Hayabusa2 touches down on asteroid, shoots it

Enlarge / The timeline of the approach and sampling process. (credit: JAXA)
Today, in an extended Twitter thread and ensuing press conference, JAXA's Hayabusa2 team announced that everything had gone well in gathering an asteroid sample for eventual return to Earth. While we don't yet know about the material it obtained, the Japanese spacecraft has successfully executed all the commands associated with the sample recovery.
Hayabusa2 has been in space since 2014, and it slowly made its way to an orbit 20km above the surface of the asteroid Ryugu. In late 2018, the spacecraft made a close approach to the asteroid and released two small, solar-powered robots that have been hopping on the surface since. This week has seen the first of what are intended to be several sample-gathering attempts.

The procedure for this is pretty straightforward: Hayabusa2 snuggles up to the asteroid and shoots it. The probe has a sample-gathering 'horn' that it can place up against the asteroid's surface. Once it's in place, Hayabusa2 can fire a bullet into the asteroid's surface, blasting material loose that will be gathered by the horn and stored for return to Earth. JAXA, the Japanese space agency, calls its gun a 'projector' but admits that the thing it fires is a bullet. JAXA has a webpage that describes some on-Earth testing of the whole system.
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