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1. Heliocentric Distance Dependence of Zodiacal Light Observed by Hayabusa2#

Author

Tsumura, Kohji, Matsuura, Shuji, Sano, Kei, Iwata, Takahiro, Yano, Hajime, Kitazato, Kohei, Takimoto, Kohji, Yamada, Manabu, Morota, Tomokatsu, Kouyama, Toru, Hayakawa, Masahiko, Yokota, Yasuhiro, Tatsumi, Eri, Matsuoka, Moe, Sakatani, Naoya, Honda, Rie, Kameda, Shingo, Suzuki, Hidehiko, Cho, Yuichiro, Yoshioka, Kazuo, Ogawa, Kazunori, Shirai, Kei, Sawada, Hirotaka, and Sugita, Seiji

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Zodiacal light (ZL) is sunlight scattered by interplanetary dust particles (IDPs) at optical wavelengths. The spatial distribution of IDPs in the Solar System may hold an important key to understanding the evolution of the Solar System and material transportation within it. The number density of IDPs can be expressed as $n(r) \sim r^{-\alpha}$, and the exponent $\alpha \sim 1.3$ was obtained by previous observations from interplanetary space by Helios 1/2 and Pioneer 10/11 in the 1970s and 1980s. However, no direct measurements of $\alpha$ based on ZL observations from interplanetary space outside Earth's orbit have been performed since then. Here, we introduce initial results for the radial profile of the ZL at optical wavelengths observed over the range 0.76-1.06 au by ONC-T aboard the Hayabusa2# mission in 2021-2022. The ZL brightness we obtained is well reproduced by a model brightness, although there is a small excess of the observed ZL brightness over the model brightness at around 0.9 au. The radial power-law index we obtained is $\alpha = 1.30 \pm 0.08$, which is consistent with previous results based on ZL observations. The dominant source of uncertainty arises from the uncertainty in estimating the diffuse Galactic light (DGL)., Comment: 22 pages, 19 figures, 4 tables, accepted for publication by Earth, Planets and Space

Published
2023
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2. Characterization of the MASCOT landing area by Hayabusa2

Author

Schröder, Stefan, Sakatani, Naoya, Honda, Rie, Tatsumi, Eri, Yokota, Yasuhiro, Domingue, Deborah, Cho, Yuichiro, Kameda, Shingo, Kitazato, Kohei, Kouyama, Toru, Matsuoka, Moe, Miura, Akira, Morota, Tomokatsu, Okada, Tatsuaki, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Sugita, Seiji, Tanaka, Satoshi, Yabuta, Hikaru, Yamada, Manabu, Grott, Matthias, Hamm, Maximilian, Ho, Tra-Mi, Jaumann, Ralf, Mottola, Stefano, Otto, Katharina, Schmitz, Nicole, and Scholten, Frank

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Context. After landing on C-type asteroid Ryugu, MASCOT imaged brightly colored, submillimeter-sized inclusions in a small rock. Hayabusa2 successfully returned a sample of small particles from the surface of Ryugu, but none of these appear to harbor such inclusions. The samples are considered representative of Ryugu. Aims. To understand the apparent discrepancy between MASCOT observations and Ryugu samples, we assess whether the MASCOT landing site, and the rock by implication, is perhaps atypical for Ryugu. Methods. We analyzed observations of the MASCOT landing area acquired by three instruments on board Hayabusa2: a camera (ONC), a near-infrared spectrometer (NIRS3), and a thermal infrared imager (TIR). We compared the landing area properties thus retrieved with those of the average Ryugu surface. Results. We selected several areas and landforms in the landing area for analysis: a small crater, a collection of smooth rocks, and the landing site itself. The crater is relatively blue and the rocks are relatively red. The spectral and thermophysical properties of the landing site are very close to those of the average Ryugu surface. The spectral properties of the MASCOT rock are probably close to average, but its thermal inertia may be somewhat higher. Conclusions. The MASCOT rock can also be considered representative of Ryugu. Some of the submillimeter-sized particles in the returned samples stand out because of their atypical spectral properties. Such particles may be present as inclusions in the MASCOT rock.

Published
2022
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3. The spatial distribution of impact craters on Ryugu

Author

Hirata, Naoyuki, Morota, Tomokatsu, Cho, Yuichiro, Kanamaru, Masanori, Watanabe, Sei-ichiro, Sugita, Seiji, Hirata, Naru, Yamamoto, Yukio, Noguchi, Rina, Shimaki, Yuri, Tatsumi, Eri, Yoshioka, Kazuo, Sawada, Hirotaka, Yokota, Yasuhiro, Sakatani, Naoya, Hayakawa, Masahiko, Matsuoka, Moe, Honda, Rie, Kameda, Shingo, Yamada, Mamabu, Kouyama, Toru, Suzuki, Hidehiko, Honda, Chikatoshi, Ogawa, Kazunori, Tsuda, Yuichi, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Nakazawa, Satoru, Kikuchi, Shota, Yamaguchi, Tomohiro, Ogawa, Naoko, Ono, Go, Mimasu, Yuya, Yoshikawa, Kent, Takahashi, Tadateru, Takei, Yuto, Fujii, Atsushi, Takeuchi, Hiroshi, Okada, Tatsuaki, Shirai, Kei, and Iijima, Yu-ichi

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Asteroid 162173 Ryugu has numerous craters. The initial measurement of impact craters on Ryugu, by Sugita et al. (2019), is based on Hayabusa2 ONC images obtained during the first month after the arrival of Hayabusa2 in June 2018. Utilizing new images taken until February 2019, we constructed a global impact crater catalogue of Ryugu, which includes all craters larger than 20 m in diameter on the surface of Ryugu. As a result, we identified 77 craters on the surface of Ryugu. Ryugu shows variation in crater density which cannot be explained by the randomness of cratering; there are more craters at lower latitudes and fewer at higher latitudes, and fewer craters in the western bulge (160 E - 290 E) than in the region around the meridian (300 E - 30 E). This variation implies a complicated geologic history for Ryugu. It seems that the longitudinal variation in crater density simply indicates variation in the crater ages; the cratered terrain around the meridian seems to be geologically old while the western bulge is relatively young. The latitudinal variation in crater density suggests that the equatorial ridge of Ryugu is a geologically old structure; however, this could be alternatively explained by a collision with many fission fragments during a short rotational period of Ryugu in the past., Comment: 18 pages 3 figures

Published
2022
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4. Resurfacing processes constrained by crater distribution on Ryugu

Author

Takaki, Naofumi, Cho, Yuichiro, Morota, Tomokatsu, Tatsumi, Eri, Honda, Rie, Kameda, Shingo, Yokota, Yasuhiro, Sakatani, Naoya, Kouyama, Toru, Hayakawa, Masahiko, Matsuoka, Moe, Yamada, Manabu, Honda, Chikatoshi, Suzuki, Hidehiko, Yoshioka, Kazuo, Ogawa, Kazunori, Sawada, Hirotaka, Michel, Patrick, and Sugita, Seiji

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Understanding the geological modification processes on asteroids can provide information concerning their surface history. Images of small asteroids from spacecraft show a depletion in terms of smaller craters. Seismic shaking was considered to be responsible for crater erasure and the main driver modifying the geology of asteroids via regolith convection or the Brazil nut effect. However, a recent artificial impact experiment on the asteroid Ryugu by the Japanese Hayabusa2 mission revealed minimal seismic activity. To investigate whether a seismic shaking model can reproduce the observed crater record, the crater distribution on Ryugu was analyzed using crater production functions under cohesionless conditions. Crater retention ages were estimated as a function of crater diameter for Ryugu, Itokawa, Eros, and Bennu using the crater size-frequency distribution and crater production function estimated for those asteroids. We found that the power-law indices "a" are inconsistent with diffusion processes (e.g., seismic shaking, a=2). This result suggests that seismic shaking models based on diffusion equations cannot explain the crater distribution on small asteroids. Alternative processes include surface flows, possibly at the origin of geomorphological and spectral features of Ryugu. We demonstrate that the vertical mixing of material at depths shallower than 1 m occurs over 10^3-10^5 yr by cratering and obliteration. The young surface age of Ryugu is consistent with the slow space weathering that results from cratering, as suggested in previous studies. The timescale (10^4-10^6 yr) required for resurfacing at depths of 2-4 m can be compared with the cosmic-ray exposure ages of returned samples to constrain the distribution of impactors that collide with Ryugu., Comment: 30 pages, 9 figures, 2 tables. Submitted to Icarus

Published
2021
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5. Image registration for multi-band images taken by ONC-T onboard Hayabusa2

