Asteroid Explorer, Hayabusa2
press briefing

June 29, 2022
JAXA Hayabusa2 ProjectToday’s topics
Changes to the structure of the Hayabusa2 Project, and the distribution of thesample from asteroid Ryugu.
1. Hayabusa2 Project results・Engineering Achievements
・Science Achievements
・Public relations, outreach, awards, and others
2. Hayabusa2 Extended Mission
・Overview, schedule
・Nickname, outreach
3. Ryugu sample distribution
4. Future plans
2022/6/29

Hayabusa2 press briefing21. Results from the Hayabusa2 Project• The Hayabusa2 Project met all the criteria for success at the JAXA
review, which cited engineering achievements that included nineworld firsts, and scientific results that were published in numerous
papers, including major journals.
• The Project has opened up new possibilities for the future, including
the Extended Mission.

2022/6/29

Hayabusa2 press briefing

3

Hayabusa2 Mission Success Criteria andAchievements

Success criteria initiallyset by the Hayabusa2
Project ▶

Minimum success：Minimum goal reached
Full success：All planned goals reached
Extra success：
Challenges if situation permits

Mission goal

Minimum success【Science goal１】

Investigate the material sciencecharacteristics of C-type asteroids. In
particular, clarify the interaction between
minerals, water and organic matter.

【Science goal２】
Investigate the formation process ofasteroids by direct exploration of theasteroid’s reaccumulation process,internal structure and subsurface
material.

Achievement ④
Provide new insights on the surface
material of C-type asteroids byobservations in the vicinity of theasteroid.
Confirm：Initial results paper for
Ryugu vicinity operations (2019/4)
Achievement ⑤
Provide insights on the internal
structure of the asteroid byobservations in the vicinity of theasteroid.
Confirm：Initial results paper for
Ryugu vicinity operations (2019/4)

Full success

Extra successAchievement ⑩
Obtain new findings on mineral-waterorganic interactions from the initial analysisof the collected samples.

Achievement ⑪ （in progress）
Integrate astronomical & microscale
information to create new scientific results
regarding materials for Earth, sea and life.

Confirm：Phase1 curation initial results
paper (2021/12)

Confirm：Phase2 curation / sample initial
analysis paper (2022/6~)

Achievement ⑦
Obtain new knowledge on the internal
structure and subsurface material of theasteroid by observing the phenomena
caused by collisions with an impacting
body.

Achievement ⑧
・Present scientific results on asteroid
formation based on new findings
regarding the collision destruction &reaccumulation process.
・New scientific results from the
exploration robots on the surface
environment of asteroids.

Confirm：Paper on the outcome of theartificial crater experiment (2020/3)

Confirm：results papers (2019/4, 2020/3)

The Hayabusa2 Project has
achieved all set goals.
（According to the JAXA
internal assessment)※①～⑪ indicate order achieved（credit：JAXA）

2022/6/29

Achievement ①
Rendezvous with a target orbit using
ion engines for deep space propulsion.

【Engineering goal１】
Improve robustness, accuracy andoperability of the new technology
implemented in Hayabusa, andmature it as a technology.

Confirm：Ryugu arrival (2018/6)

Achievement ⑨
・Drop the exploration robot to the asteroid
surface.
・Take a sample of the asteroid surface.
・Collect the re-entry capsule on Earth.

N/A

Confirm：Successful completion of
MINERVA-II (2018/9), 1st touchdown(2019/2), Earth return (2020/12)【Engineering goal２】
Demonstrate impact object colliding
with a celestial body.

