BepiColombo Mission Jettisons Propulsion Module, Nearing Mercury Orbit After Eight Years

Final Approach to Mercury

The BepiColombo mission has reached a significant milestone in its eight-year journey to Mercury. The spacecraft recently jettisoned its Mercury Transfer Module, which housed the ion thrusters and provided power and propulsion for the interplanetary cruise. This action indicates the mission is now in its final phase before attempting orbit insertion.

Complex Journey to the Inner Planet

Launched in 2018, BepiColombo has navigated the solar system using a combination of plasma propulsion and nine planetary flybys, including Earth, Venus, and Mercury itself. These maneuvers were essential to adjust the spacecraft's velocity and trajectory, enabling it to eventually be captured by Mercury's gravity. Traveling to Mercury and entering orbit requires more energy than reaching distant planets like Pluto.

Advanced Propulsion System

The mission utilized the most powerful electric propulsion system ever deployed in deep space, featuring four gridded ion thrusters. This system was crucial for reshaping BepiColombo's orbit around the Sun between flybys. With the Mercury Transfer Module now separated, the spacecraft is prepared for the final orbital insertion sequence.

Anticipated Orbit Insertion

Scientists anticipate BepiColombo will achieve orbit around Mercury later this year. This event will mark the culmination of years of planning and execution, allowing the mission to begin its scientific observations of the innermost planet. The mission is a collaborative effort led by the European Space Agency, with contributions from Japan and the United States, and carries a price tag of nearly $2 billion.