Bibliografie tematiche / Asteroid Ryugu

Letteratura scientifica selezionata sul tema "Asteroid Ryugu"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Asteroid Ryugu":

Ota, Tsutomu, Christian Potiszil, Katsura Kobayashi, Ryoji Tanaka, Hiroshi Kitagawa, Tak Kunihiro, Chie Sakaguchi, Masahiro Yamanaka e Eizo Nakamura. "The Formation of a Rubble Pile Asteroid: Insights from the Asteroid Ryugu". Universe 9, n. 6 (16 giugno 2023): 293. http://dx.doi.org/10.3390/universe9060293.

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The Hayabusa2 mission returned primitive samples from the C-type asteroid Ryugu to Earth. The C-type asteroids hold clues to the origin of Earth’s water and the building blocks of life. The rubble pile structure of C-type asteroids is a crucial physical feature relating to their origin and evolution. A rubble pile asteroid is hypothesized to be bound primarily by self-gravity with a significant void space among irregularly shaped materials after catastrophic impacts between larger asteroids. However, the geological observations from Hayabusa2 and the analyses of the returned sample from Ryugu revealed that the high microporosity was common to various >10 m- to mm-sized materials of Ryugu, which suggests that the asteroid Ryugu is not just a loosely bound agglomeration of massive rocky debris from shattered asteroids. For a better understanding of the origin and evolution of the rubble pile asteroid, the current most accepted hypothesis should be verified by observations and laboratory analyses and improved upon based on this information. Here, the previous models are examined using Hayabusa2’s geological observations of the asteroid and the analytical data from the samples returned from Ryugu’s surface and subsurface material. Incorporating the new findings, a hypothesis for the evolution of the rubble pile asteroid Ryugu from a cometary nucleus through sublimation and subsequent dynamic resurfacing is proposed. The proposed hypothesis is applicable to other rubble-pile asteroids and would provide perspectives for near-Earth objects in general.

Miura, Hitoshi, Eizo Nakamura e Tak Kunihiro. "The Asteroid 162173 Ryugu: a Cometary Origin". Astrophysical Journal Letters 925, n. 2 (31 gennaio 2022): L15. http://dx.doi.org/10.3847/2041-8213/ac4bd5.

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Abstract The Japanese Hayabusa2 mission has revealed in detail the physical characteristics of the C-type asteroid 162173 Ryugu, in particular, its spinning top-shaped rubble-pile structure and potentially high organic content. A widely accepted formation scenario for Ryugu is catastrophic collision between larger asteroids and the subsequent slow gravitational accumulation of collisional debris. An alternative scenario is that Ryugu is an extinct comet that lost its icy components. Here, we numerically simulated the sublimation of water ice from a porous cometary nucleus until the refractory components, such as silicate rocks and organic matter, were left behind as evaporative residues. Such a process represents the transformation from a comet to an asteroid. The spin-up related to the shrinking nucleus, associated with water ice sublimation, was also calculated. The result of the calculation indicates that the cometary origin scenario can account for all the features of Ryugu discussed above. We conclude that organic-rich spinning top-shaped rubble-pile asteroids, such as Ryugu, are comet–asteroid transition objects or extinct comets.

Brunetto, R., C. Lantz, Y. Fukuda, A. Aléon-Toppani, T. Nakamura, Z. Dionnet, D. Baklouti et al. "Ryugu’s Anhydrous Ingredients and Their Spectral Link to Primitive Dust from the Outer Solar System". Astrophysical Journal Letters 951, n. 2 (1 luglio 2023): L33. http://dx.doi.org/10.3847/2041-8213/acdf5c.

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Abstract Ryugu is a second-generation C-type asteroid formed by the reassembly of fragments of a previous larger body in the main asteroid belt. While the majority of Ryugu samples returned by Hayabusa2 are composed of a lithology dominated by aqueously altered minerals, clasts of pristine olivine and pyroxene remain in the least-altered lithologies. These clasts are objects of great interest for revealing the composition of the dust from which the original building blocks of Ryugu's parent asteroid formed. Here we show that some grains rich in olivine, pyroxene, and amorphous silicates discovered in one millimeter-sized stone of Ryugu have infrared spectra similar to the D-type asteroid Hektor (a Jupiter Trojan), to comet Hale–Bopp, and to some anhydrous interplanetary dust particles of probable cometary origin. This result indicates that Ryugu's primary parent body incorporated anhydrous ingredients similar to the building blocks of asteroids (and possibly some comets) formed in the outer solar system, and that Ryugu retained valuable information on the formation and evolution of planetesimals at different epochs of our solar system's history.