Achievement ②
Construct a system to allow an impact
device to collide with the target object
and perform that collision with theasteroid.
Confirm：Artificial crater experiment(2019/4)

Hayabusa2 press briefing

Achievement ③
Make the impact device collide in a
specified area.
Confirm：Confirmation topography ofartificial crater (2019/4)

Achievement ⑥
Collect a sample of asteroid subsurface
material exposed during the collision.
Confirm：Completion of 2nd touchdown(2019/7)

4

Hayabusa2：Engineering achievements (9 world firsts)
1.Exploration of the surface of a small celestial body by a small exploratory robot
2. Drop and deploy multiple robots onto a small celestial bodyMoment of 1st touchdown, captured by CAM-H (credit: JAXA)MASCOT immediately after
separation from Hayabusa2, takenby the ONC-W2 camera(credit: JAXA, U. Tokyo, Kochi U,
Rikkyo U, Nagoya U, Chiba Inst.
Tech, Meiji U, U. Aizu, Sokendai)

2nd touchdown separation accuracy(credit: JAXA, U. Tokyo, Kochi U,
Rikkyo U, Nagoya U, Chiba Inst.
Tech, Meiji U, U. Aizu, Sokendai)
Surface of asteroid
Ryugu, taken by the
MINERVA-II1A rover(credit: JAXA)

Hayabusa2 captured by
MINERVA-II1A (credit JAXA)

2022/6/29

Surface of asteroid Ryugu captured by
MASCOT (credit: MASCOT / DLR / JAXA)

Touchdown accuracy：59.8 cm
TM

C01-Cb(Target landing area, diameter 3.5m)

3. Generation of an artificial crater on an asteroid, anddetailed observation of the process before and after
Hayabusa2 press briefing

5Hayabusa2：Engineering achievements (9 world firsts)
4.Achieve landing accuracy on a celestial body of 60cm
Moment of artificial crater
generation captured by DCAM3

5. Landing at 2 sites on the same celestial body
6. Access subsurface material on a celestial body beyond the geosphere
Ejected material from the generation of the artificial crater

SCI (Small Carry-on Impactor)
immediately after separation,
captured by ONC-T

30m(credit: JAXA, Kobe
University, Chiba Inst.
Tech., Kochi U, U.
Occupational andEnvironmental Health)20m(credit: JAXA, U.
Tokyo, Kochi U,
Rikkyo U, Nagoya U,
Chiba Inst. Tech,
Meiji U, U. Aizu,
Sokendai)

Artifical crater

Artificial crater(credit: JAXA, U. Tokyo, Kochi U, Rikkyo U, Nagoya U,
Chiba Inst. Tech, Meiji U, U. Aizu, Sokendai, Kobe U) (credit: JAXA,(credit: JAXA,
Chiba Inst. Tech, U.
Tokyo, Kochi U,
Rikkyo U, Nagoya
U, Meiji U, U. Aizu,
AIST)

18m

TD2 target point

Impact poit

(credit: JAXA, U. Tokyo,
Kochi U, Rikkyo U, Nagoya
U, Chiba Inst. Tech, Meiji U,
U. Aizu, Sokendai)©Arakawa et al.,2020

Artificial crater captured by the ONCW2, and the second touchdown site.

Tohoku U,
Yamagata U,
Osaka U,Tokyo Denki U,
Tokyo U of Sci.,
Kyushu Inst. Tech,
Chiba Inst. Tech,
AIST, Rikkyo U,
U. Tokyo, Kochi U,
Nagoya U, Meiji U,
U. of Aizu)

2nd touchdown site

Target Marker (TM)(credit: JAXA, Chiba Inst. Tech, U.
Tokyo, Kochi U, Rikkyo U, Nagoya U,
Meiji U, U. Aizu, AIST)

7. Realisation of the smallest and multiple artificial
satellites to orbit a small celestial body
Hayabusa2 press briefing

The artificial crater (left: real image, right: contour map)

2022/6/29

6Hayabusa2：Engineering achievements (9 world firsts)
8. Sample of gaseous material returned from outside the geosphere
After the sample capsule wasseparated, the main body ofthe Hayabusa2 spacecraft
escaped from the geosphereand transitioned onto theorbit for the Extended
Mission. The Earth imaged
by ONC-T while leaving
Earth.
Earth return capsule landing in the Woomera
Desert, Australia.

（credit: JAXA, AIST, U. Tokyo, Kochi U, Rikkyo U,
Nagoya U, Chiba Inst. Tech, Meiji U, U. of Aizu）

Sampling the gas at the temporary
analysis facility in Woomera (6hours after atmosphere re-entry).

