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takyon writes:

JAXA's Hayabusa2 spacecraft has begun orbiting asteroid 162173 Ryugu at a distance of about 20 kilometers:

JAXA confirmed Hayabusa2, JAXA's asteroid explorer rendezvoused with Ryugu, the target asteroid.

On June 27, 2018, JAXA operated Hayabusa2 chemical propulsion thrusters for the spacecraft's orbit control.*

The confirmation of the Hayabusa2 rendezvous made at 9:35 a.m. (Japan Standard Time, JST) is based on the following data analyses;

·The thruster operation of Hayabusa2 occurred nominally
·The distance between Hayabusa2 and Ryugu is approximately 20 kilometers
·Hayabusa2 is able to maintain a constant distance to asteroid Ryugu
·The status of Hayabusa2 is normal

Also at Spaceflight Now.

Previously: Hayabusa2 Approaches Asteroid Ryugu

Original Submission

takyon writes:

Japan's asteroid mission faces 'breathtaking' touchdown

The ultimate objective [of the Hayabusa2 spacecraft near asteroid Ryugu], to bring asteroid samples back to Earth, will allow lab studies that can reveal much more about the asteroid's age and content. ISAS engineers programmed the craft to perform autonomous landings, anticipating safe touchdown zones at least 100 meters in diameter. Instead, the biggest safe area within the first landing zone turned out to be just 12 meters wide.

That will complicate what was already a nail-biting operation. Prior to each landing, Hayabusa2 planned to drop a small sphere sheathed in a highly reflective material to be used as a target, to ensure the craft is moving in sync with the asteroid's rotation. Gravity then pulls the craft down gently until a collection horn extending from its underside makes contact with the asteroid; after a bulletlike projectile is fired into the surface, soil and rock fragments hopefully ricochet into a catcher within the horn. For safety, the craft has to steer clear of rocks larger than 70 centimeters.

During a rehearsal in late October, Hayabusa2 released a target marker above the 12-meter safe circle; unfortunately, it came to rest more than 10 meters outside the zone. But it is just 2.9 meters away from the edge of a second possible landing site that's 6 meters in diameter. Engineers now plan to have the craft first hover above the target marker and then move laterally to be above the center of one of the two sites. Because the navigation camera points straight down, the target marker will be outside the camera's field of view as Hayabusa2 descends, leaving the craft to navigate on its own.

takyon writes:

Asteroid capsule 'found' in Australian desert

A recovery team in Australia has found a space capsule carrying the first large quantities of rock from an asteroid.

The capsule, containing material from a space rock called Ryugu, parachuted down near Woomera in South Australia.

The samples were originally collected by a Japanese spacecraft called Hayabusa-2, which spent more than a year investigating the object.

The container detached from Hayabusa-2, later entering the Earth's atmosphere.

The official Hayabusa-2 Twitter account reported that the capsule and its parachute had been found at 19:47 GMT.

Also at CNET.

Previously: Hayabusa2 Approaches Asteroid Ryugu
Hayabusa2 Reaches Asteroid 162173 Ryugu
Hayabusa2 Deploys MINERVA Landers to Asteroid Ryugu
Japan's Hopping Rovers Capture Amazing Views of Asteroid Ryugu
Short-Lived MASCOT Lander Reaches Asteroid Ryugu
Hayabusa2 Spacecraft Faces Difficulties in Landing and Collecting a Sample from an Asteroid
Hayabusa2 "Lands" on Asteroid Ryugu

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