Nakamura, E. et al. (2012) Space environment of an asteroid preserved on micrograins returned by the Hayabusa spacecraft, Proceedings of the National Academy of Sciences of the United States of America, 101, E624-E629, doi: 10.1073/pnas.1116236109. < 20120224095412-627-620 > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    Records of micrometeorite collisions at down to submicron scales were discovered on dust grains recovered from near-Earth asteroid 25143 (Itokawa). Because the grains were sampled from very near the surface of the asteroid, by the Hayabusa spacecraft, their surfaces reflect the low-gravity space environment influencing the physical nature of the asteroid exterior. The space environment was examined by description of grain surfaces and asteroidal scenes were reconstructed. Chemical and O isotope compositions of five lithic grains, with diameters near 50 µm, indicate that the uppermost layer of the rubble-pile-textured Itokawa is largely composed of equilibrated LL-ordinary-chondrite-like material with superimposed effects of collisions. The surfaces of the grains are dominated by fractures, and the fracture planes contain not only sub-µm-sized craters but also a large number of sub-µm- to several-µm-sized adhered particles, some of the latter composed of glass. The size distribution and chemical compositions of the adhered particles, together with the occurrences of the sub-µm-sized craters, suggest formation by hypervelocity collisions of micrometeorites at down to nm scales, a process expected in the physically hostile environment at an asteroid's surface. We describe impact-related phenomena, ranging in scale from 10-9 to 104 meters, demonstrating the central role played by impact processes in the long-term evolution of planetary bodies. Impact appears to be an important process shaping the exteriors of not only large planetary bodies, such as the moon, but also low-gravity bodies such as asteroids.

  • doi: 10.1073/pnas.1116236109
  • modified at 16 h ago
Pom 0020 thumb RA-QD02-0093 < 20110416134901-075-241 >pub
  • classification: chondrite:ordinary
  • physical-form: grain
  • status: (unknown)
  • modified at 2016-02-20
Pom 0026 thumb RA-QD02-0095 < 20110416134955-320-347 >pub
  • classification: chondrite:ordinary
  • physical-form: grain
  • status: (unknown)
  • modified at 2016-02-20
Xx 121 e003 004 thumb RA-QD02-0121 < 20110502190426-620-791 >pub
  • classification: chondrite:ordinary
  • physical-form: grain
  • status: (unknown)
  • modified at 2016-02-20
Xx 118 e002 007 thumb RA-QD02-0118 < 20110502190415-958-990 >pub
  • classification: chondrite:ordinary
  • physical-form: grain
  • status: (unknown)
  • modified at 2016-02-20
Xx 116 e004 007 thumb RA-QD02-0116 < 20110502190443-012-746 >pub
  • classification: chondrite:ordinary
  • physical-form: grain
  • status: (unknown)
  • modified at 2018-12-20
Ol 121 e003 b 002 thumb en-ol-E003b < 20110518194205-602-801 >pub
  • classification: mineral
  • physical-form: fraction
  • status: (unknown)
  • modified at 2020-05-09
Ref gl ab thumb ref-gl-ab1 < 20110518194323-577-749 >pub
  • classification: glass
  • physical-form: grain
  • status: (unknown)
  • modified at 2020-05-09
Ref ol fk1 thumb ref-ol-fk1 < 20110518194217-336-786 >pub
  • classification: mineral:olivine
  • physical-form: fraction
  • status: (unknown)
  • modified at 2020-05-09
Ref cpx klb1 thumb ref-cpx-klb1 < 20110518194229-899-182 >pub
  • classification: mineral:pyroxene
  • physical-form: on mount
  • status: (unknown)
  • modified at 2020-05-09
Ref ol fo1 thumb ref-ol-fo1 < 20110518194221-681-398 >pub
  • classification: mineral:olivine
  • physical-form: fraction
  • status: (unknown)
  • modified at 2020-05-09
Ref ol sc1 thumb ref-ol-sc1 < 20110518194211-103-187 >pub
  • classification: mineral:olivine
  • physical-form: fraction
  • status: (unknown)
  • modified at 2020-05-09
Tk ol 93b2 thumb ol-93-b2 < 20110504162624-381-204 >pub
  • classification: mineral
  • physical-form: fraction
  • status: (unknown)
  • modified at 2020-05-09
Mount k002 b 45 thumb en-px-K002-b < 20110507160030-688-523 >pub
  • classification: mineral
  • physical-form: fraction
  • status: (unknown)
  • modified at 2020-05-09
Gl dr1a1 thumb ref-gl-dr1a1 < 20090223093036.hkitagawa >pub
  • classification: synthetic:glass
  • physical-form: on mount
  • status: (unknown)
  • description: This stone is glass re-molten to homogenize chemical compositions.