Author

Kouyama, Toru, Tatsumi, Eri, Honda, Chikatoshi, Honda, Rie, Morota, Tomokatsu, Yokota, Yasuhiro, Kameda, Shingo, Yamada, Manabu, Suzuki, Hidehiko, Sakatani, Naoya, Hayakawa, Masahiko, Cho, Yuichiro, Matsuoka, Moe, Yoshioka, Kazuo, Sawada, Hirotaka, and Sugita, Seiji

Subjects
Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Hayabusa2, a Japanese sample-return mission to a C-type asteroid, arrived at its target 162173 Ryugu in June 2018. The optical navigation cameras (ONC-T, ONC-W1, ONC-W2) successfully obtained numerous images of Ryugu. ONC-T is a telescopic framing camera with a charge-coupled device (CCD), has seven filter bands in ultraviolet, visible and near infrared wavelength ranges, and were used to map the spectral distribution of the Ryugu surface. Since the locations of a target seen in ONC-T images are slightly different among different wavelength images in one multi-band observation sequence due to changes in spacecraft positions and attitudes during the filter-changing sequence, one of the image processing issues is image co-registration among images for different wavelength bands. To quickly complete the image co-registration to meet a limited mission schedule, we combined conventional image co-registration techniques with several improvements based on previous planetary missions. The results of our analysis using actual ONC-T images indicate that image co-registration can reach accuracy on the order of 0.1 pixels, which is sufficient for many spectral mapping applications for Ryugu analyses., Comment: Hayabusa2, ONC-T, Multi-band imaging, Image co-registration, Cross correlation

Published
2021

6. High-Resolution Observations of Bright Boulders on Asteroid Ryugu: 1. Size Frequency Distribution and Morphology

Author

Sugimoto, Chiho, Tatsumi, Eri, Cho, Yuichiro, Morota, Tomokatsu, Honda, Rie, Kameda, Shingo, Yokota, Yosuhiro, Yumoto, Koki, Aoki, Minami, DellaGiustina, Daniella N., Michikami, Tatsuhiro, Hiroi, Takahiro, Domingue, Deborah L., Michel, Patrick, Schröder, Stefan E., Nakamura, Tomoki, Yamada, Manabu, Sakatani, Naoya, Kouyama, Toru, Honda, Chikatoshi, Hayakawa, Masahiko, Matsuoka, Moe, Suzuki, Hidehiko, Yoshioka, Kazuo, Ogawa, Kazunori, Sawada, Hirotaka, Arakawa, Masahiko, Saiki, Takanao, Imamura, Hiroshi, Takagi, Yasuhiko, Yano, Hajime, Shirai, Kei, Okamoto, Chisato, Tsuda, Yuichi, Nakazawa, Satoru, Iijima, Yuichi, and Sugita, Seiji

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

The near-Earth asteroid (162173) Ryugu displays a Cb-type average spectrum and a very low average normal albedo of 0.04. Although the majority of boulders on Ryugu have reflectance spectra and albedo similar to the Ryugu average, a small fraction of boulders exhibit anomalously high albedo and distinctively different spectra. A previous study (Tatsumi et al., 2021) based on the 2.7-km observations and a series of low-altitude (down to 68 m) descent observations conducted prior to the first touchdown have shown that the spectra of these anomalous boulders can be classified into two distinct groups corresponding to S and C type asteroids. The former originate most likely from an impactor that collided with Ryugu's parent body, whereas the latter may be from portions of Ryugu's parent body that experienced a different temperature history than experienced by the majority of boulder materials. In this study, we analyzed images captured after the first touchdown to determine the quantitative properties of these bright boulders on Ryugu. We measured the sizes of more than a thousand bright boulders and characterized the morphologic properties of the largest ones. Analyses revealed many properties of bright boulders important for the evolution of Ryugu and its parent body. The size-frequency distributions of S- and C-type bright boulders follow power laws. We obtained the ratios of the total volume and surface area of S-type bright boulders to those of average dark boulders on the Ryugu surface. Also, many of the bright boulders are embedded in a larger substrate boulder, suggesting that they have experienced mixing and conglomeration with darker fragments on the parent body, rather than gently landing on Ryugu during or after its formation by reaccumulation. This is consistent with the hypothesis that S-type bright boulders were likely mixed during and/or before a catastrophic disruption., Comment: 19 pages, 11 figures, 3 Tables, published in Icarus, 369, 15 November, 2021, 114529

Published
2021
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7. High-Resolution Observations of Bright Boulders on Asteroid Ryugu: 2. Spectral Properties

Author

Sugimoto, Chiho, Tatsumi, Eri, Cho, Yuichiro, Morota, Tomokatsu, Honda, Rie, Kameda, Shingo, Yokota, Yosuhiro, Yumoto, Koki, Aoki, Minami, DellaGiustina, Daniella N., Michikami, Tatsuhiro, Hiroi, Takahiro, Domingue, Deborah L., Michel, Patrick, Schröder, Stefan, Nakamura, Tomoki, Yamada, Manabu, Sakatani, Naoya, Kouyama, Toru, Honda, Chikatoshi, Hayakawa, Masahiko, Matsuoka, Moe, Suzuki, Hidehiko, Yoshioka, Kazuo, Ogawa, Kazunori, Sawada, Hirotaka, Arakawa, Masahiko, Saiki, Takanao, Imamura, Hiroshi, Takagi, Yasuhiko, Yano, Hajime, Shirai, Kei, Okamoto, Chisato, Tsuda, Yuichi, Nakazawa, Satoru, Iijima, Yuichi, and Sugita, Seiji

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Many small boulders with reflectance values higher than 1.5 times the average reflectance have been found on the near-Earth asteroid 162173 Ryugu. Based on their visible wavelength spectral differences, Tatsumi et al. (2021) defined two bright boulder classes: C-type and S-type. These two classifications of bright boulders have different size distributions and spectral trends. In this study, we measured the spectra of 79 bright boulders and investigated their detailed spectral properties. Analyses obtained a number of important results. First, S-type bright boulders on Ryugu have spectra that are similar to those found for two different ordinary chondrites with different initial spectra that have been experimentally space weathered the same way. This suggests that there may be two populations of S-type bright boulders on Ryugu, perhaps originating from two different impactors that hit its parent body. Second, the model space-weathering ages of meter-size S-type bright boulders, based on spectral change rates derived in previous experimentally irradiated ordinary chondrites, are 0.1-1 Myr, which is consistent with the crater retention age (

Published
2021
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8. Simultaneous geometric calibration and orbit-attitude determination of Hayabusa2’s deployable camera (DCAM3)

Author

Kikuchi, Shota, Shirai, Kei, Ishibashi, Ko, Wada, Koji, Yokota, Yasuhiro, Honda, Rie, Kadono, Toshihiko, Shimaki, Yuri, Sakatani, Naoya, Ogawa, Kazunori, Sawada, Hirotaka, Saiki, Takanao, Mimasu, Yuya, Takei, Yuto, Sugita, Seiji, Kouyama, Toru, Hirata, Naru, Nakazawa, Satoru, Yoshikawa, Makoto, Tanaka, Satoshi, Watanabe, Sei-ichiro, Tsuda, Yuichi, and Arakawa, Masahiko

Published
2024
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9. Space weathering acts strongly on the uppermost surface of Ryugu

Author

Matsuoka, Moe, Kagawa, Ei-ichi, Amano, Kana, Nakamura, Tomoki, Tatsumi, Eri, Osawa, Takahito, Hiroi, Takahiro, Milliken, Ralph, Domingue, Deborah, Takir, Driss, Brunetto, Rosario, Barucci, Antonella, Kitazato, Kohei, Sugita, Seiji, Fujioka, Yuri, Sasaki, Osamu, Kobayashi, Shiho, Iwata, Takahiro, Morota, Tomokatsu, Yokota, Yasuhiro, Kouyama, Toru, Honda, Rie, Kameda, Shingo, Cho, Yuichiro, Yoshioka, Kazuo, Sawada, Hirotaka, Hayakawa, Masahiko, Sakatani, Naoya, Yamada, Manabu, Suzuki, Hidehiko, Honda, Chikatoshi, Ogawa, Kazunori, Shirai, Kei, Lantz, Cateline, Rubino, Stefano, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Yada, Toru, Nishimura, Masahiro, Nakato, Aiko, Miyazaki, Akiko, Yogata, Kasumi, Abe, Masanao, Okada, Tatsuaki, Usui, Tomohiro, Yoshikawa, Makoto, Saiki, Takanao, Tanaka, Satoshi, Terui, Fuyuto, Nakazawa, Satoru, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2023
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11. The Western Bulge of 162173 Ryugu Formed as a Result of a Rotationally Driven Deformation Process

