Spacecraft bound for Mercury begins 'tricky' arrival

On Thursday, the BepiColombo spacecraft, carrying European and Japanese probes, commenced its perilous approach to Mercury, embarking on a month-long, high-risk mission. Launched in 2018, the spacecraft traveled over 10 billion kilometers, making nine flybys to alter its trajectory. Its primary objective is to deploy the two probes into Mercury's orbit, with mission managers describing the arrival as the most operationally challenging ever attempted.

Mercury's weak gravitational pull, due to its small mass, poses a significant challenge for approach. The spacecraft had to travel more than 10 billion kilometers, separating from a transfer module after an eight-year journey. This separation, occurring 200 million kilometers from Earth, was executed autonomously due to the 30-minute delay between ground commands and the spacecraft's actions.

The probes, attached together, successfully detached from the transfer module, with the spacecraft autonomously releasing them using spring mechanisms. The separation took place at a speed of 40 centimeters per second. Due to the vast distance, confirmation of the operation's success reached the control center in Darmstadt, Germany, nearly two hours later.

The probes are expected to enter Mercury's orbit on November 21. The next challenging phase will be on December 9 and 10, when the orbiters will separate into their distinct orbits. From April, the European Space Agency's Mercury Planetary Orbiter will begin its detailed study of the planet, passing as close as 480 km from its surface. The Japanese Mercury Magnetospheric Orbiter will focus on the space environment and magnetic field, with an elliptical orbit extending up to 11,000 km away.

Mercury, the least explored of the innermost planets, holds many mysteries, including its magnetic field, iron core, and surface characterized by hollows. With its 16 instruments and a budget of 1.7 billion euros, BepiColombo promises unprecedented views of Mercury, opening a new chapter in our understanding of the solar system.