  • modified at 2020-05-09
Ol mw sc5 reflect thumb ol-MW-sc5 < 20080404232348.mw >pub
  • classification: mineral:olivine
  • physical-form: on mount
  • status: (unknown)
  • description: Previous label was `SC D'. \abundance[\ppm]{Li} = 2.5 (Maruyama et al, 2009)
  • modified at 2020-05-09
Ref gl tahiti thumb ref-gl-tahiti < 20110407093831-292-272 >pub
  • classification: glass
  • physical-form: on mount
  • status: (unknown)
  • description: On half-inch resin disk, which is on SIMS(5f) holder as a working standard
  • modified at 2020-05-09
Img 0988 thumb ref-grt-HK5206701d < 20100514093423660.tota >pub
  • classification: mineral:garnet
  • physical-form: on mount
  • status: (unknown)
  • modified at 2020-05-09
Ap durango opt thumb ref-ap-durango < 20130628144453-349172 >pub
  • physical-form: on mount
  • status: (unknown)
  • modified at 2020-05-09
Ref grt mnag10 thumb ref-grt-mnag10 < 20131011173339-925539 >pub
  • classification: mineral:garnet
  • physical-form: on mount
  • status: (unknown)
  • modified at 2020-05-09
Img 2353 thumb myk1-1 < 20101021094558025.hkitagawa >pub
  • physical-form: on mount
  • status: (unknown)
  • modified at 2020-05-09
Img 2354 thumb myk1-2 < 20101021094557357.hkitagawa >pub
  • physical-form: on mount
  • status: (unknown)
  • modified at 2020-05-09
Img 2357 thumb myk1-5 < 20101021094557533.hkitagawa >pub
  • physical-form: on mount
  • status: (unknown)
  • modified at 2020-05-09
Vhx 000008 thumb ol-fa-hk-1 < 20110401173434-288-226 >pub
  • physical-form: on mount
  • status: (unknown)
  • modified at 2020-05-09
En px e002 b thumb en-px-E002-b < 20110514185257-135-219 >pub
  • classification: mineral
  • physical-form: fraction
  • status: (unknown)
  • modified at 2020-05-09
Optical thumb cpx-sag30 < 20090313101750331.hkitagawa >pub
  • classification: mineral:pyroxene
  • physical-form: on mount
  • status: (unknown)
  • description: Clinopyroxenes are picked from xenolith (Malalite, Solomon) and mounted by A. Ishikawa.
  • modified at 2020-05-09
Gl hawaii thumb ref-gl-hawaii < 20090223093028.hkitagawa >pub
  • classification: glass
  • physical-form: on mount
  • status: (unknown)
  • description: \abundance[cg/g]{SiO_2} = 51.22, \abundance[cg/g]{MgO} = 8.1, \abundance[\ppm]{Li} = 4.41 (as "HW11-3"; Green Binder et al., 2009)
  • modified at 2020-05-09
Img 8271@7a5d30d9533198434133324 thumb gl-NIST-610 < 20090318093433148.hkitagawa >pub
  • classification: synthetic:glass
  • physical-form: grain
  • status: (unknown)
  • modified at 2020-05-09
Ref cpx sax39 thumb ref-cpx-sax39c < 20130628150759-626481 >pub
  • classification: mineral:pyroxene
  • physical-form: on mount
  • status: (unknown)
  • modified at 2020-05-09
Gl pjr1 thumb ref-gl-pjr1 < 20120228145231-547-537 >pub
  • classification: glass
  • physical-form: on mount
  • status: (unknown)
  • modified at 2020-05-09
Img 3551 thumb opx-KLB1 < 20110415092805-368-694 >pub
  • classification: mineral:pyroxene
  • physical-form: on mount
  • status: (unknown)
  • description: Formally known as 'KLB-1 Opx'.
