Initially, launch was planned for 30 November 2014 (13:23 local time), but was delayed to 3 December 2014 04:22 UTC (4 December 2014 13:22:04 local time).
The target is asteroid (162173) 1999 JU3. Hayabusa 2 is expected to arrive at the target in July 2018, survey the asteroid for a year and a half, depart in December 2019, and return to Earth in December 2020.
Hayabusa 2 was agreed by the Space Activities Commission, a board governing funding for the Japanese space program, during 2006 and was announced in a new year interview with JAXA president Keji Tachikawa.
In July 2009, at the 27th ISTS (International Symposium on Space Technology and Science) conference in Japan, presentations were given that elaborated upon the most recent Hayabusa 2 mission concept. Makoto Yoshikawa of JAXA presented a paper entitled "Hayabusa Follow-on Asteroid Sample Return Missions." Dr. Yoshikawa stated that JAXA has a new proposal for Hayabusa 2, namely that the mission have two spacecraft with one specifically being an impactor.
In August 2010, JAXA got the go-ahead from the Japanese government to begin development of Hayabusa 2. The estimated cost of the project is 16.4 billion yen.
NEC Corp. of Tokyo announced in January 2012 that it was beginning system design of the 590 kg (1,300-pound) spacecraft, its Ka-band communications system and an intermediate infrared camera. NEC was the builder of the Hayabusa probe.
The German Aerospace Center built a small lander called MASCOT (Mobile Asteroid Surface Scout) for the mission in a cooperation with the French space agency CNES. The MASCOT carries an infrared spectrometer, a magnetometer, a radiometer and a camera, and is capable of lifting off of the asteroid to reposition itself for further measurements.
The Small Carry-on Impactor (SCI) is a small drop-off explosively formed penetrator, consisting of a 2.5 kilogram (5.5 lb) copper projectile and a 4.5 kilogram (10 lb) shaped charge. It will be dropped off Hayabusa 2; the low gravity leaves the spacecraft enough time to maneuver to the opposite side of the asteroid. A second instrument will then be deployed, the deployable camera (DCAM3). This camera will observe the explosion of the Small Carry-on Impactor instrument. The explosion will form a copper penetrator hitting the asteroid with a velocity of 2 km/s. The crater created by the impact will be the site of further observations by the onboard instruments. The shaped charge will consist of 4.5 kg of plasticized HMX and a 2.5 kg copper liner.
Payloads are separated by bullets ( · ), launches by pipes ( | ). Manned flights are indicated in bold text. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).