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1 Outline of the Next Asteroid Sample Return Mission - Hayabusa2! JAXA

2 Primitive Body Exploration Program considered in Japan! Post Hayabusa! Hayabusa! Hayabusa2! HayabusaMk2! ! ! S-type! C-type! D-type! Asteroid Belt! 2!

3 Spectral Types of Asteroids! D-type! Richer in organic materials Tagish Lake?! S-type like objects! S-type! Rock and metals Ordinary chondrite! Distance from the Sun! C-type like objects! Organic, hydrated minerals Carbonaceous chondrite! C-type! Asteroid classification by spectral types! 3!

4 History! idea of sample return : 1985! Serious troubles in Hayabusa! Year! Now! Started in 1996! MUSES-C! Post MUSES-C!! launch! Post Hayabusa! Hayabusa! Hayabusa Mk2! Marco Polo! Sample Analysis! Post Hayabusa2! Hyabusa2! Phase-B! Launch! Initial proposal in 2006 Copy of Hayabusa but modified Target : C-type asteroid 1999 JU3 Launch: 2010! New proposal in 2009 Modified Hayabusa adding new challenges Target : C-type asteroid 1999 JU3 Launch: 2014! 4!

5 Current Status of Hayabusa2! "May 2011 : Phase-B has started. "March 2012 : CDR of Hayabusa2 was finished. "April 2012 : We have started manufacturing of subsystem and system. "May 31- June 1, 2012 : COSPAR : Planetary Protection (colloquium) "July 14-22, 2012 : COSPAR : Planetary Protection "Jan. Apr : First interface test will be done. "Oct Sep : FM test "Dec : Launch (!) 5!

6 Objectives : Hayabusa vs Hayabusa-2! Hayabusa! Technological demonstrator "Round-trip to asteroid "Sample return Engineering "Ion engine "Autonomous navigation "Sample collection "Reentry capsule "Earth Gravity Assist with Ion Propulsion Science : Origin and evolution of the solar system "Remote sensing observation "Sample analysis! Hayabusa2! 1. Science " Origin and evolution of the solar system " Matter, Organic matter, H 2 O 2. Engineering " Technology : more reliable and robust " New challenge : ex) impactor 3. Exploration " Extend the area that human can reach "Spaceguard, Resources, Research for manned mission, etc.! 6!

7 Study of the origin of the solar system! 4.6 billion years ago...! Molecular cloud! Proto solar system disk! Solar system! 7!

8 Sun! History of Sun/Asteroid/Earth! Mol ecu lar clo ud cor e! Shrink age of interst ellar molec ular cloud! Asteroid! Proto star! Pro topl ane t syst em disk! Accretion of gas and dust from molecular cloud core! Bipolar molecular outflow! scattered disk gas! CTTS! Condensation melt and evaporation of dust! Adhesion/mixture! Formation of CAI! Formation of Chondrule! WTTS! For mat ion of pla net esi mal! Scattered to outside! Fall to center! Collision and growth of planetesimal! Formation environment and composition of parent asteroid! Missing For mat ion of par ent aste Zone! roid! Resolve the event in an early solar system caved for the asteroid. Clarify the appearance of the planetesimal and the parent asteroid.!! Collisional destruction and re-accumulation! metamorphism and differentiation by internal heating! Asteroid! Main sequence star! 10Ma! Supply of water and organism to the earth! Cosmic ray! Solar ray! Solar wind! Meteorite! Heating! space weathering! Correspondence of meteorite and asteroid! Orbital evolution! Near earth asteroid! Lifetime: 10Ma! Present! Earth! 4568Ma!4565Ma! CAI! Chondrule! 4563Ma! CMChondrite! Collision destruction accumulation! Proto Earth! 3800Ma! Ocean and life! Magma ocean! Sediment ary rock! 0.2Ma! Human! 8!

9 Hayabusa2 Mission Outline! Launch! Dec 2014! June 2018 : Arrival at 1999 JU3! The spacecraft observes the asteroid, deploys the small rovers and the lander, and executes multiple samplings.! The spacecraft carries an impactor.! New Experiment! Sample analysis! Earth Return! Dec. 2020! Dec : Departure! 2019! The impactor collides to the surface of the asteroid.! The sample will be obtained from the newly created crater.! 9!

10 Hayabusa2 Mission CG! 10! 10!

11 Hayabusa vs Hayabusa2 (1)! Hayabusa! Size 1m"1.6m"1.1 body Mass 510kg Wet! Hayabusa2! Size 1m"1.6m"1.25 body Mass 600kg Wet!!!!! Communication : X-band + Ka-band Ion engine : modified Small lander : MASCOT(Mobile Asteroid Surface Scout from DLR AOCS : 4 reaction wheels! 11!

