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Hayabusa 2: Japan probe to send lander to asteroid Hayabusa 2: German-led lander drops to asteroid's surface
(about 11 hours later)
Japan's space agency (Jaxa) is about to send a 10kg lander to the surface of an asteroid. Japan's space agency (Jaxa) has put another lander on the surface of asteroid 162173, or Ryugu.
The Hayabusa-2 spacecraft will release the German-French Mascot lander onto the asteroid 162173 Ryugu on Wednesday. The Hayabusa-2 probe ejected the German-French Mascot "rover" on Wednesday for its 20-minute journey down to the space rock.
Mascot will then analyse the asteroid's surface properties, including its mineral composition and magnetic field. Contact was confirmed shortly after 03:58 CEST (01:58 GMT; 02:58 BST).
Hayabusa-2 reached the asteroid Ryugu in June this year after a three-and-a-half-year journey. Mascot is designed to move across the surface of Ryugu and analyse its surface properties, including its mineral composition and magnetic field.
On 21 September, Jaxa celebrated a first, as its "mothership" deployed two robot explorers to the surface of Ryugu. Hayabusa-2 reached the asteroid in June this year after a three-and-a-half-year journey.
Now, it's the turn of the Mobile Asteroid Surface Scout (Mascot), which has been built by the German Aerospace Center (DLR) and the French Space Agency (Cnes). On 21 September, Jaxa celebrated a first, as the probe successfully put two small (18 cm wide) robot explorers on the surface.
Hayabusa-2 spent Tuesday reducing its altitude from its "home position" of 20km above the asteroid. At about 02:00 BST, and at an altitude of about 56m from Ryugu's surface, Mascot will be commanded to separate from its Japanese "mothership". Now, the Mobile Asteroid Surface Scout (Mascot), which has been built by the German Aerospace Center (DLR) and the French Space Agency (Cnes), has repeated the feat.
Mascot will then touch down at its pre-selected landing site. Mission planners expect it to bounce before coming to a stop. DLR said there was huge relief in the Mascot Control Centre had proceeded according to plan.
"It could not have gone better," explained project manager Tra-Mi Ho from the DLR Institute of Space Systems.
"From the lander's telemetry, we were able to see that it separated from the mothercraft, and made contact with the asteroid surface approximately 20 minutes later."
Hayabusa-2 had spent Tuesday reducing its altitude from its "home position" some 20km above the asteroid. When it got to an altitude of 51m from Ryugu's surface, the probe let the Mascot go to drift further down under the gentle pull of the 900-wide asteroid.
"The gravity is so low that Mascot more or less flies down, similarly to a piece of paper falling on to a table from a height of 30cm," explained Mascot's principal investigator, Dr Ralf Jaumann, just before the release.
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"Of course, we have a very low gravitational field there," said Dr Ralf Jaumann, the principal investigator for Mascot. The 9.6kg (21lbs) science package has now begun its investigation of the asteroid surface. Mascot will study Ryugu's mineral make-up, temperature and magnetic characteristics.
"This means the gravity is so low that Mascot more or less flies down, similarly to a piece of paper falling onto a table from a height of 30cm." The lander's payload consists of four science instruments: an infrared microscope called MicrOmega, a camera called MASCAM, a radiometer for measuring the power of electromagnetic radiation (MARA), and a magnetometer to measure magnetic forces (MASMAG).
The 9.6kg (21lbs) science package will then begin its investigation of the asteroid surface. Mascot will study Ryugu's mineral make-up, temperature and magnetic characteristics.
The lander's payload consists of four science instruments, an infrared microscope called MicrOmega, a camera called MASCAM, a radiometer for measuring the power of electromagnetic radiation (MARA) and a magnetometer to measure magnetic forces (MASMAG).
"The goal is to really understand the asteroid," said Christian Krause, the operations manager for Mascot."The goal is to really understand the asteroid," said Christian Krause, the operations manager for Mascot.
"Understanding how everything here formed - our Earth and the other planets. This is what we are trying to investigate.""Understanding how everything here formed - our Earth and the other planets. This is what we are trying to investigate."
Ralf Jaumann added: "The question of where the water on Earth originates hasn't really been answered yet." Dr Jaumann added: "The question of where the water on Earth originates hasn't really been answered yet."
We know that asteroids contain water today. Some scientists think that both asteroids and comets could have delivered water to Earth in the early days of the Solar System, when they collided with our planet.We know that asteroids contain water today. Some scientists think that both asteroids and comets could have delivered water to Earth in the early days of the Solar System, when they collided with our planet.
Hayabusa-2 was launched from the Tanegashima Launch Center in far southern Japan on 3 December 2014. It has been carrying a number of instrument payloads for release on to the surface of its target, Ryugu.Hayabusa-2 was launched from the Tanegashima Launch Center in far southern Japan on 3 December 2014. It has been carrying a number of instrument payloads for release on to the surface of its target, Ryugu.
On 21 September, it released two robot rovers onto Ryugu, which quickly returned images and the first video ever sent from the surface of an asteroid. On 21 September, it released two robot rovers on to Ryugu, which quickly returned images and the first video ever sent from the surface of an asteroid.
In late October, the spacecraft will descend to the surface to collect a sample of rock and soil.In late October, the spacecraft will descend to the surface to collect a sample of rock and soil.
Even further on in the mission, Jaxa plans to detonate an explosive charge that will punch a crater in Ryugu. Even further into the mission, Jaxa plans to detonate an explosive charge that will punch a crater in Ryugu.
Hayabusa-2 would then descend into the crater to collect fresh rocks that have not been altered by aeons of exposure to the environment of space. Hayabusa-2 would then descend into this crater to collect fresh rocks that have not been altered by aeons of exposure to the environment of space.
These samples will then be sent to Earth for laboratory studies. The plan is to bring these samples back to Earth for laboratory study.
Follow Paul on Twitter.Follow Paul on Twitter.