had finally begun.
