Explanipedia

High Resolution Spectroscopy of Comet C/2023 A3 (Tsuchinshan–ATLAS): insight into Sodium, Potassium and Lithium abundances Open

Giovanni Munaretto, G. Cremonese, Pamela Cambianica, R. Brunetto, J. Aléon , et al. · 2025

IntroductionComet C/2023 A3 (Tsuchinshan-ATLAS) is a dynamically new Oort Cloud comet discovered by The Asteroid Terrestrial impact Last Alert System (ATLAS) on February 2023. A high-resolution (R=130000) spectrum of C/2023 A3 taken with t…

Mid‐infrared detection and characterization of refractory inclusions in CM and CO chondrites: A non‐destructive approach for returned space samples Open

Jean‐Christophe Charlier, Alice Aléon‐Toppani, R. Brunetto, J. Aléon, Ferenc Borondics · 2025

Refractory inclusions (RIs) in chondrites are widely used as tracers of early solar system formation conditions. In the context of sample‐return missions, a non‐destructive and non‐invasive analytical tool that can rapidly detect and chara…

Growth mechanism of chromia scales on a model Ni-30Cr alloy at high temperatures Open

Xian Huang, Sophie Bosonnet, Paul Fossati, L. Latu‐Romain, Y. Wouters , et al. · 2024

International audience

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…

Analogues of enigmatic L-types: The effect of space weathering on CV, CO, CK, and CL chondrites Open

Max Mahlke, Alice Aléon‐Toppani, C. Lantz, Pierre Beck, L. Bonal , et al. · 2024

L-type asteroids are rare asteroids located throughout the Main Belt. They are unique among the minor bodies as their spectral appearance in the visible-near-infrared (VisNIR) is thought to be dominated by calcium–aluminium-rich incl…

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…

The CNME Project, a National Curation Center for Extraterrestrial Samples in France Open

J. Duprat, J-C. Viennet, Mathieu Roskosz, M. Morand, Silvia Boccato , et al. · 2024

International audience

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…

Growth Mechanism of Chromia Scales on a Model Ni-30cr Alloy at High Temperatures Open

Xian Huang, Sophie Bosonnet, Paul Fossati, L. Latu‐Romain, Y. Wouters , et al. · 2024

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…

Datafiles for Hydrogen in magnetite from asteroid Ryugu Open

J. Aléon, Hélène Bureau · 2023

Datafiles for Hydrogen in magnetite from asteroid Ryugu Open

J. Aléon, Hélène Bureau · 2023

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

Curation of Extraterrestrial samples in France and the future center for extraterrestrial materials in Paris Open

J. Duprat, Jean‐Christophe Viennet, M. Roskosz, B. Doisneau, Sylvain Pont , et al. · 2023

International audience

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…

Three‐dimensional multiscale assembly of phyllosilicates, organics, and carbonates in small Ryugu fragments Open

Z. Dionnet, Stefano Rubino, Alice Aléon‐Toppani, R. Brunetto, A. Tsuchiyama , et al. · 2023

We report μm‐scale nondestructive infrared (IR) hyperspectral results (IR computed tomography, IR‐CT) in 3‐D and IR surface imaging, IR‐S) in 2‐D, at SOLEIL) combined with X‐ray nano‐computed tomography analyses (at SPring‐8) performed on …

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…

The Solar System calcium isotopic composition inferred from Ryugu samples Open

Frédéric Moynier, Wei Dai, Tetsuya Yokoyama, Y. Hu, M. Paquet , et al. · 2022

CO CV CM CI Ryugu A Ryugu C 0.0 0.5 1.0 1.5 44/40CaSRM915a (age corrected) The Hayabusa2 spacecraft has returned samples from the Cb-type asteroid (162173) Ryugu to Earth. Previous petrological and chemical analyses support a close link be…

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