Asteroid explorer Hayabusa2
Press Conference

December 4, 2020
JAXA Hayabusa2 ProjectHayabusa2 capsule separation operation
The spacecraft, spacecraft operation, re-entry capsule
recovery preparation work and ground systems are notexperiencing any problems. The re-entry capsule will
be separated and operated as planned.

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Hayabusa2 Press Conference2

Status of spacecraft re-entry• On December 1, orbit control withTCM-4 was performed and thespacecraft is on the plannedtrajectory.
• The orbit control amount in TCM4 is about 4.6 cm/s.
• TCM-4 adjusted the planned
landing area for the capsule by
33km to the south-east.
• Subsequent orbit estimation
confirmed the spacecraft is on theplanned trajectory.
    
2020/12/4

Hayabusa2 Press Conference3Sequence for capsule separation / departure from
Earth’s sphere (December 5)
291,000km

10:30JST
Re-entry
operation start

249,000km

 11:15JST
12:59JST
Switch to internal Large attitude changepower supply of Attitude to prepare forcapsule separation
capsule223,000km

14:13JST
Small attitude change
To capsule separation
attitude210,000km

14:30JSTcapsule separation→Large attitude change
To TCM5 attitude180,000km

ü When the capsule is separated, the attitude of thespacecraft will be greatly tilted (with respect to the Sun).
This ensures the capsule will be in the right position forentering the atmosphere.
ü After capsule separation has been confirmed, TCM5will be executed.
ü For implementing TCM5, permission will be obtained
to change the trajectory (after the start of the operationon that day) from the Commonwealth Return Safety
Officer (CSRO).

15:30-16:30JST
Large orbit control
TCM5 1st injection

16:00-17:00JST
Large orbit control
TCM5 2nd injection

16:30-18:00JST
Large orbit control
TCM5 3rd injection

 After completing TCM5
Large attitude change
To shadow standby attitude    
2020/12/4

Hayabusa2 Press Conference4Movement of spacecraft / capsule during re-entry(December 6)
Passing nearest point
Altitudearound 200-300km
Flight speed 11.7km/s

Passing th(a b o u ro u g h s h a dt 35 moinutes w)

Altitude120km

2:28:27 JST
Atmospheric entry
Altitude
120km
Flight speed 11.6km/s

Fireball imaging

2:28:492:29:25 JSTFireball phase
Altitude
80→40km
Flight speed 11.6km/s→3km/s

ü The brightness of the fireball is
uncertain as it depends on place andtime, but is estimated to be equivalent toa maximum of minus 7 ~ 9 mag.

Ballistic descent
Flight speed 3km/s→100m/s

Parachute descent phase
Altitude10km→surface
Flight speed 0.1m/s
 Beacon transmission

2:312:33 JST
Heat shield separation / Parachute deployment
Altitudearound 10km
Flight speed
100m/s→0.1m/s

Altitude 10km

2:472:57 JSTLandingParachute detachment    
2020/12/4

Hayabusa2 Press Conference5Capsule separation & re-entry schedule
EventScheduleTime (JST)Earth distance (altitude)

TCM-4 (orbit correction)

Dec 1 around 16:00

1,740,000 km

Capsule separation

Dec 5 14:30

220,000 km

TCM-5 (orbit control to depart fromthe Earth’s sphere)

Dec 5 15:30 ~ 18:00

200,000 ~ 160,000 km(spacecraft)

Spacecraft enters shadowed area

Dec 6 1:57

12,000km (spacecraft)

Capsule imaging

Dec 6 2:28 ~ 2:30

700km ~ 300km (spacecraft)

Spacecraft exits shadow

Dec 6 2:31350km (spacecraft)

Capsule atmospheric entry

Dec 6 2:28:27

120km (capsule)

Capsule : fireball phase

Dec 6 2:28:49 ~ 2:29:25

80 km ~ 40 km (capsule)

Parachute deployment

Dec 6 2:31 ~ 2:33

11~7km (capsule)

Capsule landing

Dec 6 2:47 ~ 2:57

0km (capsule)

The time of the fireball phase can have an error of several seconds due to orbit error, weather, etc.
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Hayabusa2 Press Conference