Fireball of the sample capsule entering theatmosphere, taken from Coober Pedy, a town
north of the Woomera Desert in Australia.

9. Sample return of C-type asteroid material(credit: JAXA)
2022/6/29

Ryugu sample inthe sample catcher
chamber A(collected during
the 1st touchdown).

5mm

Hayabusa2 press briefing

5mm

Ryugu sample inthe sample catcher
chamber C(collected during
the 2st touchdown).

7

Hayabusa2 : Engineering achievements■The “9 world firsts” in engineering by Hayabusa2

1) Mobile exploration of the surface of a small celestial body using a small
exploration robot.
2) Dropping and deploying multiple exploration robots onto a smallcelestial body.
3) Generation of an artificial crater on an asteroid, and detailed
observation of the process before and after.
4) Achieve landing accuracy on a celestial body of 60cm.
5) Landing at 2 sites on the same celestial body.
6) Access subsurface material on a celestial body beyond the Earth’s
geosphere
7) Realisation of the smallest and multiple artificial satellites to orbit asmall celestial body.
8) Sample of gaseous material returned from outside the geosphere.
9) Sample return of C-type asteroid material.
Further more, the realisation of “interplanetary round-trip navigation,
including take-off and landing” was the second in human history, after
Hayabusa.

2022/6/29■ Inheritance and development of “4 major
demonstration items” from Hayabusa

1) Interplanetary navigation using ion engines as the main
propulsion engine.
Completed round-trip navigation with all engines in good health.
Inherited and developed the interplanetary navigation technology
based on lessons learned with Hayabusa.
2) Autonomously approach and land on a celestial body using opticalinformation
Overcame the “homework” left by Hayabusa in the arrival, descent andlanding on an asteroid. Established pinpoint landing technology on an
asteroid, which had not been available with Hayabusa.
3) Collect a sample from the surface of a celestial body inmicrogravity
Successfully collect samples from two sites, a gas sample, andsubsurface material. Fully accomplished after setting a goal to exceedthat of Hayabusa.
4) Direct atmospheric entry from interplanetary space
Returning to Earth from interplanetary space, in the second time forJapan. Inheritance and development of atmospheric entry technology.
Additionally, deep space navigation provided a valuable opportunity toobtain many experimental engineering results, new operational
technology, and scientific results beyond that of asteroid science.

Hayabusa2 press briefing

8Hayabusa2 : science achievements: summary• The world’s first C-type asteroid rendezvous observation/in-situ measurement has
demonstrated for the first time that the parent body (planetesimal) of asteroid
Ryugu was an icy celestial body, and that this planetesimal underwent a major
migration from the outer to the inner Solar System. Ryugu formed by thereaccumulation of fragments of the parent body, and took on its current shapeduring high-speed rotation.
• The world’s first asteroid impact experiment produced a larger than expectedcrater, indicating that Ryugu consists of a loose collection of fragments from its
parent body, with a young surface age, and extremely weak adherence between theconstituent particles, and fragile boulders. This constrains the transport process ofwater and organic matter to the Earth.
• The returned sample is composed primarily of minerals that have experienced
alteration by water, and contain a variety of organic matter. It is the most primitive
cosmic sample yet obtained by humankind, and is expected to provide newstandard data on the abundance and isotopic composition of Solar Systemelements, and to provide a basis in material science for the theory of planetary
formation.
2022/6/29

Hayabusa2 press briefing

Asteroid Ryugu（credit: JAXA,
U. Tokyo, Kochi U,
Rikkyo U, Nagoya U,
Chiba Inst. Tech,
Meiji U, U. of Aizu, AIST)SCI crater（credit: JAXA, U. Tokyo,
Kochi U, Rikkyo U,
Nagoya U, Chiba Inst.
Tech, Meiji U, U. of Aizu,
Sokendai)

