S4-002Flight Status of Hayabusa2:Asteroid Sample Return Mission to C-type Asteroid Ryugu

Yuichi Tsuda, Makoto Yoshikawa(ISAS/JAXA)

Highlights of Hayabusa2

Hayabusa2 is the 2nd Japanese sample return mission to small body.JAXA launched Hayabusa2 in 2014, which will explore the C-type asteroid Ryugu (1999JU3), and will return back to the Earth in 2020.

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• Round-trip mission– High specific impulse ion engine for continuous-thrust trajectory control.

• In-situ science at “Ryugu”– 1.5year proximity operation at “Ryugu”– Four landers, four remote science instruments.

• Touch down & sample collection– Two normal touch down, one pin-point touch down (to the artificial

crater) are planned.• Artificial crater generation

– Kinetic impact on the asteroid surface to create a 2m-class crater.– Sub-surface structure of the asteroid can be acquired.

The spacecraft carriesan impactor.

The impactor collides to thesurface of the asteroid.

The sample will be obtainedfrom the newly created crater.

Launch The spacecraft observes the asteroid, releases the small rovers and the lander, and executes multiple samplings.

Earth Return

Sample analysis

Mission Scenario of Hayabusa2

Dec. 3, 2014

June-July 2018 : Arrival at Ryugu

2019

Nov.-Dec. 2020

New Experiment

Nov.-Dec. 2019 : Departure

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▲Dec. 3, 2015Earth swingby

Forward Trip Trajectory (Launch to Ryugu arrival)

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Sun

Launch(Dec.3, 2014)

Earth Swing-by(Dec.3, 2015)

Ryugu Arrival(Jun-Jul.2018)

Ryugu Orbit

Hayabusa2 Trajectory

Earth Orbit

Ion Engine Powered Cruise #1（Mar.22,～May.21, 2016）

Ion Engine Powered Cruise #2(Nov. 2016～May 2017)

Ion Engine Powered Cruise #3

I’m here!(June 28)

First Long-Term Ion Engine Burn Completed Successfully

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・～2016 Apr. Sothern hemisphere-only operation (using DSN Canberra，ESTRACK Malargue) finished

・2016 Mar 22 Long Term Ion Engine Burn #1 started→798.6 hours propulsive cruise,

total acc.=127.7m/s・2016 May 20 Long Term Ion Engine Burn #1 completed・2016 May 24 Mars pointing attitude・2016 Jun 9 Mars observation campaign finished, back

to Sun pointing attitude・2016 Jun-Jul Engineering Testing Operation

usingDSN/ESTRACK

Venus-Sun-Mercury-Earth-Hayabusa2-Mars Aligning (Syzygy ??)

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May 20, 2016

Mars photo taken by ONC-T

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June 7, 2016 10:50UTMars distance=41 million km

Prep. for Proximity Operation

• Two Types of Practice Planned– LSSP (Landing Sites Selection Process) Training

• Rapid consensus building and decision making among engineers and participating scientists for 3 TD, 3 lander deployment sites and cratering site.

• 6 months, offline workflow simulation participated by actual players, using a simulated asteroid model.

– H/HIL (Human/Hardware-In-the-Loop) Training• Wallclock practice for critical operations• Human / Hardware-interacted navigation and

guidance participated by actual operators using a simulated asteroid model.

• Real-time asteroid CG generation, TT&C round trip delay featured.

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A test CG (fake asteroid)

operators / project members

Hayabusa2 Timeline (Launch – Return)

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2015 2016 2017 2018 2019 2020

D 3 O D 4 6 7 D D

Event

Offline work schedule

EGA

Sothern hemisphere stations operation(CAN/MLG)O 5

3 6

(Dec.3)

4 6 D 5 N 6IES powered cruise

Ryugu Arrival(Jul.?)

Ryugu Departure(Dec.?)

Return(Dec.?)

Transfer Asteroid Proximity ReturnSWBY

Approach

Launch(Dec.3)

EDVEGACommis‐sioning

OpNAV6 7 1D

Solar conjunction blackout

D 2 7 O

Reentry

MLG/WLH X‐band compat. test (Apr.22‐25)

2014

• Global mapping• Gravity measurement• Mid/law altitude observation• MINERVA/MASCOT release• Touch down operation• Cratering operation• Conjunction operation

Prox operation planning

SOP generation training phase2

Prox opeation

EDL operation prep.

Prox operation tool devepment

Training phase1

Training planning

spare time

now

Ryugu Observation Campaign

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In this summer, (162173) Ryugu isin opposition, and it will be up tothe magnitude of 18th. Since this isthe last chance of observationsbefore Hyabusa2 arrives at Ryugu,we will have the observationcampaign of Ryugu from July 1 toAugust 15.

The ground observation team ofHayabusa2 will also try to observeRyugu.

Conclusion

• Hayabusa2 is flying normally. The first long term ion engine burn was completed successfully on May 21, 2016.

• The next ion engine burn will be in the next November, lasting for 6 months.

• Inorbit engineering testing and scientific observations are performed regularly to take full advantage of the interplanetary cruise opportunity.

• We are on schedule. Arrival at Ryugu will be June-July 2018.• We are planning two training for the prox. operation, LSSP and

H/HIL, for quick and reliable response / decision making.• Ryugu observation campaign (final opportunity before arrival) are

being planned in July-August this year.

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Collaboration with OSIRIS-REx Team

(162173) Ryugu (101955) Bennu

C-type B-type

Hayabusa2 OSIRIS-REx

CollaborationsScience

EducationOutreach

...

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Bon Voyage, OSIRIS-REx !