6Preparation for capsule collection
From Dec 1 to Dec 2, a recovery rehearsal was held in Woomera in real time.
Rehearsal flow Standby for headquarters, antenna stations, observation stations
 Measurements at each antenna station
 Estimation of landing point from measurement results
 Fly helicopter towards the landing point.
 Collected simulation capsule Transport capsule to QLF
Rehearsal results Overall flow of collection operation was confirmed.
 Minor corrections have been identified and will be reflected in the actual procedure.
e.g. communication of latitude and longitude of the landing point, etc.)
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Hayabusa2 Press Conference7

Preparation for capsule collection

Optical observations (GOS)    
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Transporting the collected sample from thehelicopter to QLF (Quick Look Facility)
Hayabusa2 Press Conference8Preparation for capsule collection“Sagamin” is also in the field    
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Hayabusa2 Press Conference

9Observation operation after the Earth swing-by
After capsule separation, observations and experiments will be conducted using thespacecraft’s onboard equipment.
The main observations and experiments are
Observations with the Optical Navigation Camera (ONC)• Earth imaging 12/6 ~06:30JST and “Goodbye Earth” observation12/6~
• Moon imaging 12/6~
• PurposeCalibration and public relations
Observations with the Thermal Infrared Imager (TIR)• Observations of the Earth & Moon 12/6~
• Purpose Calibration. Investigate the characteristics of the instrument and use this inRyugu data analysis.
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Hayabusa2 Press Conference

10Observation operation after the Earth swing-by
Continued
LIDAR optical link experiment• Experiment: After the return of Hayabusa2 to Earth, attempts will be made to send alaser beam from the ground station and receive it at Hayabusa2, and then to send a laser
beam from Hayabusa2 towards the ground and receive it at the ground station.
• Significance Aid in the development of laser range technology in space exploration.
• Cooperation National Institute of Information and Communications Technology
NICT, Australian, French, German observatories
Ground station National Institute of Information and Communications Technology
Koganei Station (Japan), Mount Stromlo Observatory (Australia),
L’Observatoire de Grasse (France), Geodetic Observatory Wettzell(Germany).
• Schedule Begin immediately after returning to Earth. Scheduled period is December 7~ 23. This may be cancelled depending on weather.
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Hayabusa2 Press Conference11SchedulePress conference
2020/12/6 16:30

JAXA Sagamihara campus

Online relay
2020/12/5 13:3016:40 (possible extension until 17:30) Capsule separation
2020/12/6 02:0003:10
Capsule fireball2020/12/4

Hayabusa2 Press Conference

12Reference

2020/12/4

Hayabusa2 Press Conference

13Observation of the re-entry fireball phase
App that displays the predicted trajectory of the re-entry capsule in AR (Augmented Reality)
Reentry ARfrom Toriningen When you select the observation site, the predicted trackof the fireball is displayed in AR.
 The expected brightness according to altitude is alsodisplayed.
App download iOS onlyJapaneseEnglishTrajectory when the observation site is Coober Pedy.
The background here is in front of the JAXA Sagamihara campus
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Hayabusa2 Press Conference

14Return cruise operation plan
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15

Operation plan for re-entry terminal guidanceCapsule separation
12/5 14:30 JST
220,000 km from Earth

Done

TCM-0

Orbit fine adjustmentusing RCS, same for later TCMs
(10/22, ~17M km from Earth)Orbit fine adjustment(11/12, ~9M km from Earth)

TCM-1

TCM-2

Te
(O rmin
cto albe Gur idanc)eP
haDoneDone
Targeting to Woomera(around 11/26, 3.6M km from Earth)

TCM-3

Change to Earth departure trajectory 12/5 15:30-18:00JST 
200,000~160,000 km from Earth

Orbit fine adjustment
Done(around 12/1, 1.74M km from Earth)

TCM-4

Capsuleseparation

seTCM-5• May change depending on conditions.
• At TCM-0,1,2, the spacecraft will enter an orbit that passes more than 200 km away from the Earth.
• After capsule separation, the spacecraft will divert from the reentry trajectory by TCM-5.
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Capsule landing12/6 2:47-2:57 JST 

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