Author

Hirabayashi, Masatoshi, Tatsumi, Eri, Miyamoto, Hideaki, Komatsu, Goro, Sugita, Seiji, Watanabe, Sei-ichiro, Scheeres, Daniel J., Barnouin, Olivier S., Michel, Patrick, Honda, Chikatoshi, Michikami, Tatsuhiro, Cho, Yuichiro, Morota, Tomokatsu, Hirata, Naru, Hirata, Naoyuki, Sakatani, Naoya, Schwartz, Stephen R., Honda, Rie, Yokota, Yasuhiro, Kameda, Shingo, Suzuki, Hidehiko, Kouyama, Toru, Hayakawa, Masahiko, Matsuoka, Moe, Yoshioka, Kazuo, Ogawa, Kazunori, Sawada, Hirotaka, Yoshikawa, Makoto, and Tsuda, Yuichi

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

162173 Ryugu, the target of Hayabusa2, has a round shape with an equatorial ridge, which is known as a spinning top-shape. A strong centrifugal force is a likely contributor to Ryugu's top-shaped features. Observations by Optical Navigation Camera onboard Hayabusa2 show a unique longitudinal variation in geomorphology; the western side of this asteroid, later called the western bulge, has a smooth surface and a sharp equatorial ridge, compared to the other side. Here, we propose a structural deformation process that generated the western bulge. Applying the mission-derived shape model, we employ a finite element model technique to analyze the locations that experience structural failure within the present shape. Assuming that materials are uniformly distributed, our model shows the longitudinal variation in structurally failed regions when the spin period is shorter than ~3.75 h. Ryugu is structurally intact in the subsurface region of the western bulge while other regions are sensitive to structural failure. We infer that this variation is indicative of the deformation process that occurred in the past, and the western bulge is more relaxed structurally than the other region. Our analysis also shows that this deformation process might occur at a spin period between ~3.5 h and ~3.0 h, providing the cohesive strength ranging between ~4 Pa and ~10 Pa., Comment: 8 pages, 5 figures, published in the Astrophysical Journal Letters, 874, 1, L10

Published
2019
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12. Thermal conductivity and coordination number of compressed dust aggregates

Author

Arakawa, Sota, Tatsuuma, Misako, Sakatani, Naoya, and Nakamoto, Taishi

Subjects
Astrophysics - Earth and Planetary Astrophysics, Condensed Matter - Soft Condensed Matter
Abstract

Understanding the heat transfer mechanism within dust aggregates is of great importance for many subjects in planetary science. We calculated the coordination number and the thermal conductivity through the solid network of compressed dust aggregates. We found a simple relationship between the coordination number and the filling factor and revealed that the thermal conductivity through the solid network of aggregates is represented by a power-law function of the filling factor and the coordination number., Comment: 8 pages, 7 figures. Accepted for publication in Icarus. arXiv admin note: text overlap with arXiv:1711.06268

Published
2019
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13. Updated Inflight Calibration of Hayabusa2's Optical Navigation Camera (ONC) for Scientific Observations during the Cruise Phase

Author

Tatsumi, Eri, Kouyama, Toru, Suzuki, Hidehiko, Yamada, Manabu, Sakatani, Naoya, Kameda, Shingo, Yokota, Yasuhiro, Honda, Rie, Morota, Tomokatsu, Moroi, Keiichi, Tanabe, Naoya, Kamiyoshihara, Hiroaki, Ishida, Marika, Yoshioka, Kazuo, Sato, Hiroyuki, Honda, Chikatoshi, Hayakawa, Masahiko, Kitazato, Kohei, Sawada, Hirotaka, and Sugita, Seiji

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract

The Optical Navigation Camera (ONC-T, ONC-W1, ONC-W2) onboard Hayabusa2 are also being used for scientific observations of the mission target, C-complex asteroid 162173 Ryugu. Science observations and analyses require rigorous instrument calibration. In order to meet this requirement, we have conducted extensive inflight observations during the 3.5 years of cruise after the launch of Hayabusa2 on 3 December 2014. In addition to the first inflight calibrations by Suzuki et al. (2018), we conducted an additional series of calibrations, including read-out smear, electronic-interference noise, bias, dark current, hot pixels, sensitivity, linearity, flat-field, and stray light measurements for the ONC. Moreover, the calibrations, especially flat-fields and sensitivities, of ONC-W1 and -W2 are updated for the analysis of the low-altitude (i.e., high-resolution) observations, such as the gravity measurement, touchdowns, and the descents for MASCOT and MINERVA-II payload releases. The radiometric calibration for ONC-T is also updated in this study based on star and Moon observations. Our updated inflight sensitivity measurements suggest the accuracy of the absolute radiometric calibration contains less than 1.8% error for the ul-, b-, v-, Na-, w-, and x-bands based on star calibration observations and ~5% for the p-band based on lunar calibration observations. The radiance spectra of the Moon, Jupiter, and Saturn from the ONC-T show good agreement with the spacecraft-based observations of the Moon from SP/SELENE and WAC/LROC and with ground-based telescopic observations for Jupiter and Saturn., Comment: Submitted to Icarus

Published
2018
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14. Asteroid Ryugu Before the Hayabusa2 Encounter

Author

Wada, Koji, Grott, Matthias, Michel, Patrick, Walsh, Kevin J., Barucci, Antonella M., Biele, Jens, Blum, Jürgen, Ernst, Carolyn M., Grundmann, Jan T., Gundlach, Bastian, Hagermann, Axel, Hamm, Maximilian, Jutzi, Martin, Kim, Myung-Jin, Kührt, Ekkehard, Corre, Lucille Le, Libourel, Guy, Lichtenheldt, Roy, Maturilli, Alessandro, Messenger, Scott R., Michikami, Tatsuhiro, Miyamoto, Hideaki, Mottola, Stefano, Nakamura, Akiko M., Müller, Thomas, Nittler, Larry R., Ogawa, Kazunori, Okada, Tatsuaki, Palomba, Ernesto, Sakatani, Naoya, Schröder, Stefan, Senshu, Hiroki, Takir, Driss, and Zolensky, Michael E.

Subjects
Astrophysics - Earth and Planetary Astrophysics
Abstract

Asteroid (162173) Ryugu is the target object of Hayabusa2, an asteroid exploration and sample return mission led by Japan Aerospace Exploration Agency (JAXA). Ground-based observations indicate that Ryugu is a C-type near-Earth asteroid with a diameter of less than 1 km, but the knowledge of its detailed properties is still very limited. This paper summarizes our best understanding of the physical and dynamical properties of Ryugu based on remote sensing and theoretical modeling. This information is used to construct a design reference model of the asteroid that is used for formulation of mission operations plans in advance of asteroid arrival. Particular attention is given to the surface properties of Ryugu that are relevant to sample acquisition. This reference model helps readers to appropriately interpret the data that will be directly obtained by Hayabusa2 and promotes scientific studies not only for Ryugu itself and other small bodies but also for the Solar System evolution that small bodies shed light on., Comment: 62 pages, 10 figures, 8 tables. Submitted to Space Science Reviews, on 6 April 2018

Published
2018

16. Hayabusa2 pinpoint touchdown near the artificial crater on Ryugu: Trajectory design and guidance performance

Author

Kikuchi, Shota, Saiki, Takanao, Takei, Yuto, Terui, Fuyuto, Ogawa, Naoko, Mimasu, Yuya, Ono, Go, Yoshikawa, Kent, Sawada, Hirotaka, Takeuchi, Hiroshi, Ikeda, Hitoshi, Fujii, Atsushi, Sugita, Seiji, Morota, Tomokatsu, Yamada, Manabu, Honda, Rie, Yokota, Yasuhiro, Sakatani, Naoya, Kameda, Shingo, Kouyama, Toru, Hirata, Naru, Hirata, Naoyuki, Shirai, Kei, Kitazato, Kohei, Nakazawa, Satoru, Yoshikawa, Makoto, Tanaka, Satoshi, Wada, Koji, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Published
2021
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17. Measurement of Microscopic Thermal Diffusivity Distribution for Ryugu Sample by Infrared Lock-in Periodic Heating Method

Author

Ishizaki, Takuya, Nagano, Hosei, Tanaka, Satoshi, Sakatani, Naoya, Nakamura, Tomoki, Okada, Tatsuaki, Fujita, Ryohei, Alasli, Abdulkareem, Morita, Tomoyo, Kikuiri, Mizuha, Amano, Kana, Kagawa, Eiichi, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Watanabe, Sei-ichiro, Tsuda, Yuichi, Ishizaki, Takuya, Nagano, Hosei, Tanaka, Satoshi, Sakatani, Naoya, Nakamura, Tomoki, Okada, Tatsuaki, Fujita, Ryohei, Alasli, Abdulkareem, Morita, Tomoyo, Kikuiri, Mizuha, Amano, Kana, Kagawa, Eiichi, Yurimoto, Hisayoshi, Noguchi, Takaaki, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Abstract

