05/05/2020
Joint mission will send two unmanned probes into orbit around the closest planet to the sun
The BepiColombo standing in position at a test facility in Spijkenisse. Its mission to Mercury is scheduled for launch on an Ariane 5 from Europe’s Spaceport in Kourou, French Guiana on October 20. Photo: AFP Photo
Final preparations were underway on Friday for the launch of a joint mission by European and Japanese space agencies to send twin probes to Mercury, the closest planet to the sun.
An Ariane 5 rocket is scheduled to lift the unmanned spacecraft into orbit from French Guiana shortly before midnight, the start of a seven-year journey to the solar system’s innermost planet.
Mercury is seen in silhouette, lower third of image, as it transits across the face of the sun. Photo: AFP PHOTO / NASA / BILL INGALLS
The European Space Agency says the €1.3 billion (US$1.5 billion) mission is one of the most challenging in its history. Mercury’s extreme temperatures, the intense gravity pull of the sun and blistering solar radiation make for hellish conditions.
An Ariane-5 rocket is set for launch at the Guiana Space Centre in Kourou in French Guiana. Photo: Kyodo
Newly developed electrical ion thrusters will help nudge the spacecraft, which was named after Italian scientist Giuseppe “Bepi” Colombo, into the right orbit.
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When it arrives, BepiColombo will release two probes – Bepi and Mio – that will independently investigate the surface and magnetic field of Mercury. The probes are designed to cope with temperatures varying from 430 degrees Celsius (806F) on the side facing the sun, and -180 degrees Celsius (-292F) in Mercury’s shadow.
An Ariane-5 rocket is transported to its launch site at the Guiana Space Centre in Kourou. Photo: Kyodo
Scientists hope to build on the insights gained by Nasa’s Messenger probe, which ended its mission in 2015 after a four-year orbit of Mercury. The only other spacecraft to visit Mercury was Nasa’s Mariner 10 that flew past the planet in the mid-1970s.
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Mercury, which is only slightly larger than Earth’s moon, has a massive iron core about which little is known. Researchers are also hoping to learn more about the formation of the solar system from the data gathered by the BepiColombo mission.
Source: SCMP
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