Asteroid explorer, Hayabusa2,reporter briefing

March 5, 2021
JAXA Hayabusa2 ProjectTopics
Current status of the project overview
1. Curation work
2. Analysis of the re-entry capsule
3. Public viewing of the re-entry capsule
4. Memory chip data search system
5. Future plans

2021/3/5

Hayabusa2 reporter briefing

2Project current status (overview)
Spacecraft operation• The spacecraft is progressing with the extended mission (steadyoperation).
Curation work
• Proceeding with the weight measurement and acquisition of highdefinition optical microscope images of the particles and bulk powder
sample from Ryugu, focusing on the particles in chamber C recoveredfrom the second touchdown point.
• The website for the Astromaterials Materials Science Research Group has
been renewed: <https://curation.isas.jaxa.jp/>2021/3/5

Hayabusa2 reporter briefing31. Curation work

• The sample in chamber C was placed in observation containers(3 dishes in total: see figure below), and the weight measurement
and optical microscope observations were started.
   

0.56 g0.44 g0.51 g                ! 
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Hayabusa2 reporter briefing4

2. Analysis of the re-entry capsule• Post-flight analysis is being conducted on the re-entry capsule collected inAustralia to accumulate technology for future engineering research and missions.
• The condition of each capsule part is generally good. The onboard equipment has
been confirmed to be functioning normally, even after returning to Sagamihara.
Currently, a detailed analysis of the condition of the heat shield is underway.

2021/3/5

Credit: JAXA

Credit: JAXA

Credit: JAXA

Forebody heatshield

Aftbody heatshield

Instrument module structure

Hayabusa2 reporter briefing5

2. Analysis of the re-entry capsule• Engineering data from the “Reentry Environment Measurement Module”(REEM) that was mounted on the re-entry capsule has been recovered andconfirmed to have been successfully collected. This was designed to measure
the airframe motion and temperature of each part of the capsule during thehigh-speed re-entry into the atmosphere.
n REMM acquisition data overview• Acquired data
Acceleration / angular velocity 125Hz
Temperature data at 9 locations within thecapsule (1Hz)• Acquisition period: 420 seconds before & after reentry.
• Data volume Approximately 1 MB
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Hayabusa2 reporter briefing

Credit: JAXA

Equipment onboard the re-entry capsule(top is REMM)

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2. Analysis of the re-entry capsule• Analysis of the data acquired by REMM confirmed that the insideof the re-entry capsule (including the sample stored in the sampler)maintained a temperature environment that did not greatly exceed
room temperature from re-entry to landing.
• Analysis of the REMM acquisition data will continue in detail andbe utilized for the research and development of future re-entryvehicles.

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Hayabusa2 reporter briefing7

3. Public viewing of the re-entry capsule
The re-entry capsule that returned to Earth can
now be seen on display:• Sagamihara City Museum2021/3/123/16• National Science Museum2021/3/274/11

Exhibition contentsForebody heatshieldAftbody heatshield
Instrument moduleExcluding the sample container and on-board electronicequipment section)

Onboard electronic equipment section
ParachuteCapsule and parachute as found in theWoomera desert, Australia.

image creditJAXA

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Hayabusa2 reporter briefing84. Memory chip data search system• The re-entry capsule was equipped with memory
chips containing electronic files of names andmessages. see next page• On February 19, the memory chips embedded in thesupport ablator of the re-entry capsule were removed.
• When the contents of the extracted memory chips (2chips) were read, the files on both chips could beaccessed normally (the contents of both chips are thesame).
• We are designing a system to allow you to search thewritten names and messages.
    