Yada, Toru, Masanao Abe, Tatsuaki Okada, Aiko Nakato, Kasumi Yogata, Akiko Miyazaki, Kentaro Hatakeda et al. "Preliminary analysis of the Hayabusa2 samples returned from C-type asteroid Ryugu". Nature Astronomy 6, n. 2 (20 dicembre 2021): 214–20. http://dx.doi.org/10.1038/s41550-021-01550-6.

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AbstractC-type asteroids1 are considered to be primitive small Solar System bodies enriched in water and organics, providing clues to the origin and evolution of the Solar System and the building blocks of life. C-type asteroid 162173 Ryugu has been characterized by remote sensing2–7 and on-asteroid measurements8,9 with Hayabusa2 (ref. 10). However, the ground truth provided by laboratory analysis of returned samples is invaluable to determine the fine properties of asteroids and other planetary bodies. We report preliminary results of analyses on returned samples from Ryugu of the particle size distribution, density and porosity, spectral properties and textural properties, and the results of a search for Ca–Al-rich inclusions (CAIs) and chondrules. The bulk sample mainly consists of rugged and smooth particles of millimetre to submillimetre size, confirming that the physical and chemical properties were not altered during the return from the asteroid. The power index of its size distribution is shallower than that of the surface boulder observed on Ryugu11, indicating differences in the returned Ryugu samples. The average of the estimated bulk densities of Ryugu sample particles is 1,282 ± 231 kg m−3, which is lower than that of meteorites12, suggesting a high microporosity down to the millimetre scale, extending centimetre-scale estimates from thermal measurements5,9. The extremely dark optical to near-infrared reflectance and spectral profile with weak absorptions at 2.7 and 3.4 μm imply a carbonaceous composition with indigenous aqueous alteration, matching the global average of Ryugu3,4 and confirming that the sample is representative of the asteroid. Together with the absence of submillimetre CAIs and chondrules, these features indicate that Ryugu is most similar to CI chondrites but has lower albedo, higher porosity and more fragile characteristics.

Herd, Christopher D. K. "Analyzing asteroid Ryugu". Science 379, n. 6634 (24 febbraio 2023): 784–85. http://dx.doi.org/10.1126/science.ade4188.

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Tachibana, Shogo, e Nami Sakai. "Asteroidal Organics from the Sample Return Mission Hayabusa2 and their Implication for Understanding our Origins". Elements 20, n. 1 (1 febbraio 2024): 31–37. http://dx.doi.org/10.2138/gselements.20.1.31.

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The C-type asteroid Ryugu samples returned by the Hayabusa2 spacecraft are the chemically most pristine material in the Solar System, as they have not been exposed to terrestrial environments. The organic matter in Ryugu records the molecular evolution from the Sun’s parent molecular cloud chemistry to asteroidal aqueous alteration. In this article, we review the results of Ryugu sample analysis and discuss the evolution of organic matter in the early Solar System by comparing these results with recent radio and infrared observations of protostars and protoplanetary disks.

Barosch, Jens, Larry R. Nittler, Jianhua Wang, Conel M. O’D. Alexander, Bradley T. De Gregorio, Cécile Engrand, Yoko Kebukawa et al. "Presolar Stardust in Asteroid Ryugu". Astrophysical Journal Letters 935, n. 1 (1 agosto 2022): L3. http://dx.doi.org/10.3847/2041-8213/ac83bd.