Largest grain in the Ryugu
sample, C9000（credit：JAXA）

9

Hayabusa2: science achievements: vicinity observation• Ryugu is a “rubble” object with many voids:
formed by the accumulation of debris (boulders)after the destruction of its parent body.
• The asteroid was spinning at high-speed in the past,and took on a spinning-top shape due to a landslideon the surface.
• Low reflectance and little regional difference inspectra (but colour difference between north andsouth) ⇒ Parent body was relatively homogenous
and undifferentiated.
• Infrared absorption of structural water (OH group)
can be seen over the entire surface ⇒ Suggests thatthe main components are hydrous minerals.
• Majority of the boulders have low thermal
conductivity and high porosity ⇒ Suggests ice
evaporated to form microscopic voids.
2022/6/29• The adhesive strength of the surface layer isextremely weak, but there is a layer with slightly
stronger strength at a depth of 1~ 2m (the key to thespinning top shape).
• Surface reddening correlated with solar irradiation⇒ Suggests space weathering.
• Spectral analysis suggests a likely origin is anasteroid family with a dark surface in the innerasteroid belt.
• Several bright boulders were found that may haveoriginated from S-type asteroids.
• Asteroid Bennu visited by NASA’S OSIRIS-Rex has
similarities (shape, density, hydrous minerals, etc)
and differences (water absorption, topology, directionof colour change due to space weathering etc).

Hayabusa2 press briefing

10Hayabusa2: science achievements: sample analysis• Close resemblance in composition and isotopic rations to the most primitive CI chondrites,
which retain the elemental abundances at the time of the formation of the Solar System.
– Some differences suggest terrestrial contamination and weathering of CI chondrites.
• Aqueous alteration occurred at several tens of degrees Celsius millions of years after theformation of the Solar System.
• The main component is hydrous silicate, with the majority of the secondary minerals formedin the presence of water, such as magnate, sulphides, and carbonates.
• A variety of organic matter is present in multiple forms, indicating that organic matter wasformed in the parent body and subsequently retained without being destroyed even on theasteroid surface.
• Ground-based analysis found that the grain porosity was about 40%, and the porosity between
grains constituting Ryugu can be estimated at about 20%.
• Ground-based analysis suggests that Ryugu’s parent body is likely to have been formed
outside the orbit of Jupiter and, combined with the results from vicinity observations, it islikely that the asteroid was subsequently brought into the asteroid belt. In other words, C-type
asteroids rich in volatiles could be a strong candidate for delivering oceans and materials forlife to the Earth.
• We plan to hold another press briefing to provide an overall picture of the analysis results of
the Ryugu sample once the initial results are completed.
• For the ground-based analysis, the comparative study with the Bennu sample will also be
important in the future.

C0002 grain（credit：JAXA）
2022/6/29

Hayabusa2 press briefing

11Hayabusa2: science achievements: Ryugu history
Solar Systemformation
Millions ofyears after
formation

Earth

Mars

10 million
years ago

Solar distanceFormation of parent
cestial body
Aqueous alteration

Move to inner asteroid belt (major migration of parent body)
Destruction of parent body(weak impact alteration)
Re-accumulation: Ryugu formed

CI chondrites
Sun-ward movement + Jupiter,
Saturn gravity
Near-Earth Asteroids

Time

Interplanetary dust

Synthesis of organics

High porosity
Weak cohesion

Spinning top shape formed
Crater formation / surface disturbance

Hayabusa2 exploration

CometsIce evaporation

High speed rotation (YORP*）

Primitive with minimum thermal alteration

Presolar grains

26Al decay heat

Gravitational scattering due to giant planet migration

Water and organics
supplied to Earth

Atmospheric destruction Space weathering†2022/6/29

Jupiter, Saturn

CAI/chondrule poor

1 billion
years ago
100 million
years ago

Asteroid belt

*YORP effect：
Change in axis and rotation
period due to heat radiation.
† Space weathering：
Deterioration of celestial bodysurface material due to cosmic
rays and micrometeoroids.
（credit：JAXA）

Hayabusa2 press briefing

12Hayabusa2: public relations / outreach
Public relations / outreach policy• The goal is not only to deepen understanding of the Project, but also promote interest in all space
exploration activities, and a broad interest in science.
• Communicate as much information as quickly and widely as possible.
• Communicate not only results and achievements, but also plans, schedules, and the challenges andrisks involved.
• Provide a wide range of people with the opportunity to enjoy different aspects of the project.