The thermophysical properties of small Solar System bodies are essential to be determined, on which the thermal evolution of small bodies largely depends. The carbonaceous asteroid Ryugu is one of the small undifferentiated bodies formed in the early Solar System. Hayabusa2 explored the asteroid Ryugu and returned the surface samples in 2020 for detailed on-ground investigation, including measurements of thermal properties. Because the available sample amount was limited, this study developed a novel method to measure the thermal diffusivity of small and irregularly shaped samples of about 1 mm in diameter by combining lock-in thermography and periodic heating methods on the microscale. This method enables us to measure the thermal diffusivity of both flat-plate and granular shape samples by selecting the suitable detecting direction of the temperature response. Especially, when the sample has a flat-plate shape, the anisotropic distribution of the in-plane thermal diffusivity can be evaluated. This method was applied to six Ryugu samples, and the detailed anisotropic distribution of the thermal diffusivity was obtained. The measurement results showed that the samples show local thermal anisotropy caused by cracks and voids. The average thermal diffusivity among all samples was (2.8 to 5.8) × 10^−7 m2·s. Based on the density and specific heat of the samples obtained independently, the thermal effusivity was estimated to be 791 J·(s^1/2·m^2·K) to 1253 J·(s^1/2·m^2·K), which is defined as the resistance of surface temperature to the change of thermal input. The determined thermal effusivity, often called thermal inertia in planetary science, is larger than the observed value of 225 ± 45 J· (s^1/2·m^2·K) of the asteroid Ryugu's surface, obtained from the diurnal temperature change of the rotating asteroid by a thermal infrared camera onboard Hayabuas2. This difference is likely to be attributed to the difference in the analytical scale between the sample and the surfac

Published
2024

18. Spectrally blue hydrated parent body of asteroid (162173) Ryugu

Author

Tatsumi, Eri, Sakatani, Naoya, Riu, Lucie, Matsuoka, Moe, Honda, Rie, Morota, Tomokatsu, Kameda, Shingo, Nakamura, Tomoki, Zolensky, Michael, Brunetto, Rosario, Hiroi, Takahiro, Sasaki, Sho, Watanabe, Sei’ichiro, Tanaka, Satoshi, Takita, Jun, Pilorget, Cédric, de León, Julia, Popescu, Marcel, Rizos, Juan Luis, Licandro, Javier, Palomba, Ernesto, Domingue, Deborah, Vilas, Faith, Campins, Humberto, Cho, Yuichiro, Yoshioka, Kazuo, Sawada, Hirotaka, Yokota, Yasuhiro, Hayakawa, Masahiko, Yamada, Manabu, Kouyama, Toru, Suzuki, Hidehiko, Honda, Chikatoshi, Ogawa, Kazunori, Kitazato, Kohei, Hirata, Naru, Hirata, Naoyuki, Tsuda, Yuichi, Yoshikawa, Makoto, Saiki, Takanao, Terui, Fuyuto, Nakazawa, Satoru, Takei, Yuto, Takeuchi, Hiroshi, Yamamoto, Yukio, Okada, Tatsuaki, Shimaki, Yuri, Shirai, Kei, and Sugita, Seiji

Published
2021
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19. Design of telescopic nadir imager for geomorphology (TENGOO) and observation of surface reflectance by optical chromatic imager (OROCHI) for the Martian Moons Exploration (MMX)

Author

Kameda, Shingo, Ozaki, Masanobu, Enya, Keigo, Fuse, Ryota, Kouyama, Toru, Sakatani, Naoya, Suzuki, Hidehiko, Osada, Naoya, Kato, Hiroki, Miyamoto, Hideaki, Yamazaki, Atsushi, Nakamura, Tomoki, Okamoto, Takaya, Ishimaru, Takahiro, Hong, Peng, Ishibashi, Ko, Takashima, Takeshi, Ishigami, Ryoya, Kuo, Cheng-Ling, Abe, Shinsuke, Goda, Yuya, Murao, Hajime, Fujishima, Saori, Aoyama, Tsubasa, Hagiwara, Keiji, Mizumoto, Satoko, Tanaka, Noriko, Murakami, Kousuke, Matsumoto, Miho, Tanaka, Kenji, and Sakuta, Hironobu

Published
2021
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21. Alignment determination of the Hayabusa2 laser altimeter (LIDAR)

Author

Noda, Hirotomo, Senshu, Hiroki, Matsumoto, Koji, Namiki, Noriyuki, Mizuno, Takahide, Sugita, Seiji, Abe, Shinsuke, Araki, Hiroshi, Asari, Kazuyoshi, Cho, Yuichiro, Fujii, Atsushi, Hayakawa, Masahiko, Higuchi, Arika, Hirata, Naoyuki, Hirata, Naru, Honda, Chikatoshi, Honda, Rie, Ishihara, Yoshiaki, Kameda, Shingo, Kikuchi, Shota, Kouyama, Toru, Matsuoka, Moe, Mimasu, Yuya, Morota, Tomokatsu, Nakazawa, Satoru, Ogawa, Kazunori, Ogawa, Naoko, Ono, Go, Oshigami, Shoko, Saiki, Takanao, Sakatani, Naoya, Sasaki, Sho, Sawada, Hirotaka, Shizugami, Makoto, Suzuki, Hidehiko, Takahashi, Tadateru, Takei, Yuto, Tanaka, Satoshi, Tatsumi, Eri, Terui, Fuyuto, Tsuda, Yuichi, Tsuruta, Seiitsu, Watanabe, Sei-ichiro, Yamada, Manabu, Yamada, Ryuhei, Yamaguchi, Tomohiro, Yamamoto, Keiko, Yokota, Yasuhiro, Yoshida, Fumi, Yoshikawa, Kent, Yoshikawa, Makoto, and Yoshioka, Kazuo

Published
2021
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22. Surface environment of Phobos and Phobos simulant UTPS

Author

Miyamoto, Hideaki, Niihara, Takafumi, Wada, Koji, Ogawa, Kazunori, Senshu, Hiroki, Michel, Patrick, Kikuchi, Hiroshi, Hemmi, Ryodo, Nakamura, Tomoki, Nakamura, Akiko M., Hirata, Naoyuki, Sasaki, Sho, Asphaug, Erik, Britt, Daniel T., Abell, Paul A., Ballouz, Ronald-Louis, Banouin, Olivier S., Baresi, Nicola, Barucci, Maria A., Biele, Jens, Grott, Matthias, Hino, Hideitsu, Hong, Peng K., Imada, Takane, Kameda, Shingo, Kobayashi, Makito, Libourel, Guy, Mogi, Katsuro, Murdoch, Naomi, Nishio, Yuki, Okamoto, Shogo, Ota, Yuichiro, Otsuki, Masatsugu, Otto, Katharina A., Sakatani, Naoya, Shimizu, Yuta, Takemura, Tomohiro, Terada, Naoki, Tsukamoto, Masafumi, Usui, Tomohiro, and Willner, Konrad

Published
2021
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23. Highly porous nature of a primitive asteroid revealed by thermal imaging

Author

Okada, Tatsuaki, Fukuhara, Tetsuya, Tanaka, Satoshi, Taguchi, Makoto, Arai, Takehiko, Senshu, Hiroki, and Sakatani, Naoya

Subjects
Asteroids -- Thermal properties -- Natural history -- Observations, Porosity -- Observations, Carbonaceous rocks -- Thermal properties -- Natural history -- Observations, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Carbonaceous (C-type) asteroids.sup.1 are relics of the early Solar System that have preserved primitive materials since their formation approximately 4.6 billion years ago. They are probably analogues of carbonaceous chondrites.sup.2,3 and are essential for understanding planetary formation processes. However, their physical properties remain poorly known because carbonaceous chondrite meteoroids tend not to survive entry to Earth's atmosphere. Here we report on global one-rotation thermographic images of the C-type asteroid 162173 Ryugu, taken by the thermal infrared imager (TIR).sup.4 onboard the spacecraft Hayabusa2.sup.5, indicating that the asteroid's boulders and their surroundings have similar temperatures, with a derived thermal inertia of about 300 J m.sup.-2 s.sup.-0.5 K.sup.-1 (300 tiu). Contrary to predictions that the surface consists of regolith and dense boulders, this low thermal inertia suggests that the boulders are more porous than typical carbonaceous chondrites.sup.6 and that their surroundings are covered with porous fragments more than 10 centimetres in diameter. Close-up thermal images confirm the presence of such porous fragments and the flat diurnal temperature profiles suggest a strong surface roughness effect.sup.7,8. We also observed in the close-up thermal images boulders that are colder during the day, with thermal inertia exceeding 600 tiu, corresponding to dense boulders similar to typical carbonaceous chondrites.sup.6. These results constrain the formation history of Ryugu: the asteroid must be a rubble pile formed from impact fragments of a parent body with microporosity.sup.9 of approximately 30 to 50 per cent that experienced a low degree of consolidation. The dense boulders might have originated from the consolidated innermost region or they may have an exogenic origin. This high-porosity asteroid may link cosmic fluffy dust to dense celestial bodies.sup.10. Thermal imaging data obtained from the spacecraft Hayabusa2 reveal that the carbonaceous asteroid 162173 Ryugu is an object of unusually high porosity., Author(s): Tatsuaki Okada [sup.1] [sup.2] , Tetsuya Fukuhara [sup.3] , Satoshi Tanaka [sup.1] [sup.4] [sup.5] , Makoto Taguchi [sup.3] , Takehiko Arai [sup.6] , Hiroki Senshu [sup.7] , Naoya Sakatani [...]