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Abstract 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 isotopic compositions typically identified in carbonaceous chondrite meteorites: 1 silicate, 1 oxide, 1 O-anomalous supernova grain of ambiguous phase, 38 SiC, and 16 carbonaceous grains. At least two of the carbonaceous grains are presolar graphites, whereas several grains with moderate C isotopic anomalies are probably organics. The presolar silicate was located in a clast with a less altered lithology than the typical extensively aqueously altered Ryugu matrix. The matrix-normalized presolar grain abundances in Ryugu are 4.8 − 2.6 + 4.7 ppm for O-anomalous grains, 25 − 5 + 6 ppm for SiC grains, and 11 − 3 + 5 ppm for carbonaceous grains. Ryugu is isotopically and petrologically similar to carbonaceous Ivuna-type (CI) chondrites. To compare the in situ presolar grain abundances of Ryugu with CI chondrites, we also mapped Ivuna and Orgueil samples and found a total of 15 SiC grains and 6 carbonaceous grains. No O-anomalous grains were detected. The matrix-normalized presolar grain abundances in the CI chondrites are similar to those in Ryugu: 23 − 6 + 7 ppm SiC and 9.0 − 3.6 + 5.4 ppm carbonaceous grains. Thus, our results provide further evidence in support of the Ryugu–CI connection. They also reveal intriguing hints of small-scale heterogeneities in the Ryugu samples, such as locally distinct degrees of alteration that allowed the preservation of delicate presolar material.

Bizzarro, Martin, Martin Schiller, Tetsuya Yokoyama, Yoshinari Abe, Jérôme Aléon, Conel M. O’D Alexander, Sachiko Amari et al. "The Magnesium Isotope Composition of Samples Returned from Asteroid Ryugu". Astrophysical Journal Letters 958, n. 2 (24 novembre 2023): L25. http://dx.doi.org/10.3847/2041-8213/ad09d9.

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Abstract 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 returned to Earth the first samples of a primitive asteroid, namely, the Cb-type asteroid Ryugu. This provides a unique opportunity to explore the kinship between primitive asteroids and carbonaceous chondrites. We report high-precision μ 26Mg* and μ 25Mg values of Ryugu samples together with those of CI, CM, CV, and ungrouped carbonaceous chondrites. The stable Mg isotope composition of Ryugu aliquots defines μ 25Mg values ranging from –160 ± 20 ppm to –272 ± 30 ppm, which extends to lighter compositions relative to Ivuna-type (CI) and other carbonaceous chondrite groups. We interpret the μ 25Mg variability as reflecting heterogeneous sampling of a carbonate phase hosting isotopically light Mg (μ 25Mg ∼ –1400 ppm) formed by low temperature equilibrium processes. After correcting for this effect, Ryugu samples return homogeneous μ 26Mg* values corresponding to a weighted mean of 7.1 ± 0.8 ppm. Thus, Ryugu defines a μ 26Mg* excess relative to the CI and CR chondrite reservoirs corresponding to 3.8 ± 1.1 and 11.9 ± 0.8 ppm, respectively. These variations cannot be accounted for by in situ decay of 26Al given their respective 27Al/24Mg ratios. Instead, it requires that Ryugu and the CI and CR parent bodies formed from material with a different initial 26Al/27Al ratio or that they are sourced from material with distinct Mg isotope compositions. Thus, our new Mg isotope data challenge the notion that Ryugu and CI chondrites share a common nucleosynthetic heritage.

Tanaka, Ryoji, Dilan M. Ratnayake, Tsutomu Ota, Noah Miklusicak, Tak Kunihiro, Christian Potiszil, Chie Sakaguchi et al. "Unraveling the Cr Isotopes of Ryugu: An Accurate Aqueous Alteration Age and the Least Thermally Processed Solar System Material". Astrophysical Journal 965, n. 1 (1 aprile 2024): 52. http://dx.doi.org/10.3847/1538-4357/ad276a.

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Abstract The analysis of samples returned from the C-type asteroid Ryugu has drastically advanced our knowledge of the evolution of early solar system materials. However, no consensus has been obtained on the chronological data, which is important for understanding the evolution of the asteroid Ryugu. Here, the aqueous alteration age of Ryugu particles was determined by the Mn–Cr method using bulk samples, yielding an age of 4.13 + 0.62/−0.55 Myr after the formation of Ca–Al-rich inclusions (CAI). The age corresponds to 4563.17 + 0.60/−0.67 Myr ago. The higher 55Mn/52Cr, ε 54Cr, and initial ε 53Cr values of the Ryugu samples relative to any carbonaceous chondrite samples implies that its progenitor body formed from the least thermally processed precursors in the outermost region of the protoplanetary disk. Despite accreting at different distances from the Sun, the hydrous asteroids (Ryugu and the parent bodies of CI, CM, CR, and ungrouped C2 meteorites) underwent aqueous alteration during a period of limited duration (3.8 ± 1.8 Myr after CAI). These ages are identical to the crystallization age of the carbonaceous achondirtes NWA 6704/6693 within the error. The ε 54Cr and initial ε 53Cr values of Ryugu and NWA 6704/6693 are also identical, while they show distinct Δ'17O values. This suggests that the precursors that formed the progenitor bodies of Ryugu and NWA 6703/6693 were formed in close proximity and experienced a similar degree of thermal processing in the protosolar nebula. However, the progenitor body of Ryugu was formed by a higher ice/dust ratio, than NWA6703/6693, in the outer region of the protoplanetary disk.

