Explanipedia

Proposal and Application of Simplified Method for Provenance Estimation of Ancient Glass Beads Using Hyperspectral Imaging Camera Open

Yoshinari Abe, Komei Sugiura, Madoka Murakushi, Ryo Kamata, Inada Ken-ichi · 2025

The Ni isotopic composition of Ryugu reveals a common accretion region for carbonaceous chondrites Open

Fridolin Spitzer, T. Kleine, Christoph Burkhardt, Timo Hopp, Tetsuya Yokoyama , et al. · 2024

The isotopic compositions of samples returned from Cb-type asteroid Ryugu and Ivuna-type (CI) chondrites are distinct from other carbonaceous chondrites, which has led to the suggestion that Ryugu/CI chondrites formed in a different region…

Pyrrhotites in asteroid 162173 Ryugu: Records of the initial changes on their surfaces with aqueous alteration Open

Hiroharu Yui, Shu‐hei Urashima, Morihiko Onose, Mayu Morita, Shintaro Komatani , et al. · 2024

Disequilibrium oxygen isotope distribution among aqueously altered minerals in Ryugu asteroid returned samples Open

N. T. Kita, Kouki Kitajima, K. Nagashima, Noriyuki Kawasaki, Naoya Sakamoto , et al. · 2024

Oxygen 3‐isotope ratios of magnetite and carbonates in aqueously altered carbonaceous chondrites provide important clues to understanding the evolution of the fluid in the asteroidal parent bodies. We conducted oxygen 3‐isotope analyses of…

Hydrogen in magnetite from asteroid Ryugu Open

J. Aléon, S. Mostefaoui, Hélène Bureau, Divine Vangu, H. Khodja , et al. · 2024

In order to gain insights on the conditions of aqueous alteration on asteroid Ryugu and the origin of water in the outer solar system, we developed the measurement of water content in magnetite at the micrometer scale by secondary ion mass…

Analysis of Cation Composition in Dolomites on the Intact Particles Sampled from Asteroid Ryugu Open

Mayu Morita, Hiroharu Yui, Shu-hei Urashima, Morihiko Onose, Shintaro Komatani , et al. · 2023

Characterization of the elemental distribution of samples with rough surfaces has been strongly desired for the analysis of various natural and artificial materials. Particularly for pristine and rare analytes with micrometer sizes embedde…

Neodymium‐142 deficits and samarium neutron stratigraphy of C‐type asteroid (162173) Ryugu Open

Z. A. Torrano, M. K. Jordan, T. D. Mock, Richard W. Carlson, Ikshu Gautam , et al. · 2023

We report Nd and Sm isotopic compositions of four samples of Ryugu returned by the Hayabusa2 mission, including “A” (first touchdown) and “C” (second touchdown) samples, and several carbonaceous chondrites to evaluate potential genetic rel…

Nucleosynthetic s-Process Depletion in Mo from Ryugu samples returned by Hayabusa2 Open

Noriyoshi Nakanishi, Tetsuya Yokoyama, A. Ishikawa, R.J. Walker, Yoshinari Abe , et al. · 2023

Initial analyses of samples collected from two locations on the asteroid Ryugu indicated that the mineralogical, chemical, and isotopic characteristics of the Ryugu samples show similarities to carbonaceous chondrites, particularly the Ivu…

The Magnesium Isotope Composition of Samples Returned from Asteroid Ryugu Open

Martin Bizzarro, Martin Schiller, Tetsuya Yokoyama, Yoshinari Abe, J. Aléon , et al. · 2023

The nucleosynthetic isotope composition of planetary materials provides a record of the heterogeneous distribution of stardust within the early solar system. In 2020 December, the Japan Aerospace Exploration Agency Hayabusa2 spacecraft ret…

Pervasive aqueous alteration in the early Solar System revealed by potassium isotopic variations in Ryugu samples and carbonaceous chondrites Open

Yan Hu, Frédéric Moynier, Wei Dai, Marine Paquet, Tetsuya Yokoyama , et al. · 2023

Water circulation in Ryugu asteroid affected the distribution of nucleosynthetic isotope anomalies in returned sample Open