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Hayabusa2 reporter briefing

Removal of the memory chips
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4. Memory chip data search system

Reference: Little Prince Million Campaign 2  Recruitment2013/4/10 - 2013/8/9
1. Include a sheet of names inside thetarget markers
2. Include a memory chip with names,messages, illustrations and photo files
in the re-entry capsule.
   Campaign poster 

the deadline was extended to August 9, 2013     
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Hayabusa2 reporter briefingTotalsubmissions

JapanOverseas

Target marker

183,174

123,661

59,513Re-entry capsule

226,800

170,279

56,521

Total

409,974
255,139

293,940
194,889

116,034
60,240

(net number ofregistrants)

Area

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5. Future plans■ Operation schedule
2021/3
Continue with regular operation■ Press and media briefings
2021/3/19
Press briefing @ online

2021/3/5

Hayabusa2 reporter briefing

11Reference

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Hayabusa2 reporter briefing

12Overview of Hayabusa2
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 positioningJapan 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 furtherscientific findings through comparison and investigation of the results from both missions.

2021/3/5

Hayabusa2 reporter briefing(Illustration: Akihiro Ikeshita)

Hayabusa 2 primary specifications
MassApprox. 609 kg
Launch3 Dec 2014
MissionAsteroid return
Arrival27 June 2018
Deoarture
13 Mov 2019
Earth return6 Dec 2020 (plan)
Stay at asteroid Approx. 18 months
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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Current project status & schedule overview
Scheduleoverview

2015
12

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Hayabusa2 reporter briefing

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Mission flow
LaunchDec 3, 2014

Earth swing-by
Dec 3, 2015

MINERVA-II1 separation
Sep 21, 2018Ryugu arrival
June 27, 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 return2021/3/5

MASCOT
separation
Oct 3, 2018

Secondtouchdown
July 11, 2019

Targetmarker
separation
May 30,2019

Hayabusa2 reporter briefing

Impactor (SCI)
5 April, 2019

First touchdown
Feb 22, 201915

Clean chamber overview
CC3-1
Opening the sample container undervacuum environment
CC3-2
Sample collection under vacuum
CC3-3
Transition from vacuum to nitrogenenvironment
CC4-1
Handling of submillimeter-sizedparticles

 CC4-2
Handling / observation / sorting ofrelatively large particles (> mm)  

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Hayabusa2 reporter briefing

16Catcher opening operationA
B
C

Particles areconfirmed
from abovechamber Ap

The sample catcher was moved to clean chamber CC3-2, and the lid of sample catcher chamber A was opened invacuum conditions.

pMany particles are confirmed to be in chamber A. This is thought to be the sample collected during Touchdown#1 on Ryugu.

pPart of the sample was picked up in Chamber A to be stored in vacuum in its present condition.

p

From here, we will move to chamber CC3-3, remove the samples from chamber A in a nitrogen environment,and open chambers B and C.

    
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Hayabusa2 reporter briefing

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Observation container

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Hayabusa2 reporter briefing

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Re-entry capsule overview• The re-entry capsule carrying a container holding the asteroid samples will re-enter the Earth’s
atmosphere at a speed of 12 km/s and is recovered on the ground.
• The capsule separates from the spaceship while spinning at one revolution per 3 seconds. It canwithstand the aerodynamic heating during re-entry, and opens a parachute at an altitude of about 10 km,
allowing it to gently descend and land while emitting a radio wave beacon signal for positional search.
Samplecontainer
AFT-TPS (Parachute Cover)Sample Container
Aftbody(Carbonheatshield• The basic design follows that of Hayabusa,Phenolic)but in addition to improving the reliability
W=17W=17 kgkg
Mass~16kg
W: 約16.5kg
Dia=400
Dia=400 mm
mmof the on-board equipment, the parachute
Dia :H=200
400mm
mm
Diameter~400mm
H=200 mmopening trigger (signal) method, and related
H = 200mm
Height~200mm
equipment, a new re-entry environment
measurement module (REMM) were
Onboard equipment
installed.
(including Electronics
REMM)
 The entire part of the re-entry capsule that issuspended by the parachute and slowly descents is called
the “instrument module” (sampler container, on-board
equipment etc, are stored inside)

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parachute
ParachuteInsulator
FWD-TPS (Carbon Phenolic)insulation Forebody heatshield

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Searching for names mounted in the target markers• You can search for your name on the sheets mounted within the targetmarkers.
• https://www.haya2-campaign.jp/

Sheets mounted within the target markers

The block chart showing the location of your name.

    
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Hayabusa2 reporter briefing

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