Published
2020
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24. Heliocentric distance dependence of zodiacal light observed by Hayabusa2#

Author

Tsumura, Kohji, primary, Matsuura, Shuji, additional, Sano, Kei, additional, Iwata, Takahiro, additional, Yano, Hajime, additional, Kitazato, Kohei, additional, Takimoto, Kohji, additional, Yamada, Manabu, additional, Morota, Tomokatsu, additional, Kouyama, Toru, additional, Hayakawa, Masahiko, additional, Yokota, Yasuhiro, additional, Tatsumi, Eri, additional, Matsuoka, Moe, additional, Sakatani, Naoya, additional, Honda, Rie, additional, Kameda, Shingo, additional, Suzuki, Hidehiko, additional, Cho, Yuichiro, additional, Yoshioka, Kazuo, additional, Ogawa, Kazunori, additional, Shirai, Kei, additional, Sawada, Hirotaka, additional, and Sugita, Seiji, additional

Published
2023
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25. A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu

Author

Noguchi, Takaaki, Matsumoto, Toru, Miyake, Akira, Igami, Yohei, Haruta, Mitsutaka, Saito, Hikaru, Hata, Satoshi, Seto, Yusuke, Miyahara, Masaaki, Tomioka, Naotaka, Ishii, Hope A., Bradley, John P., Ohtaki, Kenta K., Dobrică, Elena, Leroux, Hugues, Le Guillou, Corentin, Jacob, Damien, de la Peña, Francisco, Laforet, Sylvain, Marinova, Maya, Langenhorst, Falko, Harries, Dennis, Beck, Pierre, Phan, Thi H. V., Rebois, Rolando, Abreu, Neyda M., Gray, Jennifer, Zega, Thomas, Zanetta, Pierre-M., Thompson, Michelle S., Stroud, Rhonda, Burgess, Kate, Cymes, Brittany A., Bridges, John C., Hicks, Leon, Lee, Martin R., Daly, Luke, Bland, Phil A., Zolensky, Michael E., Frank, David R., Martinez, James, Tsuchiyama, Akira, Yasutake, Masahiro, Matsuno, Junya, Okumura, Shota, Mitsukawa, Itaru, Uesugi, Kentaro, Uesugi, Masayuki, Takeuchi, Akihisa, Sun, Mingqi, Enju, Satomi, Takigawa, Aki, Michikami, Tatsuhiro, Nakamura, Tomoki, Matsumoto, Megumi, Nakauchi, Yusuke, Abe, Masanao, Arakawa, Masahiko, Fujii, Atsushi, Hayakawa, Masahiko, Hirata, Naru, Hirata, Naoyuki, Honda, Rie, Honda, Chikatoshi, Hosoda, Satoshi, Iijima, Yu-ichi, Ikeda, Hitoshi, Ishiguro, Masateru, Ishihara, Yoshiaki, Iwata, Takahiro, Kawahara, Kousuke, Kikuchi, Shota, Kitazato, Kohei, Matsumoto, Koji, Matsuoka, Moe, Mimasu, Yuya, Miura, Akira, Morota, Tomokatsu, Nakazawa, Satoru, Namiki, Noriyuki, Noda, Hirotomo, Noguchi, Rina, Ogawa, Naoko, Ogawa, Kazunori, Okada, Tatsuaki, Okamoto, Chisato, Ono, Go, Ozaki, Masanobu, Saiki, Takanao, Sakatani, Naoya, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Shirai, Kei, Sugita, Seiji, Takei, Yuto, Takeuchi, Hiroshi, Tanaka, Satoshi, Tatsumi, Eri, Terui, Fuyuto, Tsukizaki, Ryudo, Wada, Koji, Yamada, Manabu, Yamada, Tetsuya, Yamamoto, Yukio, Yano, Hajime, Yokota, Yasuhiro, Yoshihara, Keisuke, Yoshikawa, Makoto, Yoshikawa, Kent, Fukai, Ryohta, Furuya, Shizuho, Hatakeda, Kentaro, Hayashi, Tasuku, Hitomi, Yuya, Kumagai, Kazuya, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Soejima, Hiromichi, Suzuki, Ayako I., Usui, Tomohiro, Yada, Toru, Yamamoto, Daiki, Yogata, Kasumi, Yoshitake, Miwa, Connolly, Harold C., Lauretta, Dante S., Yurimoto, Hisayoshi, Nagashima, Kazuhide, Kawasaki, Noriyuki, Sakamoto, Naoya, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Watanabe, Sei-ichiro, Tsuda, Yuichi, Noguchi, Takaaki, Matsumoto, Toru, Miyake, Akira, Igami, Yohei, Haruta, Mitsutaka, Saito, Hikaru, Hata, Satoshi, Seto, Yusuke, Miyahara, Masaaki, Tomioka, Naotaka, Ishii, Hope A., Bradley, John P., Ohtaki, Kenta K., Dobrică, Elena, Leroux, Hugues, Le Guillou, Corentin, Jacob, Damien, de la Peña, Francisco, Laforet, Sylvain, Marinova, Maya, Langenhorst, Falko, Harries, Dennis, Beck, Pierre, Phan, Thi H. V., Rebois, Rolando, Abreu, Neyda M., Gray, Jennifer, Zega, Thomas, Zanetta, Pierre-M., Thompson, Michelle S., Stroud, Rhonda, Burgess, Kate, Cymes, Brittany A., Bridges, John C., Hicks, Leon, Lee, Martin R., Daly, Luke, Bland, Phil A., Zolensky, Michael E., Frank, David R., Martinez, James, Tsuchiyama, Akira, Yasutake, Masahiro, Matsuno, Junya, Okumura, Shota, Mitsukawa, Itaru, Uesugi, Kentaro, Uesugi, Masayuki, Takeuchi, Akihisa, Sun, Mingqi, Enju, Satomi, Takigawa, Aki, Michikami, Tatsuhiro, Nakamura, Tomoki, Matsumoto, Megumi, Nakauchi, Yusuke, Abe, Masanao, Arakawa, Masahiko, Fujii, Atsushi, Hayakawa, Masahiko, Hirata, Naru, Hirata, Naoyuki, Honda, Rie, Honda, Chikatoshi, Hosoda, Satoshi, Iijima, Yu-ichi, Ikeda, Hitoshi, Ishiguro, Masateru, Ishihara, Yoshiaki, Iwata, Takahiro, Kawahara, Kousuke, Kikuchi, Shota, Kitazato, Kohei, Matsumoto, Koji, Matsuoka, Moe, Mimasu, Yuya, Miura, Akira, Morota, Tomokatsu, Nakazawa, Satoru, Namiki, Noriyuki, Noda, Hirotomo, Noguchi, Rina, Ogawa, Naoko, Ogawa, Kazunori, Okada, Tatsuaki, Okamoto, Chisato, Ono, Go, Ozaki, Masanobu, Saiki, Takanao, Sakatani, Naoya, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Shirai, Kei, Sugita, Seiji, Takei, Yuto, Takeuchi, Hiroshi, Tanaka, Satoshi, Tatsumi, Eri, Terui, Fuyuto, Tsukizaki, Ryudo, Wada, Koji, Yamada, Manabu, Yamada, Tetsuya, Yamamoto, Yukio, Yano, Hajime, Yokota, Yasuhiro, Yoshihara, Keisuke, Yoshikawa, Makoto, Yoshikawa, Kent, Fukai, Ryohta, Furuya, Shizuho, Hatakeda, Kentaro, Hayashi, Tasuku, Hitomi, Yuya, Kumagai, Kazuya, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Soejima, Hiromichi, Suzuki, Ayako I., Usui, Tomohiro, Yada, Toru, Yamamoto, Daiki, Yogata, Kasumi, Yoshitake, Miwa, Connolly, Harold C., Lauretta, Dante S., Yurimoto, Hisayoshi, Nagashima, Kazuhide, Kawasaki, Noriyuki, Sakamoto, Naoya, Okazaki, Ryuji, Yabuta, Hikaru, Naraoka, Hiroshi, Sakamoto, Kanako, Tachibana, Shogo, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Abstract

Without a protective atmosphere, space-exposed surfaces of airless Solar System bodies gradually experience an alteration in composition, structure and optical properties through a collective process called space weathering. The return of samples from near-Earth asteroid (162173) Ryugu by Hayabusa2 provides the first opportunity for laboratory study of space-weathering signatures on the most abundant type of inner solar system body: a C-type asteroid, composed of materials largely unchanged since the formation of the Solar System. Weathered Ryugu grains show areas of surface amorphization and partial melting of phyllosilicates, in which reduction from Fe³⁺ to Fe²⁺ and dehydration developed. Space weathering probably contributed to dehydration by dehydroxylation of Ryugu surface phyllosilicates that had already lost interlayer water molecules and to weakening of the 2.7 µm hydroxyl (–OH) band in reflectance spectra. For C-type asteroids in general, this indicates that a weak 2.7 µm band can signify space-weathering-induced surface dehydration, rather than bulk volatile loss.

