BepiColombo Frees Spacecraft for Mercury Arrival
The separation starts the final approach, with two spacecraft planned to enter Mercury orbit in December 2026.
Updated on Nov. 4, 2026 in Space
BepiColombo, the joint European-Japanese mission to Mercury, has separated its Mercury Transfer Module (MTM) from the spacecraft, a step the mission team describes as the first in a sequence of key manoeuvres. The separation was confirmed by acquisition of signal from ESA's mission control centre in Darmstadt, Germany. This is an operational milestone in a mission that is already in flight, not a new technology demonstration.
Why it matters
The separation marks the transition from the cruise phase, in which the Mercury Transfer Module provided power and solar electric propulsion across the inner Solar System, to the mission's arrival sequence. Planetary arrival at Mercury is one of the most complex sequences ESA has attempted, and each stage now depends on the spacecraft performing as planned.
The mission has covered 9.9 billion kilometres and completed nine planetary flybys, figures reported by ESA for the journey to date. The source does not give comparator values or performance benchmarks for the Mercury Transfer Module, and the remaining manoeuvres have not been quantified.
The players
European Space Agency (ESA)
Europe's space agency, which leads BepiColombo jointly with JAXA and runs the mission control centre in Darmstadt, Germany.
The details
BepiColombo is a combined ESA and JAXA mission that travelled to Mercury in a stack of two spacecraft. The Mercury Transfer Module is the carrier stage that supplied power and solar electric propulsion, a thruster type that uses electricity from solar panels to accelerate ion exhaust, while the spacecraft travelled through the inner Solar System. Its separation releases the two Mercury-bound spacecraft for the final approach, which is a sequence of manoeuvres where the spacecraft must slow precisely enough to be captured by Mercury's gravity.
Timeline
Over the last eight years: BepiColombo travelled through the inner Solar System.
4 November 2026: The Mercury Transfer Module was separated, and the milestone was celebrated at Darmstadt.
December 2026: Two spacecraft are planned to be placed into orbit around Mercury.
The Tech Race
BepiColombo is a joint European-Japanese mission, and its planned December 2026 arrival would make it the first to place two spacecraft in orbit around Mercury. The source does not compare the mission against competing Mercury efforts or other planetary missions.
This milestone affects no product or service available to the public today, and the source gives no availability or pricing information. Its practical relevance is to the scientific community, whose Mercury data depends on the success of the December 2026 orbit insertion.
The takeaway
The separation is the first of a sequence of manoeuvres that will decide whether two spacecraft reach orbit around Mercury. Watch for ESA's report on the December 2026 orbit insertion, which will confirm or contradict the mission's planned arrival.
What happens next
BepiColombo is scheduled to attempt placing two spacecraft into orbit around Mercury in December 2026, which is the next dated milestone in the mission.
Further reading
Follow the latest developments in Space, where BepiColombo's approach to Mercury sits within the wider exploration of the inner Solar System.