Praet, A., M. A. Barucci, P. H. Hasselmann, K. Kitazato, T. Iwata, M. Matsuoka, D. Domingue e B. E. Clark. "Hydrogen abundance estimation model and application to (162173) Ryugu". Astronomy & Astrophysics 649 (maggio 2021): L16. http://dx.doi.org/10.1051/0004-6361/202140900.

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Context. The JAXA asteroid sample return mission Hayabusa2 acquired a huge quantity of data from the asteroid (162173) Ryugu during its 1.5 years in asteroid proximity orbit. On December 5, 2020 (Japan time), Hayabusa brought back to Earth a 5.4 g sample from Ryugu’s surface. Aims. We analyzed the near-infrared spectra of Ryugu, in particular the band at 2.72 μm, with the aim to investigate the hydrogen content of the H2O and OH− groups in hydrated phyllosilicates on Ryugu’s surface. Aims. We applied two different methods, normalized optical path length (NOPL) and effective single-particle absorption thickness (ESPAT), to the 3 μm region absorption band, and we compared the obtained spectral parameters with those obtained from carbonaceous chondrite meteorites whose H content was determined in the laboratory. Methods. We derived an exponential correlation between the selected meteorite H content and its respective ESPAT and NOPL parameters. The average value of the H content obtained on Ryugu’s surface with its relative variations, combining the results obtained with the two methods, is 0.52−0.21+0.16 wt.%. These methods can be applied to other asteroids that exhibit a 3 μm region absorption band to estimate the mean average of H content. Results. The results of the ESPAT and NOPL methods used on the Ryugu spectral data present small variations across Ryugu’s surface and do not show any evident relation with the surface geomorphological structures. Our estimation of the global average H content of Ryugu is in agreement with those of several aqueously altered carbonaceous chondrites measured in the laboratory and is most similar to the H content of heated CM. The study of phyllosilicate H2O and OH− group hydrogen content on Ryugu and the derived method may be applied to other observed primitive asteroids. The obtained results will allow Solar System evolution models to be constrained and will allow the formation and evolution of the Solar System to be better understood.

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Tesi sul tema "Asteroid Ryugu":

Hamm, Maximilian [Verfasser]. "Modeling and Interpretation of In-Situ Radiometric Flux Measurements on the Surface of Asteroid (162173) Ryugu / Maximilian Hamm". Berlin : Freie Universität Berlin, 2019. http://d-nb.info/1202041051/34.

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Le, Pivert-Jolivet Tania. "Composition, origine et évolution de Ryugu à travers les analyses de MicrOmega/Curation". Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPASP192.