Published
2023

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

Author

Yokoyama, Tetsuya, Nagashima, Kazuhide, Nakai, Izumi, Young, Edward D., Abe, Yoshinari, Aleon, Jerome, Alexander, Conel M. O'D., Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Namiki, Noriyuki, Noda, Hirotomo, Noguchi, Rina, Ogawa, Naoko, Ogawa, Kazunori, Okada, Tatsuaki, Okamoto, Chisato, Ono, Go, Ozaki, Masanobu, Saiki, Takanao, Bouvier, Audrey, Sakatani, Naoya, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Shirai, Kei, Sugita, Seiji, Takei, Yuto, Takeuchi, Hiroshi, Tanaka, Satoshi, Tatsumi, Eri, Carlson, Richard W., Terui, Fuyuto, Tsuda, Yuichi, Tsukizaki, Ryudo, Wada, Koji, Watanabe, Sei-ichiro, Yamada, Manabu, Yamada, Tetsuya, Yamamoto, Yukio, Yano, Hajime, Yokota, Yasuhiro, Chaussidon, Marc, Yoshihara, Keisuke, Yoshikawa, Makoto, Yoshikawa, Kent, Furuya, Shizuho, Hatakeda, Kentaro, Hayashi, Tasuku, Hitomi, Yuya, Kumagai, Kazuya, Miyazaki, Akiko, Nakato, Aiko, Choi, Byeon-Gak, Nishimura, Masahiro, Soejima, Hiromichi, Suzuki, Ayako, Yada, Toru, Yamamoto, Daiki, Yogata, Kasumi, Yoshitake, Miwa, Tachibana, Shogo, Yurimoto, Hisayoshi, Dauphas, Nicolas, Davis, Andrew M., Di Rocco, Tommaso, Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R., Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Ito, Motoo, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko T., Kitajima, Kouki, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander N., Liu, Ming-Chang, Masuda, Yuki, McKeegan, Kevin D., Morita, Mayu, Motomura, Kazuko, Moynier, Frederic, Nguyen, Ann, Nittler, Larry, Onose, Morihiko, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Russell, Sara S., Sakamoto, Naoya, Schoenbaechler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yoneda, Shigekazu, Yui, Hiroharu, Zhang, Ai-Cheng, Connolly Jr, Harold C., Lauretta, Dante S., Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Arakawa, Masahiko, Fujii, Atsushi, Hayakawa, Masahiko, Hirata, Naoyuki, Hirata, Naru, Honda, Rie, Honda, Chikatoshi, Hosoda, Satoshi, Iijima, Yu-ichi, Ikeda, Hitoshi, Ishiguro, Masateru, Ishihara, Yoshiaki, Iwata, Takahiro, Kawahara, Kosuke, Kikuchi, Shota, Kitazato, Kohei, Matsumoto, Koji, Matsuoka, Moe, Michikami, Tatsuhiro, Mimasu, Yuya, Miura, Akira, Morota, Tomokatsu, Nakazawa, Satoru, Yokoyama, Tetsuya, Nagashima, Kazuhide, Nakai, Izumi, Young, Edward D., Abe, Yoshinari, Aleon, Jerome, Alexander, Conel M. O'D., Amari, Sachiko, Amelin, Yuri, Bajo, Ken-ichi, Bizzarro, Martin, Namiki, Noriyuki, Noda, Hirotomo, Noguchi, Rina, Ogawa, Naoko, Ogawa, Kazunori, Okada, Tatsuaki, Okamoto, Chisato, Ono, Go, Ozaki, Masanobu, Saiki, Takanao, Bouvier, Audrey, Sakatani, Naoya, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Shirai, Kei, Sugita, Seiji, Takei, Yuto, Takeuchi, Hiroshi, Tanaka, Satoshi, Tatsumi, Eri, Carlson, Richard W., Terui, Fuyuto, Tsuda, Yuichi, Tsukizaki, Ryudo, Wada, Koji, Watanabe, Sei-ichiro, Yamada, Manabu, Yamada, Tetsuya, Yamamoto, Yukio, Yano, Hajime, Yokota, Yasuhiro, Chaussidon, Marc, Yoshihara, Keisuke, Yoshikawa, Makoto, Yoshikawa, Kent, Furuya, Shizuho, Hatakeda, Kentaro, Hayashi, Tasuku, Hitomi, Yuya, Kumagai, Kazuya, Miyazaki, Akiko, Nakato, Aiko, Choi, Byeon-Gak, Nishimura, Masahiro, Soejima, Hiromichi, Suzuki, Ayako, Yada, Toru, Yamamoto, Daiki, Yogata, Kasumi, Yoshitake, Miwa, Tachibana, Shogo, Yurimoto, Hisayoshi, Dauphas, Nicolas, Davis, Andrew M., Di Rocco, Tommaso, Fujiya, Wataru, Fukai, Ryota, Gautam, Ikshu, Haba, Makiko K., Hibiya, Yuki, Hidaka, Hiroshi, Homma, Hisashi, Hoppe, Peter, Huss, Gary R., Ichida, Kiyohiro, Iizuka, Tsuyoshi, Ireland, Trevor R., Ishikawa, Akira, Ito, Motoo, Itoh, Shoichi, Kawasaki, Noriyuki, Kita, Noriko T., Kitajima, Kouki, Kleine, Thorsten, Komatani, Shintaro, Krot, Alexander N., Liu, Ming-Chang, Masuda, Yuki, McKeegan, Kevin D., Morita, Mayu, Motomura, Kazuko, Moynier, Frederic, Nguyen, Ann, Nittler, Larry, Onose, Morihiko, Pack, Andreas, Park, Changkun, Piani, Laurette, Qin, Liping, Russell, Sara S., Sakamoto, Naoya, Schoenbaechler, Maria, Tafla, Lauren, Tang, Haolan, Terada, Kentaro, Terada, Yasuko, Usui, Tomohiro, Wada, Sohei, Wadhwa, Meenakshi, Walker, Richard J., Yamashita, Katsuyuki, Yin, Qing-Zhu, Yoneda, Shigekazu, Yui, Hiroharu, Zhang, Ai-Cheng, Connolly Jr, Harold C., Lauretta, Dante S., Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Okazaki, Ryuji, Sakamoto, Kanako, Yabuta, Hikaru, Abe, Masanao, Arakawa, Masahiko, Fujii, Atsushi, Hayakawa, Masahiko, Hirata, Naoyuki, Hirata, Naru, Honda, Rie, Honda, Chikatoshi, Hosoda, Satoshi, Iijima, Yu-ichi, Ikeda, Hitoshi, Ishiguro, Masateru, Ishihara, Yoshiaki, Iwata, Takahiro, Kawahara, Kosuke, Kikuchi, Shota, Kitazato, Kohei, Matsumoto, Koji, Matsuoka, Moe, Michikami, Tatsuhiro, Mimasu, Yuya, Miura, Akira, Morota, Tomokatsu, and Nakazawa, Satoru

Abstract

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 compositions of Ryugu samples. The samples are mainly composed of materials similar to those of carbonaceous chondrite meteorites, particularly the CI (Ivuna-type) group. The samples consist predominantly of minerals formed in aqueous fluid on a parent planetesimal. The primary minerals were altered by fluids at a temperature of 37 degrees +/- 10 degrees C, about 5.2(-0.7)(+0.8) million (statistical) or 5.2(-2.1)(+1.6) million (systematic) years after the formation of the first solids in the Solar System. After aqueous alteration, the Ryugu samples were likely never heated above similar to 100 degrees C. The samples have a chemical composition that more closely resembles that of the Sun's photosphere than other natural samples do.

