Hayabusa 2 a rewarding experience, sampling the first human landing on the asteroid several times!

　　December 3, 2019, Hayabusa 2 officially started ion engine, horsepower full return Earth, forever ended its "underwater" adventure.
　　In just a year and a half before, Fengyun detector lasted just three and a half times trek billions of kilometers, arrived Fengyun called "underwater" in diameter asteroid is only about 900 meters.　　
　　<strong> Part.1 </ strong>
<strong> Time flies really fast! </ strong>
　　in the second half of 2018, Hayabusa 2 has completed a number of outstanding scientific investigation, successfully dropped two visits and a lander.　　
　　 <strong> This is the first time the successful release Patroller on asteroids and shoot and return photos. </ strong>
　　but after 2019, is the true mettle detector Fengyun year, rewarding year.
　　2019, can justifiably claim to be a lucky year for Hayabusa No. 2. This implies that lucky, is also related to numerous workers in the years of careful planning and tireless efforts in return.
　　<strong> Part.2 </ strong>
　　<strong> First Landing sample: </ strong> <strong> acquisition surface material </ strong>
　　February 22, 2019, Hayabusa 2 smooth landing L08-E1 intended landing zone underwater surface. (See in this section:! A split face to face Hayabusa 2 Full Record first sampling underwater)
　　touchdown point is very accurate, and only deviates from a predetermined central landing zone of 1 meter.
　　Hayabusa 2 is used in contact with the sample, the entire sampling process only a few seconds.　　
　　Once in the end long sampling Minister lever contact surface to the underwater detection, it immediately from the sampling rod at a speed of 300 m / sec emits a tantalum bullet, fired underwater surface.
　　Bullet dislodged debris is ejected into the sampling rod, after several ejector is Hayabusa 2 into the pocket.
　　Landing, the contact sampling, rise, a split crisp.
　　Hayabusa 2 for the first time landing the sampling process (low height section).　　
　　<strong> Part.3 </ strong>　　
left after <strong> intense sampling of "evidence" </ strong>
　　After the successful completion of the first landing sampling, as well as greater ambitions Hayabusa 2.
　　Although the asteroid is ancient and primitive solar system material remains, but most of the surface of the asteroid material through a long space weathering and alteration, is likely to have does not reflect the composition of matter when it originally formed.
　　In other words, <strong> you want to know the raw material composition of the solar system, you need to peel the surface of the asteroid, collect material inside job. </ strong>
　　<strong> Part.4 </ strong>
<strong> cast impactor: </ strong> <strong> asteroid to blow a hole </ strong>
　　To this end, using Hayabusa 2 using more violent and adventurous way. (See this section: First, hit a shot at me, and then have to fire ... human beings are too cruel it!)
　　April 5, 2019, Hayabusa 2 dropped a "bomb" to underwater surfaces - Heavy up to 14 kg striker (Small Carry-on impactor, referred to as the SCI) (9.5 kg which is explosive).
　　The striker was dropped detonated in the air, the bottom thickness of 5 mm and a weight of 2 kg of pure copper sheet "compressed" as a "shell", so that a high speed hit the underwater surface.
　　<strong> Part.5 <
　　Hayabusa 2 blown out of the machine in order not to spatter hit, throw finished "bomb" started to run, leaving only a DCAM3 camera to take this blasting drama.
　　Strike was very successful, direct blow with a diameter of more than ten meters underwater artificial crater in the surface, Hayabusa 2 own safe haven, unscathed.
　　These knocked out of the surface of the underwater subsurface underground fresh material, we are waiting for Hayabusa 2 landing again, and in the bag.
　　<strong> Part.6 </ strong>
<strong> second landing sampling: </ strong> <strong> collection subsurface material </ strong>
　　2019 Nian 7 11, Hayabusa 2 fall again, arrived underwater surface C01-Cb region, start a second sampling landings.
　　The second landing area sampling area of three-dimensional terrain DEM　　
　　a time, Yin Ping first break, gravel sky, Hayabusa 2 asteroid underwater again a complete electro-optical flint "encounter", then rose rapidly.