ImpactMajor public relations / outreach activities
Press briefings (60+), press conferences, and interviews
Web、Twitter（3 accounts）, JAXA publications, books
Real-time coverage (at major events)
Campaigns (10), lectures (more than 40)
Goods, illustrations, CG, videos and models
Mascot characters, Ryugu place names

・Numerous news reports, articles (newspaper, TV, magazines etc)
and programs
・Citations in books, textbooks etc
・ Documentaries （3 films）
・Twitter followers: 234,000 + 69,000 + 31,000
・Events sponsored by science museums etc.
・Activities by schools and the general public
・Local community contribution (Sagamihara City)

Capsule and sample public release2022/6/29

Hayabusa2 press briefing

13

Hayabusa2： publications & awards
Vicinity phase initial results papers

As of April 2022:• Hayabusa2 science and engineering papers (peer reviewed)
298 papers （1,079 abstracts）– Including science, engineering, joint science and engineering, and papers fromoutside the team (253 papers from the team)– Comparable result to NASA’s OSIRIS-Rex, which has 3 times the budget anddedicated paper writing team (301 papers, 10,091 abstracts)• In 2020-2021 especially, Hayabusa2 papers alone account for 10% of the world’s asteroid
papers.
– “asteroid” (1,432 papers) vs “Hayabusa2 or Ryugu” (144 papers)

S ci ence m a g a z i ne A p r i l 19,
2019 i s s ue

Na t ur e m a g a z i ne M a r ch 26,
2020 i s s ue

"Hayabusa2" engineering English book

• Awards（scientific and social recognition) ：57– International Awards: （IAF World Space Award, etc）
– Domestic awards: （Prime Minister‘s commendation, etc）
– Individual (young) awards: （Society awards, best paper awards, etc)
– Joint commendation with companies: (Japan Industrial Technology Awards, etc)
© E L S E V IE R 2022

2022/6/29

Hayabusa2 press briefing

14

Hayabusa2： summary video & pamphlet• Video and pamphlet summarising the Hayabusa2 mission have been released
Hayabusa2 –A 2195 day odysseyCG movie of the mission, from launch(December 3, 2014) to Earth return(December 6, 2020) with narration and liveaction footage at the beginning and end.
Run time about 14 minutes 30 seconds.

YouTube： https://youtu.be/imUy11NiPH4• Simultaneous release：Hayabusa summary video

Asteroid explorer Hayabusa –Looking back on a journey of 6 billion km Video summary of the Hayabusa mission with
live-action and CG with narration (Japaneseonly). Run time about 8 minutes.

YouTube： https://youtu.be/U_C2yDCSFtE
2022/6/29

Hayabusa2 press briefing

Pamphlet summarising themission（credit：JAXA）
15

Hayabusa2: utilization and development of results•

Future exploration revealed from the results of Hayabusa2–

Science： With the clarification of the identity of C-type asteroids, the importance of understanding
the diversity of primordial objects has become clearer.

→ The understanding of one primitive type revealed by Hayabusa2, the scientific power of sample return exploration can beused to elucidate diverse primordial bodies such as D-type, E-type, and comets.

–

Technology： NEO round-trip technology and flexible exploration opens the challenge of distant andlarger celestial body exploration.

→ Hayabusa2’s interplanetary round-trip and flexible exploration makes it possible to consider challenges of sample returnfrom small bodies beyond Mars, and advanced one-way exploration of more distant objects.

–

Exploration： Demonstrated the potential for activities that respond to social needs and issues
beyond science and technology.

→ With the technology for astronomical round-trip navigation, flight and landing near small celestial bodies, surface
movement on small bodies, and high speed collisions and evacuation, how will Japan tackle issues such as planetary
defence, space resources, and international space exploration?

