HISAKI Project Team
Profile Information
- Affiliation
- Aerospace Project Research Associate, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency
- Degree
- Ph.D.(2021, Nagoya University)
- Researcher number
- 20944549
- ORCID ID
https://orcid.org/0000-0002-3094-6716- J-GLOBAL ID
- 202201010645145808
- researchmap Member ID
- R000032549
Research Interests
6Research Areas
3Research History
6-
Oct, 2022 - Mar, 2023
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Apr, 2020 - Sep, 2021
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Sep, 2018 - Mar, 2020
Education
3-
Oct, 2018 - Sep, 2021
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Apr, 2013 - Mar, 2015
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Apr, 2009 - Mar, 2013
Awards
6Papers
9-
Netsu Bussei, 37(4) 127-136, Nov, 2023 Peer-reviewedLead author
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International Journal of Thermal Sciences, 193 108475-108475, Nov, 2023 Peer-reviewedLead author
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May 25, 2023<p id="p1">The elastic property of asteroids is one of the paramount parameters forunderstanding their physical nature. For example, the rigidity enablesus to discuss the asteroid’s shape and surface features such as cratersand boulders, leading to a better understanding of geomorphological andgeological features on small celestial bodies. The sound velocity allowsus to construct an equation of state that is the most fundamental stepto simulate the formation of small bodies numerically. Moreover, seismicwave velocities and attenuation factors are useful to account forresurfacing caused by impact-induced seismic shaking. The elasticproperty of asteroids thus plays an important role in elucidating theasteroid’s evolution and current geological processes. The Hayabusa2spacecraft brought back the rock samples from C-type asteroid (162173)Ryugu in December 2020. As a part of the initial analysis of returnedsamples, we measured the seismic wave velocity of the Ryugu samplesusing the pulse transmission method. We found that P- and S-wavevelocities of the Ryugu samples were about 2.1 km/s and 1.2 km/s,respectively. We also estimated Young’s modulus of 6.0 – 8.0 GPa. Acomparison of the derived parameters with those of carbonaceouschondrites showed that the Ryugu samples have a similar elastic propertyto the Tagish Lake meteorite, which may have come from a D-typeasteroid. Both Ryugu and Tagish Lake show a high degree of aqueousalteration and few high-temperature components such as chondrules,indicating that they formed in the outer region of the solar system.</p>
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Science, 379(6634), Feb 24, 2023 Peer-reviewedSamples of the carbonaceous asteroid Ryugu were brought to Earth by the Hayabusa2 spacecraft. We analyzed 17 Ryugu samples measuring 1 to 8 millimeters. Carbon dioxide–bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu’s parent asteroid formed in the outer Solar System. The samples contain low abundances of materials that formed at high temperatures, such as chondrules and calcium- and aluminum-rich inclusions. The samples are rich in phyllosilicates and carbonates, which formed through aqueous alteration reactions at low temperature, high pH, and water/rock ratios of <1 (by mass). Less altered fragments contain olivine, pyroxene, amorphous silicates, calcite, and phosphide. Numerical simulations, based on the mineralogical and physical properties of the samples, indicate that Ryugu’s parent body formed ~2 million years after the beginning of Solar System formation.
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International Journal of Thermophysics, 44(4), Feb 9, 2023 Peer-reviewedLead author
Misc.
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34(1) 24-33, 2024 InvitedLead author
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日本惑星科学会秋季講演会予稿集(Web), 2023, 2023
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日本惑星科学会秋季講演会予稿集(Web), 2023, 2023
Presentations
31-
Japan Geoscience Union (JpGU) Meeting 2024, May, 2024
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Sample Analysis Team Meeting (SATM)-4, Apr, 2024
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Hayabusa 2023 Symposium, Nov 15, 2023
Teaching Experience
1-
Oct, 2022 - Mar, 2023Physics Experiments (Rikkyo University)
Research Projects
2-
科学研究費助成事業, 日本学術振興会, Apr, 2024 - Mar, 2027
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科学研究費助成事業, 日本学術振興会, Apr, 2020 - Mar, 2022
