The University of Tokyo · 물리·천문학
유이치로 초 교수의 연구실은 태양계 천체의 표면 및 내부 구조를 이해하기 위해 행성 표면 분석, 미세입자 및 샘플 분석, 그리고 탐사 미션을 위한 고감도 분광 측정 기술을 핵심으로 합니다. 주로 화성의 위성 '포브스'와 소행성 '리유구'의 표면 미네랄 조성과 연대 측정을 위해 현장에서의 라만 스펙트로스코피 및 K-Ar 동위원소 분석 기법을 개발하고 있으며, 우주 탐사 미션(MMX, 하야부사2 등)의 과학적 성과를 극대화하는 데 기여하고 있습니다. 특히, 우주에서의 고정밀 분석 기술과 샘플의 지표와의 비교 분석이 핵심 연구 과제입니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Abstract Mineralogy is the key to understanding the origin of Phobos and its position in the evolution of the Solar System. In situ Raman spectroscopy on Phobos is an important tool to achieve the scientific objectives of the Martian Moons eXploration (MMX) mission, and maximize the scientific merit of the sample return by characterizing the mineral composition and heterogeneity of the surface of Phobos. Conducting in situ Raman spectroscopy in the harsh environment of Phobos requires a very sen
The crater retention ages of the mare deposits within the Orientale multi‐ring impact basin are investigated using 10‐m resolution images obtained by the SELENE (Kaguya) spacecraft, in order to constrain the volcanic history of the Moon around the nearside‐farside boundary. Precise crater‐counting analyses reveal that mare deposits in the Orientale region are much younger than previously estimated: ∼2.9 Ga mare basalt in the eastern part of Mare Orientale and ∼1.8–2.2 Ga mare deposits in Lacus V
Abstract Crater morphology and surface age of asteroid (162173) Ryugu are characterized using the high‐resolution images obtained by the Hayabusa2 spacecraft. Our observations reveal that the abundant boulders on and under the surface of the rubble‐pile asteroid affect crater morphology. Most of the craters on Ryugu exhibit well‐defined circular depressions, unlike those observed on asteroid Itokawa. The craters are typically outlined by boulders remaining on the rim. Large craters (diameter >
Our experimental results demonstrate that accurate and precise measurements are possible using the KArLE approach on basaltic rocks, which are ubiquitous on planetary surfaces, and are useful in addressing a wide range of questions in planetary science.
In situ radiogenic isotope measurements to obtain the absolute age of geologic events on planets are of great scientific value. In particular, K-Ar isochrons are useful because of their relatively high technical readiness and high accuracy. Because this isochron method involves spot-by-spot K measurements using laser-induced breakdown spectroscopy (LIBS) and simultaneous Ar measurements with mass spectrometry, LIBS measurements are conducted under a high vacuum condition in which emission intens
Hayabusa2 collected 5.4 g of samples from asteroid (162173) Ryugu and brought them back to Earth. Obtaining multiband images of these samples with spectral bands comparable to those used for remote-sensing observations is important for characterizing the collected samples and examining how representative they are compared with spacecraft observations of Ryugu. In this study, we constructed a multiband microscopic camera system that enables both visual multispectral imaging at 390 (ul), 475 (b),
