BepiColombo begins Mercury arrival with MTM separation success

During the last eight years, BepiColombo has travelled 9.9 billion kilometres by means of the inside Photo voltaic System and accomplished 9 planetary flybys to succeed in this historic milestone. Regardless of parting with the module, BepiColombo wouldn’t have made it this far with out MTM. It carried BepiColombo from Earth to Mercury, offering energy and the extremely superior photo voltaic electrical propulsion (SEP) wanted to navigate its complicated house journey. Now, MTM’s job is full.

This separation is the primary in a sequence of key manoeuvres that may in the end see BepiColombo develop into the primary mission to put two spacecraft in orbit round Mercury, in December 2026. The mission’s Mercury arrival part is among the most complicated planetary arrival sequences ever tried by ESA.

After an intense day of operations at ESA’s mission management centre in Darmstadt, Germany, ESA, trade companions and the mission’s scientific neighborhood celebrated the acquisition of sign confirming MTM’s profitable separation. 1000’s additionally adopted the milestone stay on ESA’s YouTube channel.

Letting go

Within the months main as much as MTM separation, rigorous simulations challenged the Mission Management Workforce (MCT) with a variety of operational eventualities. 

On 3 September 2026 got here the actual deal. At 12:00 CEST, the group gave the official “GO” for separation. For these within the Major Management Room, it marked the fruits of months of preparation.

Because the anticipated separation time arrived at 14:00 CEST, silence fell over mission management. The group must wait practically two hours for affirmation to reach from 200 million kilometres away.

Following separation, the remaining spacecraft stack entered secure mode, readjusted its perspective and reconfigured itself earlier than transmitting its standing again to Earth. 

At 14:20 CEST, a preliminary Doppler sign supplied the primary indication that separation had taken place. 

“We heard it loud and clear within the voice loop from Flight Dynamics Supervisor, Frank Budnik, that they may clearly see from the Doppler knowledge that MTM had separated. In any case this ready and preparation, all of us checked out one another and hugged. It was a really highly effective second,” says Emmanuela Bordoni, ESA BepiColombo B-shift Spacecraft Operations Supervisor.

With ESA’s Estrack Cebreros and Malargüe deep-space antennas locked on track, all eyes turned to the incoming telemetry. 

At 15:49 CEST, mission management obtained the long-awaited acquisition of sign, prompting cheers and applause. 

“We’re thrilled, but additionally relieved. Separating two spacecraft from 200 million kilometres away will not be one thing we do on daily basis. We’ve ready intensively for this second, so we’re actually happy to have had an ideal separation,” says a beaming Ignacio “Nacho” Clerigo, ESA BepiColombo Spacecraft Operations Supervisor. 

Farewell MTM

Each nice collaboration deserves a correct goodbye. 

On its ultimate day as a part of BepiColombo, MTM captured its final photos, persevering with a task it had fulfilled all through the mission’s journey to Mercury. 

Alongside its photo voltaic arrays and ion thrusters, MTM carried three monitoring cameras that documented the voyage. Through the cruise part, they captured each day snapshots of the spacecraft’s journey by means of the inside Photo voltaic System. 

The ultimate photos marked the closing entry in an eight-year picture diary and the tip of a exceptional collaboration that carried the mission to Mercury’s doorstep. 

A full assortment of those photos is obtainable within the ESA Planetary Science Archive. 

As for MTM, with no antenna or onboard laptop of its personal, the now inoperable module will stay in a steady orbit across the Solar. 

“We really feel a bit unhappy to see our previous pal MTM going away. It did an astonishing job bringing MPO and Mio right here, however as Freddie Mercury as soon as sang, the present should go on!” says Nacho. 

To mark the achievement, the MCT took half in one in all ESOC’s most enduring traditions: the sticker ceremony. On the day after separation, the group gathered so as to add the MTM sticker on the Briefing Room glass door, securing its place among the many missions which have formed ESOC’s historical past.  

“I really feel so pleased with this group. That is the proper begin to arrival part,” says a smiling Santa Martínez Sanmartín, ESA BepiColombo Mission Supervisor. 

Carrying the mission

Roughly the dimensions of a small automobile, the Mercury Switch Module carried two 15-metre-long photo voltaic wings that powered your entire spacecraft stack and propelled it utilizing its extremely superior photo voltaic electrical propulsion (SEP) system. 

This know-how makes use of photo voltaic power to show xenon gasoline into plasma that’s expelled by means of 4 ion thrusters. In contrast to chemical propulsion, which supplies quick, highly effective bursts of acceleration, SEP delivers mild however steady thrust for days, weeks and even months whereas utilizing far much less propellant. 

This effectivity is what made BepiColombo’s complicated journey to Mercury doable. Alongside the way in which, the mission overcame vital challenges. BepiColombo’s path to Mercury wanted a mid-course rethink after a difficulty decreased the ability obtainable from MTM’s photo voltaic arrays. Mission groups tailored the trajectory, permitting the spacecraft to stay on observe for arrival. 

On 15 June 2026, SEP was switched off, bringing MTM’s main mission to an finish and organising the following main milestone which we noticed on 3 September – MTM separation. 

What’s subsequent for BepiColombo?

Following MTM separation, BepiColombo continues to be greater than three million kilometres from Mercury. 

In contrast to most interplanetary missions, arrival will not be a single occasion however a six-month sequence of fastidiously choreographed manoeuvres.

“The following separation shall be Mio. After seeing the profitable separation of MTM I really feel assured about what lies forward”, says JAXA’s BepiColombo Challenge Scientist, Go Murakami. 

With MTM’s job full, the remaining spacecraft stack now enters a brand new part of the journey. Utilizing MPO’s chemical propulsion system, the MCT will fine-tune the trajectory forward of Mercury orbit insertion on 21 November. Mio will then be deployed in early December, earlier than MPO is guided into its ultimate science orbit in March 2027. 

“Though we have already got nice science from the cruise part and 9 planet flybys, it is incredible that we have taken this primary vital step in direction of lastly having the ability to use all of the highly effective devices on each MPO and Mio to review Mercury,” says ESA BepiColombo Lead Challenge Scientist, Geraint Jones. 

By April 2027, the 2 spacecraft will start their scientific investigations, providing unprecedented insights into Mercury’s floor, inside, magnetic area and surrounding surroundings. 

Keep tuned for extra BepiColombo updates as we get nearer to Mercury!