  • modified at 2020-05-09
name box-type global-id
binder of Space environment of an asteroid preserved on micrograins returned by the Hayabusa spacecraft by Nakamura et al., 2012 pub container 20181218102728-176918
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11 pub (10.47, 35.61) 20120224172052-995-787
782 pub (8.59, 32.31) 20120224171957-669-611
783 pub (-3.21, 21.00) 20120224172026-053-377
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name coordinate global-id
802 pub (0.12, 13.12) 20120222195434-286-367
1 pub (-0.81, 12.09) 20120222195226-421-017
name device size global-id
in-situ O isotope for Ol0.5 low-Ca Px0.5 pub SIMS Cameca ims-1270 3 20120222194521-900-286
in-situ O isotope for Ol0.95Pl0.05@694 pub SIMS Cameca ims-1270 3 20120223193244-229-984
in-situ O isotope for Di@755 pub SIMS Cameca ims-1270 3 20110520073816-799-968
recommended pub EPMA JEOL JXA-8800R 8 20110613192109-655-196
ref_gl_dr1a1 pub 36 20110615111915-339-687
MYK1-1 pub 12 20150518154615-539156
recommended pub EPMA JEOL JXA-8800R 9 20110613191326-202-203
recommended pub EPMA JEOL JXA-8800R 4 20110613185621-472-216
recommended pub EPMA JEOL JXA-8800R 3 20110512123959-639-395
recommended Oxygen pub SIRA Thermo-Fisher MAT253 2 20181225152250-294105
in-situ O isotope for low-Ca Px@782 pub SIMS Cameca ims-1270 3 20110524102434-601-562
MYK1-2 pub 12 20150518154620-379580
recommended pub EPMA JEOL JXA-8800R 9 20110613191542-621-324
ref-cpx-sag30 pub 36 20170302123831-952084
recommended pub EPMA JEOL JXA-8800R 9 20110613192614-927-476
recommended pub EPMA JEOL JXA-8800R 6 20110613185827-748-007
ref_gl_tahiti pub 36 20110615111919-540-763
ref-gl-hawaii pub 36 20170302123951-269762
recommended pub EPMA JEOL JXA-8800R 8 20110613192303-465-441
MYK1-5 pub 11 20150518154632-477314
recommended pub EPMA JEOL JXA-8800R 8 20110613191722-923-959
ref_grt_hk5206701d pub 7 20110615111920-262-240
ref-grt-HK5206701d pub 27 20170302124150-575797
recommended pub EPMA JEOL JXA-8800R 6 20110613190553-076-244
recommended pub EPMA JEOL JXA-8800R 4 20110613191026-753-748
ref_gl_nist610 pub 6 20110615111918-029-443
recommended pub EPMA JEOL JXA-8800R 5 20110613192759-599-020
ref-cpx-sax39c pub 40 20170302123857-082875
recommended pub EPMA JEOL JXA-8800R 9 20110613191919-113-030
XCa pub EPMA JEOL JXA-8530F 1 20190527141542-189630
dLi pub ICPMS Thermo-Fisher Neptune 2 20190527141519-913716
XMg pub EPMA JEOL JXA-8530F 1 20190527141530-369748
ref-grt-MNAG10 pub 36 20170302124204-099320
ol-fukang1 O pub SIRA Thermo-Fisher MAT253 2 20181226154111-671503
ol-fukang1 pub EPMA JEOL JXA-8800R 4 20181226153923-518234
recommended pub EPMA JEOL JXA-8800R 9 20110613192432-696-698