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Les astéroïdes primitifs sont des petits corps qui ont relativement peu évolué depuis leur formation. Ils nous renseignent sur la composition chimique du système solaire primitif et son évolution jusqu’à aujourd’hui. Avant les années 2020, les seuls potentiels analogues de ces objets dont nous disposions pour des analyses en laboratoire étaient les chondrites carbonées (CCs). Mais le lien entre les CCs et leurs corps parents astéroïdaux n'est pas encore clair, et la composition primitive des CCs est partiellement altérée par l’interaction avec l’atmosphère terrestre. C’est pourquoi dans les années 2010, deux missions spatiales ont observé et collecté des échantillons de la surface d’astéroïdes primitifs : ils représentent la première analyse en laboratoire de fragments représentatifs de leur corps parents. L’astéroïde géocroiseur de type C, (162173) Ryugu, a été la cible de la mission Hayabusa2 (JAXA). La sonde a réalisé deux collectes, prélevant des échantillons de la surface et de la sous-surface excavée par un impacteur artificiel. En décembre 2020, la capsule scellée contenant 5.4 g d’échantillons est revenue sur Terre et a été ouverte dans la Curation Facility (Sagamihara, Japon), un complexe contenant un ensemble d’enceintes propres pour réaliser une première analyse des grains, sans les exposer à l’atmosphère et en préservant leur intégrité. L’objectif de ma thèse a été de caractériser la composition des grains de Ryugu pour retracer l’évolution de la matière primitive à différentes étapes de l’histoire du système solaire. Pour cela, j’ai analysé les données acquises par MicrOmega, un imageur hyperspectral proche infrarouge (0.99 – 3.65 μm) installé dans la Curation Facility. MicrOmega permet une analyse de la composition minérale et organique des grains de manière non invasive. J’ai étudié la bande d’absorption à 2.7 μm, caractéristique de la vibration du groupe -OH dans les phyllosilicates des grains. J’ai réalisé une étude statistique sur les variations de position et de profondeur de la bande entre plusieurs centaines de grains millimétriques, qui témoignent une variation de composition des phyllosilicates. Cette analyse suggère qu’une partie des grains du site de collecte de surface ont été exposés à l’altération spatiale, un processus affectant la composition et la microstructure de la surface des corps sans atmosphères. À l’inverse, la totalité des grains provenant de la sous-surface ont subi une très faible exposition à l’environnement spatial. Cette étude montre aussi que les échantillons de Ryugu sont très appauvris en eau (H₂O) par rapport aux chondrites CI malgré leur minéralogie proche, et suggère qu’une partie importante de l’eau des CI pourrait être d’origine terrestre. J’ai ensuite étudié les variations de la forme et de la position de la bande à 2.7 μm à la surface des grains. J’ai montré que l'hétérogénéité spectrale de la surface varie d'un grain à l'autre. Cette variation d'hétérogénéité pourrait être liée à des variations du degré d'altération aqueuse et/ou du degré d'altération spatiale sur des surfaces avec différentes rugosités. Cette étude montre le potentiel de l’imagerie hyperspectrale infrarouge pour détecter des variations dans le contenu en eau entre différents grains, sans biais par l’atmosphère terrestre. Ces travaux apportent une meilleure compréhension de l’évolution physique et chimique de la surface et de la sous-surface proche des astéroïdes primitifs. Ils apportent aussi de nouveaux éléments sur l’altération terrestre des chondrites carbonées, avec une implication sur la quantité d’eau dans les corps parents astéroïdaux des chondrites CI
Primitive asteroids are small bodies that have evolved relatively little since their formation. They contain information about the chemical composition of the early solar system and its evolution up to the present day. Before the 2020s, the only potential analogs of these objects available for laboratory analysis were carbonaceous chondrites (CCs). But the link between CCs and their asteroidal parent bodies is not yet clear, and the primitive composition of CCs is partially altered by interaction with the terrestrial atmosphere. This is why, in the 2010s, two space missions observed and collected samples from the surface of primitive asteroids: they represent the first laboratory study of fragments representing their parent bodies. The C-type near-Earth asteroid (162173) Ryugu, was the target of the Hayabusa2 mission (JAXA). The spacecraft performed two samplings, collecting surface and subsurface samples excavated by an artificial impactor. In December 2020, the sealed capsule containing 5.4g of samples returned to Earth and was opened in the Curation Facility (Sagamihara, Japan), a complex containing a set of clean chambers for carrying out an initial analysis of the grains, preserving their integrity and without exposing them to the terrestrial atmosphere. The aim of my thesis was to characterize the composition of Ryugu samples to retrace the evolution of the primitive matter at different stages in the history of the solar system. Thus, I analysed data acquired by the near-infrared (0.99 – 3.65 μm) hyperspectral microscope MicrOmega, installed in the Curation Facility. MicrOmega enables a non-invasive characterization of the mineral and organic composition of the grains. I studied the 2.7 μm band, characteristic of the vibration of the -OH group in the phyllosilicates of the samples. I carried out a statistical study of the variations in the position and depth of the band between several hundred millimetre-sized grains, which indicate a variation in the composition of the phyllosilicates. This analysis suggests that some of the grains collected at the surface experienced space weathering, a process that affects the composition and microstructure of the surface of airless bodies. Conversely, all the grains from the subsurface have undergone a limited exposure to the space environment. This study also shows that the Ryugu samples are depleted in water (H₂O) compared with CI chondrites, despite their similar mineralogy, and suggests that a significant proportion of the water in the CIs could be of terrestrial origin. I then studied the variations in the shape and position of the 2.7 μm band at the surface of the grains. I showed that the spectral heterogeneity of the surface varies from one grain to another. This variation in heterogeneity could be linked to variations in the degree of aqueous alteration and/or the degree of space weathering on surfaces with different roughnesses. This study shows the potential of infrared hyperspectral imaging to detect variations in the water content between the grains, without any bias by the terrestrial atmosphere. This work provides a better understanding of the physical and chemical evolution of the surface and the near subsurface of primitive asteroids. It also provides new insights on the terrestrial alteration of carbonaceous chondrites, with implications for the quantity of water in the asteroidal parent bodies of CI chondrites