Published
2023

28. Noble gases and nitrogen in samples of asteroid Ryugu record its volatile sources and recent surface evolution

Author

Okazaki, Ryuji, Marty, Bernard, Busemann, Henner, Hashizume, Ko, Gilmour, Jamie D., Meshik, Alex, Yada, Toru, Kitajima, Fumio, Broadley, Michael W., Byrne, David, Füri, Evelyn, Riebe, My E. I., Krietsch, Daniela, Maden, Colin, Ishida, Akizumi, Clay, Patricia, Crowther, Sarah A., Fawcett, Lydia, Lawton, Thomas, Pravdivtseva, Olga, Miura, Yayoi N., Park, Jisun, Bajo, Ken-ichi, Takano, Yoshinori, Yamada, Keita, Kawagucci, Shinsuke, Matsui, Yohei, Yamamoto, Mizuki, Righter, Kevin, Sakai, Saburo, Iwata, Naoyoshi, Shirai, Naoki, Sekimoto, Shun, Inagaki, Makoto, Ebihara, Mitsuru, Yokochi, Reika, Nishiizumi, Kunihiko, Nagao, Keisuke, Lee, Jong Ik, Kano, Akihiro, Caffee, Marc W., Uemura, Ryu, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Yabuta, Hikaru, Yurimoto, Hisayoshi, Tachibana, Shogo, Sawada, Hirotaka, Sakamoto, Kanako, Abe, Masanao, Arakawa, Masahiko, Fujii, Atsushi, Hayakawa, Masahiko, Hirata, Naoyuki, Hirata, Naru, Honda, Rie, Honda, Chikatoshi, Hosoda, Satoshi, Iijima, Yu-ichi, Ikeda, Hitoshi, Ishiguro, Masateru, Ishihara, Yoshiaki, Iwata, Takahiro, Kawahara, Kosuke, Kikuchi, Shota, Kitazato, Kohei, Matsumoto, Koji, Matsuoka, Moe, Michikami, Tatsuhiro, Mimasu, Yuya, Miura, Akira, Morota, Tomokatsu, Nakazawa, Satoru, Namiki, Noriyuki, Noda, Hirotomo, Noguchi, Rina, Ogawa, Naoko, Ogawa, Kazunori, Okada, Tatsuaki, Okamoto, Chisato, Ono, Go, Ozaki, Masanobu, Saiki, Takanao, Sakatani, Naoya, Senshu, Hiroki, Shimaki, Yuri, Shirai, Kei, Sugita, Seiji, Takei, Yuto, Takeuchi, Hiroshi, Tanaka, Satoshi, Tatsumi, Eri, Terui, Fuyuto, Tsukizaki, Ryudo, Wada, Koji, Yamada, Manabu, Yamada, Tetsuya, Yamamoto, Yukio, Yano, Hajime, Yokota, Yasuhiro, Yoshihara, Keisuke, Yoshikawa, Makoto, Yoshikawa, Kent, Furuya, Shizuho, Hatakeda, Kentaro, Hayashi, Tasuku, Hitomi, Yuya, Kumagai, Kazuya, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Soejima, Hiromichi, Iwamae, Ayako, Yamamoto, Daiki, Yogata, Kasumi, Yoshitake, Miwa, Fukai, Ryota, Usui, Tomohiro, Connolly, Harold C., Lauretta, Dante, Watanabe, Sei-ichiro, and Tsuda, Yuichi

Subjects
Multidisciplinary, Manchester Environmental Research Institute, ResearchInstitutes_Networks_Beacons/MERI
Abstract

The near-Earth carbonaceous asteroid (162173) Ryugu is expected to contain volatile chemical species that could provide information on the origin of Earth's volatiles. Samples of Ryugu were retrieved by the Hayabusa2 spacecraft. We measured noble gas and nitrogen isotopes in Ryugu samples and found that they are dominated by presolar and primordial components, incorporated during Solar System formation. Noble gas concentrations are higher than those in Ivuna-type carbonaceous (CI) chondrite meteorites. Several host phases of isotopically distinct nitrogen have different abundances among the samples. Our measurements support a close relationship between Ryugu and CI chondrites. Noble gases produced by galactic cosmic rays, indicating a ~5 million year exposure, and from implanted solar wind record the recent irradiation history of Ryugu after it migrated to its current orbit. ISSN:0036-8075 ISSN:1095-9203

Published
2023
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29. First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu

Author

Okazaki, Ryuji, primary, Miura, Yayoi N., additional, Takano, Yoshinori, additional, Sawada, Hirotaka, additional, Sakamoto, Kanako, additional, Yada, Toru, additional, Yamada, Keita, additional, Kawagucci, Shinsuke, additional, Matsui, Yohei, additional, Hashizume, Ko, additional, Ishida, Akizumi, additional, Broadley, Michael W., additional, Marty, Bernard, additional, Byrne, David, additional, Füri, Evelyn, additional, Meshik, Alex, additional, Pravdivtseva, Olga, additional, Busemann, Henner, additional, Riebe, My E.I., additional, Gilmour, Jamie, additional, Park, Jisun, additional, Bajo, Ken-ichi, additional, Righter, Kevin, additional, Sakai, Saburo, additional, Sekimoto, Shun, additional, Kitajima, Fumio, additional, Crowther, Sarah A., additional, Iwata, Naoyoshi, additional, Shirai, Naoki, additional, Ebihara, Mitsuru, additional, Yokochi, Reika, additional, Nishiizumi, Kunihiko, additional, Nagao, Keisuke, additional, Lee, Jong Ik, additional, Clay, Patricia, additional, Kano, Akihiro, additional, Caffee, Marc W., additional, Uemura, Ryu, additional, Inagaki, Makoto, additional, Krietsch, Daniela, additional, Maden, Colin, additional, Yamamoto, Mizuki, additional, Fawcett, Lydia, additional, Lawton, Thomas, additional, Nakamura, Tomoki, additional, Naraoka, Hiroshi, additional, Noguchi, Takaaki, additional, Yabuta, Hikaru, additional, Yurimoto, Hisayoshi, additional, Tsuda, Yuichi, additional, Watanabe, Sei-ichiro, additional, Abe, Masanao, additional, Arakawa, Masahiko, additional, Fujii, Atsushi, additional, Hayakawa, Masahiko, additional, Hirata, Naoyuki, additional, Hirata, Naru, additional, Honda, Rie, additional, Honda, Chikatoshi, additional, Hosoda, Satoshi, additional, Iijima, Yu-ichi, additional, Ikeda, Hitoshi, additional, Ishiguro, Masateru, additional, Ishihara, Yoshiaki, additional, Iwata, Takahiro, additional, Kawahara, Kosuke, additional, Kikuchi, Shota, additional, Kitazato, Kohei, additional, Matsumoto, Koji, additional, Matsuoka, Moe, additional, Michikami, Tatsuhiro, additional, Mimasu, Yuya, additional, Miura, Akira, additional, Morota, Tomokatsu, additional, Nakazawa, Satoru, additional, Namiki, Noriyuki, additional, Noda, Hirotomo, additional, Noguchi, Rina, additional, Ogawa, Naoko, additional, Ogawa, Kazunori, additional, Okada, Tatsuaki, additional, Okamoto, Chisato, additional, Ono, Go, additional, Ozaki, Masanobu, additional, Saiki, Takanao, additional, Sakatani, Naoya, additional, Senshu, Hiroki, additional, Shimaki, Yuri, additional, Shirai, Kei, additional, Sugita, Seiji, additional, Takei, Yuto, additional, Takeuchi, Hiroshi, additional, Tanaka, Satoshi, additional, Tatsumi, Eri, additional, Terui, Fuyuto, additional, Tsukizaki, Ryudo, additional, Wada, Koji, additional, Yamada, Manabu, additional, Yamada, Tetsuya, additional, Yamamoto, Yukio, additional, Yano, Hajime, additional, Yokota, Yasuhiro, additional, Yoshihara, Keisuke, additional, Yoshikawa, Makoto, additional, Yoshikawa, Kent, additional, Furuya, Shizuho, additional, Hatakeda, Kentaro, additional, Hayashi, Tasuku, additional, Hitomi, Yuya, additional, Kumagai, Kazuya, additional, Miyazaki, Akiko, additional, Nakato, Aiko, additional, Nishimura, Masahiro, additional, Soejima, Hiromichi, additional, Iwamae, Ayako, additional, Yamamoto, Daiki, additional, Yogata, Kasumi, additional, Yoshitake, Miwa, additional, Fukai, Ryota, additional, Usui, Tomohiro, additional, Ireland, Trevor, additional, Connolly, Harold C., additional, Lauretta, Dante S., additional, and Tachibana, Shogo, additional

Published
2022
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30. Characterization of the MASCOT landing area by Hayabusa2