Tetsuya Yokoyama, M. Wadhwa, Tsuyoshi Iizuka, Vinai Rai, Ikshu Gautam , et al. · 2023

Studies of material returned from Cb asteroid Ryugu have revealed considerable mineralogical and chemical heterogeneity, stemming primarily from brecciation and aqueous alteration. Isotopic anomalies could have also been affected by delive…

The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with Implications for the Nature of the Parent Planetesimal Open

Haolan Tang, Edward Young, Lauren Tafla, Andreas Pack, Tommaso Di Rocco , et al. · 2023

We present oxygen isotopic analyses of fragments of the near-Earth C b -type asteroid Ryugu returned by the Hayabusa2 spacecraft that reinforce the close correspondence between Ryugu and CI chondrites. Small differences between Ryugu sampl…

Abundant presolar grains and primordial organics preserved in carbon-rich exogenous clasts in asteroid Ryugu Open

A. N. Nguyen, P. Mane, L. P. Keller, Laurette Piani, Yoshinari Abe , et al. · 2023

Preliminary analyses of asteroid Ryugu samples show kinship to aqueously altered CI (Ivuna-type) chondrites, suggesting similar origins. We report identification of C-rich, particularly primitive clasts in Ryugu samples that contain preser…

Carbonate record of temporal change in oxygen fugacity and gaseous species in asteroid Ryugu Open

Wataru Fujiya, Noriyuki Kawasaki, K. Nagashima, Naoya Sakamoto, C. M. O'd. Alexander , et al. · 2023

Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu Open

Laurette Piani, K. Nagashima, Noriyuki Kawasaki, Naoya Sakamoto, Ken‐ichi Bajo , et al. · 2023

Rock fragments of the Cb-type asteroid Ryugu returned to Earth by the JAXA Hayabusa2 mission share mineralogical, chemical, and isotopic properties with the Ivuna-type (CI) carbonaceous chondrites. Similar to CI chondrites, these fragments…

Author Correction: Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis Open

Marine Paquet, Frédéric Moynier, Tetsuya Yokoyama, Wei Dai, Yan Hu , et al. · 2023

Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2 Open

Noriyuki Kawasaki, K. Nagashima, Naoya Sakamoto, Toru Matsumoto, Ken‐ichi Bajo , et al. · 2022

The extraterrestrial materials returned from asteroid (162173) Ryugu consist predominantly of low-temperature aqueously formed secondary minerals and are chemically and mineralogically similar to CI (Ivuna-type) carbonaceous chondrites. He…

Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis Open

Marine Paquet, Frédéric Moynier, Tetsuya Yokoyama, Wei Dai, Yan Hu , et al. · 2022

Ryugu's nucleosynthetic heritage from the outskirts of the Solar System Open

Timo Hopp, Nicolas Dauphas, Yoshinari Abe, J. Aléon, C. M. O'd. Alexander , et al. · 2022

Little is known about the origin of the spectral diversity of asteroids and what it says about conditions in the protoplanetary disk. Here, we show that samples returned from Cb-type asteroid Ryugu have Fe isotopic anomalies indistinguisha…

Ryugu’s nucleosynthetic heritage from the outskirts of the Solar System Open

Timo Hopp, Nicolas Dauphas, Yoshinari Abe, J. Aléon, C. M. O'd. Alexander , et al. · 2022

Little is known about the origin of the spectral diversity of asteroids and what it says about conditions in the protoplanetary disk. Here, we show that samples returned from Cb-type asteroid Ryugu have Fe isotopic anomalies indistinguisha…

Presolar Stardust in Asteroid Ryugu Open

Jens Barosch, L. R. Nittler, Jianhua Wang, C. M. O'd. Alexander, B. T. De Gregorio , et al. · 2022

We have conducted a NanoSIMS-based search for presolar material in samples recently returned from C-type asteroid Ryugu as part of JAXA's Hayabusa2 mission. We report the detection of all major presolar grain types with O- and C-anomalous …

Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites Open

Tetsuya Yokoyama, K. Nagashima, Izumi Nakai, Edward Young, Yoshinari Abe , et al. · 2022

Carbonaceous meteorites are thought to be fragments of C-type (carbonaceous) asteroids. Samples of the C-type asteroid (162173) Ryugu were retrieved by the Hayabusa2 spacecraft. We measured the mineralogy and bulk chemical and isotopic com…

Did ancient glassware travel the Silk Road? X-ray fluorescence analysis of a Sasanian glass vessel from Okinoshima Island, Japan Open

Yoshinari Abe, Ryuji Shikaku, Madoka Murakushi, Makiko Fukushima, Izumi Nakai · 2021

The use of a portable X-ray fluorescence spectrometer revealed the provenance of a shard of a relief-cut glass bowl which was dedicated to ancient ritual on the sacred island of Okinoshima, Japan over a thousand years ago. The shard was un…

Widespread distribution of radiocesium-bearing microparticles over the greater Kanto Region resulting from the Fukushima nuclear accident Open

Yoshinari Abe, Seika Onozaki, Izumi Nakai, Kouji Adachi, Yasuhito Igarashi , et al. · 2021

The Fukushima Daiichi Nuclear Power Plant (FDNPP) accident in March 2011 emitted a considerable amount of radioactive materials. This study isolated radiocesium-bearing microparticles (CsMPs), a form of radioactive materials emitted from t…

Proposal of a Compositional Characterization Method by Semi-quantitative Analysis of XRF Spectrum of Pigments in Mural Painting and Its Application to Nondestructive On-site Analysis of the Murals of the Tomb of Khonsuemheb in Egypt Open

Yoshinari Abe, Eri OGIDANI, Haruka Hidaka, Haruka Ebisawa, Izumi Nakai , et al. · 2020

To investigate the chemical compositional features of pigments used in archaeological mural paintings and paintings of art, this paper proposes a semi-quantitative analytical method involving the X-ray fluorescence spectrum obtained by non…

Erratum: Brain structural covariance networks in obsessive-compulsive disorder: A graph analysis from the ENIGMA Consortium (Brain (2020) 143 (684-700) DOI: 10.1093/brain/awaa001) Open

Je‐Yeon Yun, Premika S.W. Boedhoe, Chris Vriend, Neda Jahanshad, Yoshinari Abe , et al. · 2020

The authors apologize for misspelling the first name of the author Erika L. Nurmi. This has now been corrected.

Investigation of Physical and Chemical Characteristics of Radioactive Aerosols Emitted From Reactor Unit 1 by Fukushima Daiichi Nuclear Power Plant Accident Open

Seika Onozaki, Yoshinari Abe, Izumi Nakai, Kouji Adachi, Yasuhito Igarashi , et al. · 2019

Three radioactive microparticles were separated from particles on filter tape samples collected hourly at a suspended particulate matter (SPM) monitoring site located at ∼25 km north of the Fukushima Daiichi Nuclear Power Plant (FDNPP), af…

Announcements Open

Yoshinori Iiguni, Reo Tamura, Shinya Kitagawa, Hajime Ohtani, Taichi Nakagawa , et al. · 2019

Development of a Portable Ultraviolet-visible Absorption/Fluorescence Spectrometer and Its Application to Nondestructive On-site Analysis of Original Drawings by Katsushika Hokusai Open

Saki AKAGI, Yoshinari Abe, Arisa IZUMI, Airi Hirayama, Madoka MURAKUSHI , et al. · 2019

A portable spectrometer capable of measuring both an ultraviolet-visible absorption (UV-vis) and a fluorescence emission spectrum was developed with the aim of nondestructive onsite analysis of be the cultural heritage and artwork. To demo…

Trace-element Analysis of Volcanic Glass Shards by Laser Ablation ICP-MS for Forensic Soil Analysis Open

Teppei Nogami, Yoshinari Abe, Izumi Nakai · 2018

The purpose of the present study is to develop a new method for forensic soil analysis by focusing trace element composition of volcanic glass in a soil determined by LA-ICP-MS. First, we have established the LA-ICP-MS analysis of trace-el…

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