Libri sul tema "Asteroid Ryugu":

Russell, C. T., e Ayako Matsuoka. Hayabusa2: Revealing the Evolution of C-Type Asteroid Ryugu. Springer, 2019.

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Russell, C. T., e Ayako Matsuoka. Hayabusa2: Revealing the Evolution of C-Type Asteroid Ryugu. Springer, 2018.

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Capitoli di libri sul tema "Asteroid Ryugu":

Levasseur-Regourd, Anny-Chantal. "Ryugu Asteroid". In Encyclopedia of Astrobiology, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-642-27833-4_5563-1.

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Levasseur-Regourd, Anny-Chantal. "Ryugu Asteroid". In Encyclopedia of Astrobiology, 2704–5. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65093-6_5563.

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Okada, Tatsuaki, Tetsuya Fukuhara, Satoshi Tanaka, Makoto Taguchi, Takeshi Imamura, Takehiko Arai, Hiroki Senshu et al. "Thermal Infrared Imaging Experiments of C-Type Asteroid 162173 Ryugu on Hayabusa2". In Hayabusa2, 255–86. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-024-1538-4_15.

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Tachibana, Shogo. "Mineralogy of Returned Sample from C-Type Near-Earth Asteroid (162173) Ryugu". In Celebrating the International Year of Mineralogy, 265–86. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-28805-0_11.

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Matsuoka, A., e C. T. Russell. "Editorial to Topical Volume on: Hayabusa2: Revealing the Evolution of C-Type Asteroid Ryugu". In Hayabusa2, 1–2. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1538-4_1.

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Takita, Jun, Hiroki Senshu e Satoshi Tanaka. "Feasibility and Accuracy of Thermophysical Estimation of Asteroid 162173 Ryugu (1999 JU3) from the Hayabusa2 Thermal Infrared Imager". In Hayabusa2, 287–315. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1538-4_16.

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Okazaki, Ryuji, Hirotaka Sawada, Shinji Yamanouchi, Shogo Tachibana, Yayoi N. Miura, Kanako Sakamoto, Yoshinori Takano et al. "Hayabusa2 Sample Catcher and Container: Metal-Seal System for Vacuum Encapsulation of Returned Samples with Volatiles and Organic Compounds Recovered from C-Type Asteroid Ryugu". In Hayabusa2, 107–24. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-024-1538-4_8.

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Ishibashi, K., K. Shirai, K. Ogawa, K. Wada, R. Honda, M. Arakawa, N. Sakatani e Y. Ikeda. "Performance of Hayabusa2 DCAM3-D Camera for Short-Range Imaging of SCI and Ejecta Curtain Generated from the Artificial Impact Crater Formed on Asteroid 162137 Ryugu (1999 JU3$\mbox{JU}_{3}$)". In Hayabusa2, 213–38. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-024-1538-4_13.

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Ono, Go, Naoko Ogawa, Hiroshi Takeuchi, Hitoshi Ikeda, Yuto Takei, Fuyuto Terui, Yuya Mimasu, Kent Yoshikawa, Takanao Saiki e Yuichi Tsuda. "Controlled descent of Hayabusa2 to Ryugu". In Hayabusa2 Asteroid Sample Return Mission, 177–87. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-323-99731-7.00009-x.

