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High three photographs from BepiColombo’s sixth Mercury flyby

January 10, 2025
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High three photographs from BepiColombo’s sixth Mercury flyby
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On 8 January 2025, the ESA/JAXA BepiColombo mission flew previous Mercury for the sixth time, efficiently finishing the ultimate ‘gravity help manoeuvre’ wanted to steer it into orbit across the planet in late 2026. The spacecraft flew just some hundred kilometres above the planet’s north pole. Shut-up photographs expose probably icy craters whose flooring are in everlasting shadow, and the huge sunlit northern plains.

At 06:59 CET, BepiColombo flew simply 295 km above Mercury’s floor on the planet’s chilly, darkish evening aspect. Round seven minutes later, it handed instantly over the Mercury’s north pole earlier than getting clear views of the planet’s sunlit north.

European Area Company (ESA) Director Common Josef Aschbacher revealed the primary picture throughout his Annual Press Briefing on 9 January. As throughout BepiColombo’s earlier flybys, the spacecraft’s monitoring cameras (M-CAMs) didn’t disappoint.

This flyby additionally marks the final time that the mission’s M-CAMs get up-close views of Mercury, because the spacecraft module they’re hooked up to will separate from the mission’s two orbiters – ESA’s Mercury Planetary Orbiter and JAXA’s Mercury Magnetospheric Orbiter – earlier than they enter orbit round Mercury in late 2026.

Celebrating the M-CAMs’ last hurrah, let’s discover the very best three photographs from BepiColombo’s sixth shut encounter with the little planet, and what they reveal about mysterious Mercury.


Mercury’s shadowy north pole revealed by M-CAM 1

Peering into Mercury’s darkest craters

After flying by means of Mercury’s shadow, BepiColombo’s monitoring digicam 1 (M-CAM 1) bought the primary shut views of Mercury’s floor. Flying over the ‘terminator’ – the boundary between day and evening – the spacecraft bought a singular alternative to see instantly down into the forever-shadowed craters at planet’s north pole.

The edges of craters Prokofiev, Kandinsky, Tolkien and Gordimer solid everlasting shadows on their flooring. This makes these unlit craters a few of the coldest locations within the Photo voltaic System, regardless of Mercury being the closest planet to the Solar!

Excitingly, there may be present proof that these darkish craters include frozen water. Whether or not there may be actually water on Mercury is likely one of the key Mercury mysteries that BepiColombo will investigate once it is in orbit around the planet.

A surface shaped by impacts and lava

To the left of Mercury’s north pole in M-CAM 1’s view lie the vast volcanic plains known as Borealis Planitia. These are Mercury’s largest expanse of ‘smooth plains’ and were formed by the widespread eruption of runny lava 3.7 billion years ago.

This lava flooded existing craters, such as the Henri and Lismer craters highlighted in the image. The wrinkles in the surface were formed over billions of years following the solidification of the lava, probably in response to the planet contracting as its interior cooled down.


Mercury’s sunlit north viewed by M-CAM 1

Another M-CAM 1 image, taken just five minutes after the first, shows that these plains extend over a large part of Mercury’s surface. Prominently visible is the Mendelssohn crater, whose outer rim is barely visible above its flooded interior. Just a handful of smaller, more recent impact craters dent the smooth surface.

Further out, but still within the Borealis Planitia, the Rustaveli crater suffered a similar fate.

On the bottom left of the image lies the massive Caloris basin, Mercury’s largest impact crater, which spans more than 1500 km. The impact that created this basin scarred Mercury’s surface up to thousands of kilometres away, as evidenced by the linear troughs radiating out from it.

Above a particularly large trough, a boomerang-shaped curve brightens the surface. This bright lava flow appears to connect to a deep trough below it. It appears similar in colour to both the lava on the floor of the Caloris basin and the lava of Borealis Planitia further north. Yet another mystery that BepiColombo hopes to solve is which way this lava moved: into the Caloris basin, or out of it?


Lava and debris brighten Mercury’s surface

On Mercury, a bright surface is a young surface

While M-CAM’s images might not always make it appear so, Mercury is a remarkably dark planet. At a first glance the cratered planet may resemble the Moon, but its cratered surface only reflects about two-thirds as much light.

On this dark planet, younger features on the surface tend to appear brighter. Scientists don’t yet know what exactly Mercury is made of, but it is clear that material brought up from beneath the outer surface gradually becomes darker with age.

BepiColombo’s third image selected from this flyby, taken by M-CAM 2, shows spectacular examples of the two things that bring bright material to the surface: volcanic activity and large impacts.

The bright patch near the planet’s upper edge in this image is the Nathair Facula, the aftermath of the largest volcanic explosion on Mercury. At its centre is a volcanic vent of around 40 km across that has been the site of at least three major eruptions. The explosive volcanic deposit is at least 300 km in diameter.

And to the left lies the relatively young Fonteyn crater, which formed a ‘mere’ 300 million years ago. Its youth is apparent from the brightness of the impact debris that radiates out from it.

Throughout its mission, several BepiColombo instruments will measure the composition of both old and new parts of the planet’s surface. This will teach us about what Mercury is made of, and how the planet formed.

Finishing in style

“This is the first time that we performed two flyby campaigns back-to-back. This flyby happens a bit more than a month after the previous one,” says Frank Budnik, BepiColombo Flight Dynamics Manager. “Based on our preliminary assessment, everything proceeded smoothly and flawlessly.”

“BepiColombo’s main mission phase may only start two years from now, but all six of its flybys of Mercury have given us invaluable new information about the little-explored planet. In the next few weeks, the BepiColombo team will work hard to unravel as many of Mercury’s mysteries with the data from this flyby as we can,” concludes Geraint Jones, BepiColombo’s Project Scientist at ESA.

BepiColombo’s sixth Mercury flyby

About BepiColombo

Launched on 20 October 2018, BepiColombo is a joint mission between the European Space Agency (ESA) and the Japan Aerospace Exploration Agency (JAXA), executed under ESA leadership. It is Europe’s first mission to Mercury.  

The mission comprises two scientific orbiters: ESA’s Mercury Planetary Orbiter (MPO) and JAXA’s Mercury Magnetospheric Orbiter (Mio). The European Mercury Transfer Module (MTM) carries the orbiters to Mercury.   

After arrival at Mercury in late 2026, the spacecraft will separate and the two orbiters will manoeuvre to their dedicated polar orbits around the planet. Starting science operations in early 2027, both orbiters will gather data during a one-year nominal mission, with a possible one-year extension.  

All M-CAM images will be made publicly available in the Planetary Science Archive. 

For extra info, please contact:

ESA media relations 
media@esa.int 

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