# BepiColombo Spacecraft Nears Mercury After 8-Year Journey ESA-JAXA mission prepares for unprecedented dual-orbit Mercury study. - **Source:** [Science Latest](https://brifing.si/source/ebc20f22-8d1a-4ae4-ba4c-efcd0853ba19) - **Published:** 2026-09-21 - **Topic:** [Business](https://brifing.si/c/business) - **Original article:** - **On Brifing:** https://brifing.si/s/dca695f7-5f9f-474f-a30c-e69328421186 ## Delayed Mercury arrival BepiColombo's journey to Mercury faced a one-year delay due to propulsion system issues, forcing mission controllers to replan the trajectory using reduced power. The spacecraft, named after gravity assist pioneer Giuseppe Colombo, finally began its descent after eight years in space. This marks Europe and Japan's first Mercury orbiter mission, joining only two previous NASA probes that studied the innermost planet. ## Complex orbital mechanics Reaching Mercury requires counterintuitive navigation - spacecraft must burn fuel to brake against the Sun's gravity rather than accelerate. BepiColombo traveled 9.9 billion km using nine gravity assists from Earth, Venus, and Mercury itself. These maneuvers precisely controlled velocity while conserving fuel, demonstrating advanced astrodynamics for inner solar system exploration. ## Extreme environmental challenges Mercury presents brutal temperature swings from 430°C to -180°C daily, with no atmospheric protection. BepiColombo's design incorporates special insulation and heat-resistant materials to survive these conditions. The mission must also account for intense solar radiation and gravitational perturbations from the nearby Sun during operations. ## Dual spacecraft separation The composite spacecraft successfully separated into two orbiters on September 3: MPO for surface studies and Mio for magnetic field analysis. This first-ever dual Mercury orbit enables simultaneous measurements from different altitudes. MPO will eventually descend to 480-1500 km altitude, while Mio maintains an elliptical polar orbit up to 11,640 km. ## Scientific objectives BepiColombo aims to solve Mercury's mysteries: its oversized iron core, polar ice deposits, and unique magnetic field among rocky planets. The mission will study surface 'hollows' and test Einstein's relativity theory using precise orbital measurements. These findings could reshape understanding of terrestrial planet formation and solar system evolution. ## Extended preparation phase Despite reaching final orbits by March 2027, full science operations won't begin until April 2027. This 13-month commissioning period includes deploying Mio's crucial sunshield and calibrating instruments. The deliberate timeline ensures optimal conditions for the planned one-year observation period, with possible extensions. ## International collaboration The €1.3 billion mission combines ESA's MPO with JAXA's Mio, showcasing global space partnership. ESA handles spacecraft operations while JAXA leads magnetic field investigations. Shared data will create the most comprehensive Mercury dataset yet, with findings distributed across 16 participating countries' research institutions. ## Planetary science implications As the least explored terrestrial planet, Mercury holds keys to understanding planetary differentiation and magnetic field generation. BepiColombo's simultaneous multi-point measurements will provide unprecedented context about solar wind interactions and surface composition. These insights may explain why Mercury differs fundamentally from other rocky worlds. ## Sources covering this story - https://www.wired.com/story/after-8-years-in-space-bepicolombo-finally-approaching-mercury/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._