ref_cpx_klb1_O pub SIRA Thermo-Fisher MAT253 2 20181226103155-932696
ref_cpx_klb1 pub 33 20110615111911-316-852
recommended pub EPMA JEOL JXA-8800R 3 20181225103518-554718
recommended Oxygen pub SIRA Thermo-Fisher MAT253 2 20181225103716-452965
recommended Oxygen pub SIRA Thermo-Fisher MAT253 2 20181225103054-197751
recommended pub EPMA JEOL JXA-8800R 5 20181225102826-333615
recommended pub EPMA JEOL JXA-8800R 8 20110613191145-833-467
recommended pub EPMA JEOL JXA-8800R 10 20110430144125-274-231
opx-klb1 O pub SIRA Thermo-Fisher MAT253 2 20181226150306-813544
in-situ major for Di (grain C) pub EPMA JEOL JXA-8800R 10 20110524114438-320-176
in-situ major for Ol (grain A) pub EPMA JEOL JXA-8800R 5 20181219093228-229439
in-situ major for low-Ca Px (grain D) pub EPMA JEOL JXA-8800R 9 20110524100614-070-354
in-situ major for Kfs (grain C) pub JEOL JSM-7001F SEM-EDS 7 20181219101611-877512
in-situ major for low-Ca Px (grain A) pub EPMA JEOL JXA-8800R 8 20181219093741-080896
in-situ major for diaplectic plagioclase (grain C) pub JEOL JSM-7001F SEM-EDS 8 20120223183145-756-686
in-situ major for Ol (grain B) pub EPMA JEOL JXA-8800R 5 20181219143354-970504
in-situ major for Pl (grain B) pub EPMA JEOL JXA-8800R 9 20120223181117-211-514
in-situ trace for Ol0.5 low-Ca Px0.5 pub SIMS Cameca ims-5f 14 20120222192429-444-319
in-situ SiO2 pub EPMA JEOL JXA-8800R 1 20181219121517-863630
In-situ trace for Ol0.9Pl0.1@3 pub SIMS Cameca ims-5f 5 20120224161128-881-454
in-situ O isotope for Ol0.8Pl0.2@721 pub SIMS Cameca ims-1270 3 20120223193537-455-422
in-situ O isotope for Ol0.6Pl0.4@723 pub SIMS Cameca ims-1270 3 20120223193712-447-283
in-situ O isotope for Ol0.8Pl0.2@720 pub SIMS Cameca ims-1270 3 20120223193413-873-104
in-situ SiO2@3 pub EPMA JEOL JXA-8800R 1 20181219140058-578587
in-situ O isotope for diaplectic plagioclase@765 pub SIMS Cameca ims-1270 3 20110520074012-809-874
in-situ O isotope for Di@756 pub SIMS Cameca ims-1270 3 20110520073916-637-498
in-situ O isotope for low-Ca Px@783 pub SIMS Cameca ims-1270 3 20110524103255-303-452
In-situ trace for Ol@2 pub SIMS Cameca ims-5f 14 20120224161128-468-643
in-situ SiO2@2 pub EPMA JEOL JXA-8800R 1 20181219140937-240830
In-situ trace for Pl@4 pub SIMS Cameca ims-5f 12 20120224161128-138-577
In-situ trace for Pl0.3Ol0.7@5 pub SIMS Cameca ims-5f 6 20120224161128-313-215
in-situ trace for Pl0.6Ol0.4@6 pub SIMS Cameca ims-5f 6 20181219145943-625527
in-situ SiO2@6 pub EPMA JEOL JXA-8800R 1 20181219150001-281976
in-situ SiO2@5 pub EPMA JEOL JXA-8800R 1 20181219145428-800838
in-situ SiO2@4 pub EPMA JEOL JXA-8800R 1 20181219144917-729637