12 Hayabusa vs Hayabusa2 (2)! Hayabusa! Hayabusa2!! Small Carry-on Impactor! 12!

13 ! 5!

14 Impactor! high speed debris high speed ejecta low speed ejecta! Separation mechanism! explosion! separation!! Impactor!!! 1999 JU3!!! 13!

15 Impactor experiment! half size case! explosion! trajectory! impact!! 14!

16 !!!!!!!!!! 6!

17 !! " " " " " 1ms 2km/s " 5kg 265mm!!!! 170mm!! 7!

18 Hayabusa2 : Nominal Payloads for Science! Payloads Specifications Comments Multiband Imager (ONC-T) Near IR Spectrometer (NIRS3) Thermal IR Imager (TIR) Wavelength: µm, FOV: 5.7 deg x 5.7 deg, Pixel Number: 1024 x 1024 px filter (ul, b, v, w, x, p, Wide) Wavelength: µm, FOV: 0.1 deg x 0.1 deg Wavelength: 8 12 µm, FOV: 12 deg x 16 deg, Pixel Number: 320 x 240 px Heritage of Hayabusa (modified) Heritage of Hayabusa, but but 3µm range is new Heritage of Akatsuki Laser Altimeter (LIDAR) Measurement Range: 50 m 50 km Heritage of Hayabusa (modified) Sampler Minor modifications from Hayabusa-1 Heritage of Hayabusa (modified) Small Carry-on Impactor (SCI) Separation Camera (DCAM) Small Rover (MINERVA II-1, II-2) Small Rover (MASCOT) Small system released form the spacecraft to form an artificial crater on the surface Small, detached camera to watch operation of Small Carry-on Impactor Similar to MINERVA of Hayabusa-1 (possible payload: Cameras, thermometers) Supplied from DLR & CNES MicrOmega, MAG, CAM, MARA New Heritage of Ikaros (modified) Heritage of Hayabusa (largely modified) New 15!

19 19!

20 20!

21 Target Asteroid : 1999 JU3! Rotation period: day (~7.6 h) Orbit! Itokawa!! ") (331, 20), (73, -62) Kawakami Model Mueller Model! Axis ratio = 1.3 : 1.1 : 1.0 Size : 0.87 ± 0.03 km Albedo : ± H=18.82 ± 0.021, G= ± Type : Cg! Mars! Earth! Shape model by Kawakami! (by Mueller et. al)! 16!

22 Target : Hayabusa vs Hayabusa2! (25143) Itokawa (1998 SF36) (162173) 1999 JU3 Type S Cg Spin period day (~12.13 h) day (~7.6 h) Spin axis orientation (deg) (128.5, -89.6) Size 535 # 294 # 209 (m) Mars! (331, 20), (73, -62) Kawakami Model Mueller Model 0.87 ± 0.03 km 1.3 : 1.1 : 1.0 Albedo 0.25 ± ± Earth! H : absolute magnitude (mag) Mass (kg) # 10 10? (4.8 # ) GM (km 3 /s 2 ) 2.34 # 10-9? (32 # 10-9 ) Density (g/cm 3 ) 1.90 ± 0.13? (1.4) q : perihelion dist. (AU) Q : aphelion dist. (AU) i : inclination (deg) a : semimajor axis (AU) T : orbital period (year) !

23 Target : Hayabusa vs Hayabusa2! Shape and size! 1999 JU3! Itokawa!!!!! 18!

24 Spectrum of 1999 JU3! Binzel (2001), Vilas (2008)! 1.4! IRTF! MMT! 1.2!! 1.0! 0.8! 0.5! 1.0! 1.5! 2.0!! 2.5! Ground observation has suggested existence of a 0.7-micrometer hydratedmineral absorption band.! 19!

25 1999 JU3 in 2011! by S. Abe at Lulin Observatory in Taiwan. Aug. 22, 2011 Mag. : 20! Observation periods: 2011: Aug/E Oct/E 2012: Spring - Summer! new observations!! 20!

26 International Cooperation on Hayabusa2! USA! NASA! Europe! DLR CNES! Australia! SLASO/DIISR DoD/AOSG AQIS/AC! 21!

27 Asteroid Sample Return Missions!!!! future! JAXA!!!! NASA!! ESA!! 22!

28 Summary! StartingP oint 1985! Hayabusa ! Hayabusa ! The cover of the proceedings of the meeting for asteroid sample return held in ISAS in 1985.! 23!

29 Importance of Small Solar System Bodies! Science To study the origin and evolution of the solar system and the life! Spaceguared To protect the earth from the collision of the solar system small bides! Resource To utilize the mineral, metal and water, etc.! Manned mission To be the target of manned mission before manned mission to Mars! Engineering To move in the interplanetary space freely! Culture To create new culture and educate new generation! 24!

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