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BepiColombo: A Mission to the HELL of a Planet, Mercury

Launched in October 2018, BepiColombo aims to explore Mercury, the smallest and least explored terrestrial planet in our Solar System. This mission is crucial not only for understanding Mercury itself but also for shedding light on the formation and evolution of our Solar System.

BepiColombo: A Mission to the HELL of a Planet, Mercury

Monday May 27, 2024 , 4 min Read

The BepiColombo mission, a joint endeavor by the European Space Agency (ESA) and the Japan Aerospace Exploration Agency (JAXA), is one of the most ambitious and technically challenging space missions ever undertaken.

BepiColombo’s journey to Mercury is far from straightforward. The spacecraft must navigate the intense gravitational pull of the Sun, requiring a complex series of flybys to gradually slow down and position itself for orbital insertion around Mercury. To date, BepiColombo has performed multiple flybys, including one of Earth, two of Venus, and three of Mercury. These maneuvers help the spacecraft lose energy and avoid being pulled into the Sun's gravity well.

The mission's state-of-the-art solar electric propulsion system is designed to operate for an astounding 15,000 hours, enabling the spacecraft to make the necessary flybys and course corrections. By the time BepiColombo reaches its final destination in December 2025, it will have traveled a total of seven years and executed nine planetary flybys​​.

Scientific Goals and Early Discoveries

bepi

The scientific goals of BepiColombo are as bold as its journey. The mission comprises two main orbiters: the Mercury Planetary Orbiter (MPO) provided by ESA and the Mercury Magnetospheric Orbiter (Mio) provided by JAXA. Together, these orbiters will study Mercury’s surface, magnetic field, exosphere, and interior structure.

Early flybys have already yielded significant scientific data. For instance, during its flybys, BepiColombo has captured stunning images of Mercury's surface and provided insights into the planet's geological history. One notable discovery includes detailed images of the Manley Crater, named after the Jamaican artist Edna Manley. This crater, with its dark low reflectance material, may hold clues about Mercury’s ancient, carbon-rich crust and prolonged volcanic activity.

Another intriguing feature observed is the Beagle Rupes, one of Mercury’s many lobate scarps, which provide evidence of the planet’s tectonic history. These scarps likely formed as Mercury’s core cooled and contracted, causing the crust to wrinkle and buckle—a process somewhat akin to an apple drying out​.

Unveiling Mercury's Mysteries

Mercury, often referred to as the "hellish planet" due to its extreme temperatures and proximity to the Sun, has remained an enigma for scientists. BepiColombo’s mission is set to unlock many of these mysteries. Among the key scientific objectives is the study of Mercury's magnetic field. Unlike other terrestrial planets, Mercury has a magnetic field, though it is much weaker than Earth’s. Understanding this magnetic field could provide crucial insights into the planet's interior structure and its dynamo mechanism.

Additionally, BepiColombo aims to study the composition of Mercury’s exosphere, a tenuous layer of gases surrounding the planet. By analysing the exosphere, scientists hope to understand better the processes that release these gases from Mercury's surface and how they interact with the solar wind.

The Challenges of Exploring Mercury

mercury

Mercury's proximity to the Sun presents unique challenges for space missions. The intense solar radiation and heat make it difficult for spacecraft to operate. BepiColombo is equipped with a specially designed thermal control system to withstand these harsh conditions. The spacecraft’s orbiters are protected by multi-layer insulation and heat-resistant materials to ensure that sensitive instruments remain operational.

Moreover, the navigation and propulsion requirements for reaching Mercury are particularly demanding. The spacecraft must perform precise maneuvers to use the gravitational pull of other planets effectively. These gravity assists are essential to slow down BepiColombo enough to be captured by Mercury’s gravity, a delicate balance of speed and direction changes that require constant monitoring and adjustments.

Future Prospects and Legacy

As BepiColombo approaches its final orbital insertion around Mercury in December 2025, anticipation builds within the scientific community. The data collected by BepiColombo will build on the legacy of previous missions such as NASA's MESSENGER, which orbited Mercury from 2011 to 2015. MESSENGER’s discoveries, including evidence of water ice in permanently shadowed craters and extensive volcanic activity, have provided a foundation for BepiColombo’s more detailed studies​​.

In its final mission phase, BepiColombo’s two orbiters will work in a team to provide high-resolution images and data, offering an unprecedented view of Mercury’s surface and environment. This mission not only promises to deepen our understanding of Mercury but also to enhance our knowledge of planetary formation and the dynamics of the inner Solar System.


Edited by Rahul Bansal