–

Contribute to Japan’s Solar System exploration projects

2022/6/29

Hayabusa2 press briefing→ Contribute to the creation and advancement of recent projects (SLIM, MMX, DESTINY+, Hera, etc) and R&D
activities for future missions

16

2．Hayabusa2 Extended Mission• On June 30, the Hayabusa2 Project is formally dissolved andcompletely transferred to the Hayabusa2 Extended Mission Project.
• While the original project was under direct control of JAXA, the new
project is under the Institute of Space and Astronautical Science(ISAS).
• In the Hayabusa2 Extended Mission Project, we will continue tooperate the spacecraft as we head towards a new asteroid with theaim of promoting and developing the scientific results gained so far.
• The team leader of the Hayabusa2 Extended Mission Project willcontinue to be the Project Manager of Hayabusa2, Yuichi Tsuda.
2022/6/29

Hayabusa2 press briefing

17Hayabusa2 Extended Mission：Overview
Aim

Overview

New celestial body exploration
Promotion and development of theacademic value of the Hayabusa2
results
Long-term fuel saving, labor-saving
cruise operation, accumulation of
long-term operation results for inengines

orbit
roid
Aste

Acquire technical and scientific knowledge that till contribute to deep space long-term
navigation technology and planetary defence, and ultimately rendezvous with a rapidly
spinning asteroid.
・ Expansion of join scientific analysis activities for Hayabusa2 / OSIRIS-Rex samples
・ Establish facility to receive the OSIRIS-Rex sample
・ Enhance the international visibility of the Hayabusa2 science results
S/C orbit

Asteroid orbit

Asteroid super-close fly-by

Earth orbit？
Venus orbit

Multi-Earth swing-by

Fast rotating small asteroid rendezvous＜1998 KY26 properties＞
S h a pe
Spherical (from radar obs.)
Av. Diameter
About 30 m
Spin period
10.7 min (0.178hr)
Tumbling
No short-term variability
motiondetected
Possible carbonaceous asteroid
Spectral type

Fast rotating small asteroid approachand descent
Monolithic?

Accumulation?

Centrifugal force
exceeds gravity
Targetmarker（credit： Auburn University, JAXA）© Bennu Trek, JPL（画像クレジット：JAXA）

2022/6/29

Hayabusa2 press briefing

18

Hayabusa2 Extended Mission: Major Events

2026/7 2001CC21
Fly-byY(J2000EC)[AU]
Y [AU]

2031/7
1998 KY26
rendezvous

1

2028/6
Earth swing-by

0.5

0

-0.5

-1

（credit：JAXA）
PeriodEvent

2021/1〜
2026/7Y(Sun-Earth Fixed) [-]2020/12Extended mission start
2027/12
Earth swing-by

2001CC21
Earth
Venus
1998KY26
S/C

2001CC21
Earth
Venus
1998KY26
S/C

1
0.5
0
-0.5
-1

-1.5

-1

-0.5

0

0.5

X(J2000EC)[AU]
X [AU]

1

2031/7 1998 KY26
rendezvous
2020/12Extended mission start
2027/12
Earth swing-by
2028/6
Earth swing-by
2026/7 2001 CC21
Fly-by

-1.5

-1

-0.5

0

0.5

1

X(Sun-Earth Fixed) [-]1.5※figure where Sun and Earth are
fixed at the origin and at (1,0)

Engineering goals

Science goals

Long termnavigation

Acquisition of long-term fuel-saving / labour saving cruise operation
technology

2026/7

2001 CC21
Fly-by・ Acquisition of Japan’s first asteroid ultra-proximity high-speed fly-by
technology.
・Acquisition of technology that contributes to Planetary Defense

・ Understand dust spatial distribution from zodiacal lightobservations
・ Search for exoplanets

2027/12

Earth swing-by

・ Multi (3rd time) Earth swing-by technology

N/A

2028/6

Earth swing-by

・ Multi (4th time) Earth swing-by technology

Long-term performance evaluation of onboard scientific instruments
during cruising & passing celestial bodies.

