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After 8 years, Europe's BepiColombo mission is on final approach to Mercury
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Europe's BepiColombo spacecraft has reached a critical milestone after eight years of interplanetary travel, successfully jettisoning its propulsion module as it makes its final approach to Mercury. The mission, a nearly $2 billion international effort led by the European Space Agency with contributions from Japan and the United States, is now just months away from entering orbit around the Solar System's innermost planet.
Launched in 2018, BepiColombo has utilized a combination of advanced plasma propulsion and a series of nine gravity-assist flybys past Earth, Venus, and Mercury itself to gradually adjust its trajectory. This intricate path was necessary because reaching Mercury and entering its orbit demands more energy, or delta-v, than sending a probe to fly by distant Pluto. The spacecraft carried the most powerful electric propulsion system ever used in deep space.
On Thursday, the spacecraft jettisoned the Mercury Transfer Module, the section housing the four gridded ion thrusters that powered it through the cruise phase. This successful separation marks the end of the propulsion stage, leaving the scientific orbiter ready for its final capture. The next time BepiColombo encounters Mercury, it will be traveling at the precise velocity needed for the planet's gravity to pull it into orbit.
This maneuver is the culmination of an unprecedented trajectory design involving nine planetary flybys. Scientists on interplanetary missions are accustomed to long development and travel times, but BepiColombo's path highlights the unique challenges of exploring the swift-moving Mercury. The mission's success so far demonstrates sophisticated orbital mechanics and international collaboration.
Once in orbit later this year, BepiColombo will begin its primary science mission. It will carry a suite of instruments to study Mercury's surface, interior structure, magnetic field, and exosphere. The data collected is expected to solve fundamental questions about the planet's formation and evolution, providing unprecedented insights into the formation of our Solar System.
The successful module jettison is a pivotal step towards these scientific goals. It confirms the spacecraft is correctly configured for orbit insertion. With its long cruise phase now complete, the mission team is preparing for the critical braking maneuver that will secure BepiColombo as a new permanent observer of the scorched iron world.