　　At 9:03 on July 11, 2019: 54-9: 11:44 (on the machine, Beijing time), landing Hayabusa 2 CAM-H camera, sampling, the rising process (10X). The initial height of 8.5 meters, the final height of 150 m. Source: JAXA
　　although the first sample to the detector caused little damage, when Hayabusa 2 is not as healthy as the underwater just arrived. But under the careful planning of the project team and repetitive exercises, Hayabusa 2 is still successfully completed its second landing sampling, but also precise than the first landing.
　　The actual landing site and planned landing zone center only a thin 60 cm! (The first is the difference between 1 meter).　　
<em id = "__ mceDel" > </ em> violence marks left after the second close quarters.
　　July 12, Hayabusa 2 with a substance from the underwater surface to the next collection, safely back with flying underwater from the surface location 20 km height, the second sampling landing a success.
　　Two landing sampling points were named "hand me" (Tamatebako) and "Wanbao hammer" (Uchide-no-kozuchi) , are derived from Japanese legends.
　　<strong> This is the first human landing on the asteroid sampling completed successfully many times, and for the first time to collect subsurface samples underground. </ strong>
　　At this point, Hayabusa two No. 2 in two rounds, a successful income underwater asteroid surface material samples and subsurface underground. But before returning to Earth, it has one last little job to do, and that is: <strong> dropped last one Patroller MINERVA-II2. </ strong>
　　<strong> Part.7 </ strong>
<strong> dropped last one Patroller: </ strong> <strong> an amazing journey </ strong>
　　However, unfortunately, the last one Patroller from the beginning of November 2018 has detected a fault, only to maintain communication, but can not start processing the response data. That is, the patrol While initially planned landing underwater surface, mobile and camera work can not be done. (But it will not matter, last year's launch of two MINERVA-II1 has completed work perfectly)
　　but Hayabusa 2 team did not give up and finally let While the rest of the tour and also fired several balls marked active aging.
　　In the case has been unable to take pictures and observed, Hayabusa 2 team the ingenuity, let two balls labeled TM-E, TM-C and Patroller MINERVA-II2 from higher altitudes (about 1 km high at) is released to the underwater surface, <strong> observe their underwater motion at the weak gravity, while improving the underwater gravity field model. <
　　Under the faint gravitational underwater, three little guys have experienced an unprecedented amazing journey: It took a few days, a few laps around the asteroid underwater, it slowly fell underwater surface.　　
　　<strong> This is the smallest man-made global "satellite" human so far radially outer celestial served, is the world's first successful launch complex satellites to track small objects ring. </ strong> To this end, Hayabusa 2 team with two first human artificial satellite Nick Split 1 (Sputnik 1) Explorer and No. 1 (Explorer 1), two of the ball marker and TM-C TM-E named, named Split Nick and explorers.
　　<strong> Part.8 </ strong>
　　<strong> return: </ strong> <strong> forward earth, underwater goodbye! </ strong>
　　2019 Nian 11 13, Hayabusa 2 RCS thrusters to start from the starting position away from the asteroid with flying underwater, officially entered the "return mode."
　　Return the first five days, Hayabusa 2 will take a series of photos as a farewell underwater, then it will change the orientation, no longer see the underwater.
　　Finally, a recent photograph underwater, back rest, lopsided.
　　Finally say goodbye.
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<span style =" font-size: 13px; Color: # 888888; "> November 12, 2019, Hayabusa control room before the departure of the No. 2 official sources:. JAXA </ span>
　　<strong> If all goes well, Hayabusa 2 will reach Earth in December 2020, filled with precious asteroids the sample return capsule re-entry to Earth's atmosphere, burning, </ strong> landed in Australia Woomera-- this is 10 years ago, Phoenix, Hayabusa returns the local machine early fall cabin. <EM the above mentioned id = " mceDel" = style "text-align = left: Center;"> </ EM>
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　　waiting embracing aseptic chamber underwater sample ready .　　
　　2019 this year, too short too long goodbye, underwater work hard, Hayabusa 2 2020, we meet the Earth goodbye.!!
　　Publisher: science China
　　production: haibaraemily
　　Producer: computer network information Center, Chinese Academy of Sciences