2031/7

1998 KY26
rendezvous

・ Acquisition of high-speed rotation small asteroid exploration technology
・ Accumulation of technology that contributes to Planetary Defense

・Elucidate the formation & evolution of high-speed rotating asteroids
・Acquisition of science for Planetary Defense

2022/6/29

Hayabusa2 press briefing

Constrain characteristics of L-type asteroids in fly-by observations

19

Current status of spacecraft operation• Ion engine operation will start from 2022/6/28 (scheduled until around October)（Ion engine operation time for the Extended mission so far: about 5,000 hours)• Upon completion of ion engine operation for this time, the quota of the initial
mission phase of the Extended mission will be achieved. Operation will then bepaused until around 2025.
REF： Speed increase from ion engines up
to the approach of 2001 CC21
• Current（6/29） information
Sun distance： ~156,600,000 km
Earth distance： ~ 216,800,000 km
Total flight distance： ~6,818,000,000 km（flight distance since 2020/12/6：~1,541,000,000 km）
2022/6/29

PeriodAcceleration(sum)

2020/12/6〜2022/06/27~500 m/s~500 m/s

2022/6/28〜2022/10~100 m/s~600 m/s

2025 〜2001 CC21 approach~200 m/s~800 m/s

2001 CC21 approach 〜1998 KY26 arrival~500m/s~1300m/s

Hayabusa2 press briefing

20Hayabusa2 Extended Mission：Name• Official name
はやぶさ２拡張ミッション、Hayabusa2 extended mission• Spacecraft name
小惑星探査機「はやぶさ２」、Asteroid Explorer “Hayabusa2”• Team name
はやぶさ２拡張ミッションチーム、Hayabusa2 Extended mission team
• Mission nickname
はやぶさ2#、Hayabusa2# （Read： Hayabusa2 sharp）
Ø#（SHARP）＝Small Hazardous Asteroid Reconnaissance Probe（A spacecraft that investigates small but dangerous asteroids that may collide with the Earth)2022/6/29

Hayabusa2 press briefing

21

Hayabusa2 Extended Mission: OutreachLet's meet the Little Prince: Million Campaign 2#• Send your message to the Hayabusa2 spacecraft that will be written in thespacecraft’s memory.
• Messages will be accepted through the web interface, and an “Extended
Mission Ticket” will be issued upon receiving your message.
• Application period: scheduled for 2022/7/11〜12/6• Reference： Before the launch of Hayabusa2, the “Million Campaign 2” washeld to add names and messages to the target markers and re-entry capsule.
For Hayabusa, the “Million Campaign” added names to the target markers.
2022/6/29

Hayabusa2 press briefing22

3. Distribution of the Ryugu sample• 1st Ryugu sample research open call
– Background•2021/12/17: 1st international AO was issued.
•2022/3/25: Deadline to submit application “Notice of Intent”. Received 105 applications (from 19
countries).
•2022/4/22: Deadline for the open recruitment. Received 57 research proposals (12 countries).
– Results• After deliberation by the Ryugu Sample Research Announcement of Opportunity Committee (AO
Panel), 40 out of 57 proposals (9 countries, 74 samples, total of about 230mg) was selected. On June
13, 2022, this was approved by the Hayabusa2 Sample Allocation Committee (HSAC).
– Future schedule• Distribution of Ryugu samples will begin at the end of June.
• A total of four international AOs are planned, one every six months.
2022/6/29

Hayabusa2 press briefing

23

Ryugu sample distribution• 2nd Ryugu sample research open call
– Schedule• 2022/6/29: 2nd International AO issued. Published guidelines. Published list of first awardees (including
research themes).
• Early 2022/８: Call for Notice of Intent opens. Samples for research open to the public.
• 2022/10: Deadline for Notice of Intent applications.
• 2022/11: Deadline for research proposal applications.
• 2023/1: Results for the open call to be announced. Sample distribution started.
– Samples available for research in open call
• Individual grains (same as 1st International AO, stony sample).
• Aggregate sample (sand sample).
• Gas sample.
• Samples retuned after the initial analysis.
2022/6/29

Hayabusa2 press briefing24

4. Future plans■ Spacecraft operation schedule2022/6/28 〜2022/10 Ion engine operation
As required
Observations (zodiacal light, exoplanet)■ Press and media briefing
2022 TBD
Announcement of sample analysis papers (many)
Summary of science