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Yoshikawa, Kent, Hirotaka Sawada, Shota Kikuchi, Yuya Mimasu, Naoko Ogawa, Go Ono, Fuyuto Terui, Yuto Takei, Takanao Saiki e Yuichi Tsuda. "Touchdown and sampling from asteroid Ryugu". In Hayabusa2 Asteroid Sample Return Mission, 359–86. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-323-99731-7.00018-0.

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Atti di convegni sul tema "Asteroid Ryugu":

Barosch, Jens, e Larry Nittler. "Presolar Grains in Asteroid Ryugu". In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.11490.

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Okada, T. "Thermography of Asteroid Ryugu by Hayabusa2". In 2019 Quantitative InfraRed Thermographapy Asia. QIRT Council, 2019. http://dx.doi.org/10.21611/qirt.2019.008.

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Yurimoto, Hisayoshi, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hikaru Yabuta, Hiroshi Naraoka, Shogo Tachibana, Sei-ichiro Watanabe e Yuichi Tsuda. "Geochemistry and Cosmochemistry of Asteroid Ryugu Samples". In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.10715.

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Nittler, Larry, Jens Barosch, Bradley De Gregorio e Rhonda Stroud. "Nanosims Analysis of Organic Matter in Asteroid Ryugu". In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.11112.

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Graninger, Dawn, Angela M. Stickle, J. Michael Owen e Megan Syal. "Simulating Hypervelocity Impacts into Rubble Pile Structuresfor Planetary Defense". In 2022 16th Hypervelocity Impact Symposium. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/hvis2022-19.

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Abstract (sommario):

The Double Asteroid Redirection Test (DART) Mission, NASA’s first planetary defense mission, will be the first fullscale test of a kinetic impactor. In this test, DART will impact into Dimorphos, the secondary of the binary asteroid Didymos, and change its orbit around the primary (Cheng et al. 2018, Rivkin et al. 2021). In preparation for the late September 2022 impact, it is necessary to understand how different aspects of asteroid properties can affect the outcome of the DART impact and quantify those effects. The asteroid rendezvous missions, Hayabusa, Hayabusa2, and Osiris-REx, have given us an unprecedented look at near-Earth asteroids and the diversity of environments that exist on these bodies. Specifically, from the Hayabusa2 and Osiris-REx missions to Ryugu and Bennu, we have seen that some near-Earth asteroids lack significant areas of smooth fine-grained regolith, and are instead are characterized as rubble pile structures made up of larger boulders held together. We know that the deflection efficiency of a kinetic impactor is influenced by the target properties, such as material strength and porosity, with impacts into weaker targets having larger deflection efficiencies. While the prevalence of these rubble pile structures in the broader near-Earth asteroid population is unknown, they could exhibit large variations in material strength on a single body (e.g. very weak regolith and strong boulders). Characterizing how these unique topographies with varying material properties could influence a kinetic impactor deflection is necessary to ensure success in a planetary defense scenario.

Hu, Michael, Barbara Lavina, Ercan Alp, Jiyong Zhao, Mathieu Roskosz, Pierre Beck, Jean-Christophe Viennet et al. "Elastic and thermodynamic properties of asteroid Ryugu return samples". In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.9527.

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Yap, Teng ee, William Herbst e James P. Greenwood. "ASTEROID MACROPOROSITY AS A CONSTRAINT ON METEORITIC ANALOGS: MODELING RYUGU". In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-356181.

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Fehr, Manuela, Maria Schönbächler e Tetsuya Yokoyama. "Zirconium isotope composition of samples returned from the asteroid Ryugu". In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.18093.

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Stroud, Rhonda, Bradley De Gregorio, Larry Nittler, Katherine Burgess, Brittany Cymes, Jens Barosch, Hikaru Yabuta e Takaaki Noguchi. "Electron Microscopy of Organic Matter in Returned Samples from Asteroid Ryugu". In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.11600.

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Yabuta, Hikaru, Hiroshi Naraoka, Hisayoshi Yurimoto, Takaaki Noguchi, Ryuji Okazaki, Kanako Sakamoto, Shogo Tachibana, Tomoki Nakamura, Sei-ichiro Watanabe e Yuichi Tsuda. "Initial Analysis of Macromolecular Organic Matter in the Asteroid Ryugu samples: Overview". In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.12859.

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