In-situ trace for Di@7 pub SIMS Cameca ims-5f 15 20120224165505-011-632
In-situ trace for Di@8 pub SIMS Cameca ims-5f 29 20120224165505-288-138
In-situ trace for diaplectic Pl@9 pub SIMS Cameca ims-5f 26 20120224165505-185-048
In-situ trace for Pl0.95Di0.05@10 pub SIMS Cameca ims-5f 3 20120224165506-316-241
in-situ SiO2@7 pub EPMA JEOL JXA-8800R 1 20181219150923-932038
in-situ SiO2@9 pub EPMA JEOL JXA-8800R 1 20181219152002-780910
in-situ SiO2@8 pub EPMA JEOL JXA-8800R 1 20181219151457-242642
in-situ SiO2@10 pub EPMA JEOL JXA-8800R 1 20181219152044-573720
In-situ trace for low-Ca Px@11 pub SIMS Cameca ims-5f 13 20120224171743-453-301
In-situ trace for low-Ca Px@12 pub SIMS Cameca ims-5f 2 20120224171743-270-386
In-situ trace for low-Ca Px@13 pub SIMS Cameca ims-5f 3 20120224171743-978-832
in-situ SiO2@11 pub EPMA JEOL JXA-8800R 1 20181219152658-240030
in-situ SiO2@13 pub EPMA JEOL JXA-8800R 1 20181219152721-048069
in-situ SiO2@12 pub EPMA JEOL JXA-8800R 1 20181219152711-183903
E004-pos45deg50T-2 pub JEOL JSM-7001F SEM-EDS 6 20181220105401-257806
E004-23-7 pub JEOL JSM-7001F SEM-EDS 7 20181220105401-189154
E004-22-6 pub JEOL JSM-7001F SEM-EDS 7 20181220105401-851783
E004-22-5 pub JEOL JSM-7001F SEM-EDS 4 20181220105401-686678
E004-AG-1-1 pub JEOL JSM-7001F SEM-EDS 4 20181220105402-027316
E004-pos0deg0t-1-2 pub JEOL JSM-7001F SEM-EDS 7 20181220105402-014515
E004-24-9 pub JEOL JSM-7001F SEM-EDS 8 20181220105401-887549
E004-24-8 pub JEOL JSM-7001F SEM-EDS 6 20181220105401-636024
Li isotopic ratio pub ICPMS Thermo-Fisher Neptune 2 20130208180512-081-451
name spots global-id
F1.large thumb F1.large.jpg pub 0 20190108094115-434576
caption ID assembly stone
Table S1.Major element compositions of the Itokawa grains pub 20181219094303-294307 major by EMPA (Itokawa Table S1) 8
Table S3. Results of in-situ O isotope analyses pub 20181219110039-527168 oxygen (Itokawa Table S3) 10
Table S5. Geochemical properties of the reference glasses and minerals pub 20181225094629-405342 major-trace of ref (Itokawa TableS5) 21
Table S7. Chemical compositions of the Itokawa grains determined using the Cameca ims-5f ion microprobe pub 20181219120001-182930 major-trace by 5f (Itokawa TableS7) 13
Table S9. Major element compositions of the merrillite in the PIC pub 20181220105859-969128 major by FE-SEM-EDS (Itokawa Table S9) 8
manual
  • name
  • Nakamura, E.
  • Makishima, Akio
  • Moriguti, Takuya
  • Kobayashi, Katsura
  • Tanaka, Ryoji
  • Kunihiro, T.
  • Tsujimori, Tatsuki
  • Sakaguchi, C.
  • Kitagawa, Hiroshi
  • Ota, T.
  • Yachi, Y.
  • Yada, T.
  • Abe, M.
  • Fujimura, A.
  • Ueno, M.
  • Mukai, T.
  • Yoshikawa, M.
  • Kawaguchi, J.