science

BepiColombo: British spacecraft to blast off to Mercury and attempt to solve solar system’s mysteries



A British-built spacecraft is about to blast off to Mercury.

The BepiColombo ship will fly five billion miles to the planet that is closest to our sun.

The scientists behind it hope that it can help solve some of the mysteries that hang over the distant world. It might, for instance, contain water ice, hidden in shadows on its otherwise blazing hot surface, scientists speculate – a discovery that could help shed light on the possibility of alien life in our own solar system.

It will also look to explain why the planet has such as huge iron core at its centre, and unlock the history of the vast volcanic vents that shook its surface for billions of years.

BepiColombo is due to blast off from the European spaceport at Kourou, French Guiana, at 2.45am UK time on Saturday October 20.

The four-tonne craft will be carried into space by a heavy lift Ariane 5, the European Space Agency’s most powerful rocket.

It will then immediately begin a complex journey that will take seven years.

At its destination, BepiColumbo will deploy two orbiters, one European and the other Japanese, to circle the planet for up to two years.

The spacecraft is fitted with futurist ion plasma engines, designed and built in the UK, which emit beams of electrically charged xenon gas.

The spacecraft BepiColombo is seen at the European Space Agency’s (ESA) European Space Research and Technology Centre (ESTEC) in Noordwijk, Netherlands (REUTERS/Michael Kooren)

It is the first time the technology has been used on a major interplanetary mission. Smaller craft have previously employed ion thrusters to reach asteroids and the moon.

The ion drive will be used not to accelerate the spacecraft but to act as a brake as it falls into the grip of the sun’s powerful gravity.

A complex series of fly-bys past the Earth, Venus and Mercury will further reduce its velocity.

Even so, BepiColumbo will reach a top speed of 60 kilometres (37 miles) per second.

The European Space Agency’s Mercury Planet Orbiter (MPO), which will survey the planet’s surface and probe its chemistry, was built by satellite company Airbus Defence and Space in Stevenage.

Airbus also constructed the power unit carrying the orbiters, the Mercury Transfer Module (MTM), in the UK. The ion thrusters were supplied by British defence technology company QinetiQ.

One of the European orbiter’s 11 instruments, the Mercury Imaging X-ray Spectrometer (Mixs) was designed and built at the University of Leicester.

The Japanese space agency Jaxa’s Mercury Magnetosphere Orbiter (MMO) will study the planet’s internal structure and enveloping magnetic field.

A major challenge for mission planners was ensuring the spacecraft could withstand searing temperatures of more than 350C so close to the sun.

Protective measures include a heat shield, novel ceramic and titanium insulation, ammonia-filled “heat pipes”, and in the case of the Japanese orbiter, spinning.

Dr Graham Turnock, chief executive of the UK Space Agency, said: “UK scientists, engineers and technicians have played a vital role in developing BepiColombo and the incredibly sophisticated set of scientific instruments on board.

“The international collaboration involved in this mission shows how our leading role in the European Space Agency is ensuring the UK thrives in the new space age, bringing real benefits to UK companies and scientists.”

Only two spacecraft have previously visited Mercury. Nasa’s Mariner 10 flew past the planet three times in 1974-75 and the American space agency’s Messenger probe orbited Mercury from 2011 to 2015, taking photos of the surface.

Dr Jerry Bolter, project manager at Airbus Defence and Space in Stevenage, said: “The scientists describe Messenger as the hors d’oeuvre and Bepi as

the main course.”

The spacecraft was named after the late Guiseppe “Bepi” Colombo, an Italian scientist and engineer who played a leading role in the 1974 Mariner 10 mission to Mercury.

Paolo Ferri, head of missions at the European Space Operations Centre (ESOC) in Darmstadt, Germany, said: “Mercury is a planet of extremes, and getting there requires some equally extreme techniques, navigation solutions and operations expertise.”

Additional reporting by Press Association



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