September 28, 2018
This image of the Asteroid Ryugu was captured by Japan's Hayabusa2 mothership from an altitude of about 210 feet (64 meters) on Sept. 21, 2018, just before the craft deployed two tiny, hopping rovers toward the space rock. This is the highest-resolution photograph obtained of Ryugu's surface to date.
Credit: JAXA, University of Tokyo, Kochi University, Rikkyo University, Nagoya University, Chiba Institute of Technology, Meiji University, Aizu University, AIST
Wow! Asteroid Ryugus Rubbly Surface Pops in Best-Ever Photo
The sharpest-ever photo of the big asteroid Ryugu shows a complex surface strewn with rocks and rubble.
Japan's Hayabusa2 spacecraft captured the image with its Optical Navigation Camera-Telescopic instrument at 12:04 a.m. EDT (0404 GMT) on Sept. 21, 2018, from a height of about 210 feet (64 meters), according to Japan Aerospace Exploration Agency (JAXA) officials.
It's the highest-resolution photo snapped to date of Ryugu's 3,000-foot-wide (900 m) surface, JAXA officials added.
Just 2 minutes after the image was taken, Hayabusa2 deployed two tiny, hopping rovers called MINERVA-II1A and MINERVA-II1B toward Ryugu. The little robots stuck their landings in a historic first and are currently exploring the space rock, gathering a variety of data. (Several other spacecraft have touched down softly on an asteroid, but none have been rovers deployed from a mothership like Hayabusa2.)
Another landing will come next week, if all goes according to plan. On Oct. 3, Hayabusa2 is scheduled to deploy a shoebox-size lander named MASCOT, which was built by the German space agency, DLR, in collaboration with the French space agency, CNES.
Like MINERVA-II1A and MINERVA-II1B, MASCOT will move by hopping rather than rolling, which is a good thing, given the roughness of Ryugu's surface, and the asteroid's low gravity, which makes traditional roving a nonstarter. Wheeled vehicles would float away from the rock as soon as they started rolling, Hayabusa2 team members have said.
Wow! Asteroid Ryugus Rubbly Surface Pops in Best-Ever Photo
The $150 million Hayabusa2 mission launched in December 2014 and arrived in orbit around Ryugu in late June of this year. The orbiter also carries another bantam hopper known as MINERVA-II2, an "optional" rover that might be deployed sometime next year. And the mothership will drop down to the surface itself in 2019, snagging samples that will come to Earth in a return capsule in December 2020.
The various data gathered at Ryugu, and analyses of the returned sample, should help researchers better understand the early solar system and the role that carbon-rich rocks like Ryugu may have played in helping life get started on Earth, mission officials have said.
NASA has its own asteroid-sampling mission underway, with many of the same goals. The OSIRIS-REx spacecraft is scheduled to arrive in orbit around the near-Earth asteroid Bennu on Dec. 31 and return samples of the rock to Earth in September of 2023.
And about all those acronyms: MINERVA stands for "Micro Nano Experimental Robot Vehicle for Asteroid"; MASCOT for "Mobile Asteroid Surface Scout"; and OSIRIS-REx for "Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer."
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