2022/6/29

Hayabusa2 press briefing

25Reference

2022/6/29

Hayabusa2 press briefing

26

Overview of Hayabusa2(Illustration: Akihiro Ikeshita)

Objective
We will explore and sample the C-type asteroid Ryugu, which is a more primitive type than the S-type asteroid
Itokawa that Hayabusa explored, and elucidate interactions between minerals, water, and organic matter in theprimitive solar system. By doing so, we will learn about the origin and evolution of Earth, the oceans, and life, andmaintain and develop the technologies for deep-space return exploration (as demonstrated with Hayabusa), a field
in which Japan leads the world.
Expected results and effects
・By exploring a C-type asteroid, which is rich in water and organic materials, we will clarify interactions between
the building blocks of Earth and the evolution of its oceans and life, thereby developing solar system science.
・ Japan will further its worldwide lead in this field by taking on the new challenge of obtaining samples from acrater produced by an impacting device.
・We will establish stable technologies for return exploration of solar-system bodies.
Features:・World’s first sample return mission to a C-type asteroid.
・World’s first attempt at a rendezvous with an asteroid and performance of observation before and after projectile
impact from an impactor.
・Comparison with results from Hayabusa will allow deeper understanding of the distribution, origins, andevolution of materials in the solar system.
International positioning：
・Japan is a leader in the field of primitive body exploration, and visiting a type-C asteroid marks a newaccomplishment.
・This mission builds on the originality and successes of the Hayabusa mission. In addition to developing planetaryscience and solar system exploration technologies in Japan, this mission develops new frontiers in exploration ofprimitive heavenly bodies.
・NASA too is conducting an asteroid sample return mission, OSIRIS-REx (launch: 2016; asteroid arrival: 2018;
Earth return: 2023). We will exchange samples and otherwise promote scientific exchange, and expect further
scientific findings through comparison and investigation of the results from both missions.

2022/6/29

Hayabusa2 press briefing

Hayabusa 2 primary specifications
Mass
Approx. 609 kg
Launch3 Dec 2014
MissionAsteroid sample return
Arrival27 June 2018
Stay at asteroid Approx. 17 months
Departure.
13 November 2019
Earth return6 December 2020
Target body
Near-Earth asteroid Ryugu
Primary instruments
Sampling mechanism, re-entry capsule, optical cameras, laser
range-finder, scientific observation equipment (near-infrared,
thermal infrared), impactor, miniature rovers.

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Overall project schedule
2015

Schedule
overview

123

Initialoperation

Event

2016
10 12

EDVEGA2017

4
J o ur ney t o a s t er o i dlaunchEarth swing-by(Dec 3)

ESA（MLG/WLH）
Southern hemisphere station
test operations
operations (CAN/MLG)(May 21 - 22)
Oct
May
Jun

2019

Mar

2020

6 7approach

Swing-by(Dec 3)Ion engine operations※ Mar

2018

May

12

12

Re-ent r yEarth return

Asteroid proximity operations

Arrival at Ryugu

Departure from Ryugu(June 27)

(Nov 13)

Capsule re-entry(Dec 6, 2020)

Optical navigation Solar conjunction
May Jul Nov

Nov

Apr

Jan

Jun

Dec
Dec

Feb

May

Sept.

（image credit：JAXA）
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Hayabusa2 press briefing

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Mission flow
LaunchDec 3, 2014

Earth swing-by
Dec 3, 2015

Ryugu arrival
June 27, 2018

MINERVA-II1 separation
Sep 21, 2018

Target marker
separation
Oct 25, 2018

Ryugu
departure
Nov 13, 2019

Targetmarker
Dec. 6, 2020
MINERVA-II2 separation
separation
Sept. 17,
(image credit: illustrations including spacecraft
Oct. 3, 20192019
by Akihiro Ikeshita, others by JAXA)

Earth return2022/6/29

MASCOT
separation
Oct 3, 2018

Secondtouchdown
July 11, 2019
Hayabusa2 press briefing

Targetmarkerseparation
May 30,2019

Impactor (SCI)
5 April, 2019

First touchdown
Feb 22, 201929