Author

Schröder, Stefan, primary, Sakatani, Naoya, additional, Honda, Rie, additional, Tatsumi, Eri, additional, Yokota, Yasuhiro, additional, Domingue, Deborah, additional, Cho, Yuichiro, additional, Kameda, Shingo, additional, Kitazato, Kohei, additional, Kouyama, Toru, additional, Matsuoka, Moe, additional, Miura, Akira, additional, Morota, Tomokatsu, additional, Okada, Tatsuaki, additional, Sawada, Hirotaka, additional, Senshu, Hiroki, additional, Shimaki, Yuri, additional, Sugita, Seiji, additional, Tanaka, Satoshi, additional, Yabuta, Hikaru, additional, Yamada, Manabu, additional, Grott, Matthias, additional, Hamm, Maximilian, additional, Ho, Tra-Mi, additional, Jaumann, Ralf, additional, Mottola, Stefano, additional, Otto, Katharina, additional, Schmitz, Nicole, additional, and Scholten, Frank, additional

Published
2022
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31. High Speed Flyby Imaging of Cometary Nucleus by Comet Interceptor Mission

Author

SAKATANI, Naoya, KAMEDA, Shingo, OZAKI, Naoya, and SASAKI, Takahiro

Abstract

第32回アストロダイナミクスシンポジウム (2022年7月25-26日. ハイブリッド開催（JAXA相模原キャンパス& オンライン)), The 32th Workshop on JAXA Astrodynamics and Flight Mechanics 2022 (July 25-26, 2022. Hybrid(in-person & online) Conference (Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), 資料番号: SA6000181042, レポート番号: ASTRO-2022-B016

Published
2022

32. On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective

Author

NAKAMURA, Eizo, primary, KOBAYASHI, Katsura, additional, TANAKA, Ryoji, additional, KUNIHIRO, Tak, additional, KITAGAWA, Hiroshi, additional, POTISZIL, Christian, additional, OTA, Tsutomu, additional, SAKAGUCHI, Chie, additional, YAMANAKA, Masahiro, additional, RATNAYAKE, Dilan M., additional, TRIPATHI, Havishk, additional, KUMAR, Rahul, additional, AVRAMESCU, Maya-Liliana, additional, TSUCHIDA, Hidehisa, additional, YACHI, Yusuke, additional, MIURA, Hitoshi, additional, ABE, Masanao, additional, FUKAI, Ryota, additional, FURUYA, Shizuho, additional, HATAKEDA, Kentaro, additional, HAYASHI, Tasuku, additional, HITOMI, Yuya, additional, KUMAGAI, Kazuya, additional, MIYAZAKI, Akiko, additional, NAKATO, Aiko, additional, NISHIMURA, Masahiro, additional, OKADA, Tatsuaki, additional, SOEJIMA, Hiromichi, additional, SUGITA, Seiji, additional, SUZUKI, Ayako, additional, USUI, Tomohiro, additional, YADA, Toru, additional, YAMAMOTO, Daiki, additional, YOGATA, Kasumi, additional, YOSHITAKE, Miwa, additional, ARAKAWA, Masahiko, additional, FUJII, Atsushi, additional, HAYAKAWA, Masahiko, additional, HIRATA, Naoyuki, additional, HIRATA, Naru, additional, HONDA, Rie, additional, HONDA, Chikatoshi, additional, HOSODA, Satoshi, additional, IIJIMA, Yu-ichi, additional, IKEDA, Hitoshi, additional, ISHIGURO, Masateru, additional, ISHIHARA, Yoshiaki, additional, IWATA, Takahiro, additional, KAWAHARA, Kosuke, additional, KIKUCHI, Shota, additional, KITAZATO, Kohei, additional, MATSUMOTO, Koji, additional, MATSUOKA, Moe, additional, MICHIKAMI, Tatsuhiro, additional, MIMASU, Yuya, additional, MIURA, Akira, additional, MOROTA, Tomokatsu, additional, NAKAZAWA, Satoru, additional, NAMIKI, Noriyuki, additional, NODA, Hirotomo, additional, NOGUCHI, Rina, additional, OGAWA, Naoko, additional, OGAWA, Kazunori, additional, OKAMOTO, Chisato, additional, ONO, Go, additional, OZAKI, Masanobu, additional, SAIKI, Takanao, additional, SAKATANI, Naoya, additional, SAWADA, Hirotaka, additional, SENSHU, Hiroki, additional, SHIMAKI, Yuri, additional, SHIRAI, Kei, additional, TAKEI, Yuto, additional, TAKEUCHI, Hiroshi, additional, TANAKA, Satoshi, additional, TATSUMI, Eri, additional, TERUI, Fuyuto, additional, TSUKIZAKI, Ryudo, additional, WADA, Koji, additional, YAMADA, Manabu, additional, YAMADA, Tetsuya, additional, YAMAMOTO, Yukio, additional, YANO, Hajime, additional, YOKOTA, Yasuhiro, additional, YOSHIHARA, Keisuke, additional, YOSHIKAWA, Makoto, additional, YOSHIKAWA, Kent, additional, FUJIMOTO, Masaki, additional, WATANABE, Sei-ichiro, additional, and TSUDA, Yuichi, additional

Published
2022
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33. First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu

Author

00898455, Okazaki, Ryuji, Miura, Yayoi N., Takano, Yoshinori, Sawada, Hirotaka, Sakamoto, Kanako, Yada, Toru, Yamada, Keita, Kawagucci, Shinsuke, Matsui, Yohei, Hashizume, Ko, Ishida, Akizumi, Broadley, Michael W., Marty, Bernard, Byrne, David, Füri, Evelyn, Meshik, Alex, Pravdivtseva, Olga, Busemann, Henner, Riebe, My E.I., Gilmour, Jamie, Park, Jisun, Bajo, Ken-ichi, Righter, Kevin, Sakai, Saburo, Sekimoto, Shun, Kitajima, Fumio, Crowther, Sarah A., Iwata, Naoyoshi, Shirai, Naoki, Ebihara, Mitsuru, Yokochi, Reika, Nishiizumi, Kunihiko, Nagao, Keisuke, Lee, Jong Ik, Clay, Patricia, Kano, Akihiro, Caffee, Marc W., Uemura, Ryu, Inagaki, Makoto, Krietsch, Daniela, Maden, Colin, Yamamoto, Mizuki, Fawcett, Lydia, Lawton, Thomas, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Yabuta, Hikaru, Yurimoto, Hisayoshi, Tsuda, Yuichi, Watanabe, Sei-ichiro, Abe, Masanao, Arakawa, Masahiko, Fujii, Atsushi, Hayakawa, Masahiko, Hirata, Naoyuki, Hirata, Naru, Honda, Rie, Honda, Chikatoshi, Hosoda, Satoshi, Iijima, Yu-ichi, Ikeda, Hitoshi, Ishiguro, Masateru, Ishihara, Yoshiaki, Iwata, Takahiro, Kawahara, Kosuke, Kikuchi, Shota, Kitazato, Kohei, Matsumoto, Koji, Matsuoka, Moe, Michikami, Tatsuhiro, Mimasu, Yuya, Miura, Akira, Morota, Tomokatsu, Nakazawa, Satoru, Namiki, Noriyuki, Noda, Hirotomo, Noguchi, Rina, Ogawa, Naoko, Ogawa, Kazunori, Okada, Tatsuaki, Okamoto, Chisato, Ono, Go, Ozaki, Masanobu, Saiki, Takanao, Sakatani, Naoya, Senshu, Hiroki, Shimaki, Yuri, Shirai, Kei, Sugita, Seiji, Takei, Yuto, Takeuchi, Hiroshi, Tanaka, Satoshi, Tatsumi, Eri, Terui, Fuyuto, Tsukizaki, Ryudo, Wada, Koji, Yamada, Manabu, Yamada, Tetsuya, Yamamoto, Yukio, Yano, Hajime, Yokota, Yasuhiro, Yoshihara, Keisuke, Yoshikawa, Makoto, Yoshikawa, Kent, Furuya, Shizuho, Hatakeda, Kentaro, Hayashi, Tasuku, Hitomi, Yuya, Kumagai, Kazuya, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Soejima, Hiromichi, Iwamae, Ayako, Yamamoto, Daiki, Yogata, Kasumi, Yoshitake, Miwa, Fukai, Ryota, Usui, Tomohiro, Ireland, Trevor, Connolly, Harold C., Lauretta, Dante S., Tachibana, Shogo, 00898455, Okazaki, Ryuji, Miura, Yayoi N., Takano, Yoshinori, Sawada, Hirotaka, Sakamoto, Kanako, Yada, Toru, Yamada, Keita, Kawagucci, Shinsuke, Matsui, Yohei, Hashizume, Ko, Ishida, Akizumi, Broadley, Michael W., Marty, Bernard, Byrne, David, Füri, Evelyn, Meshik, Alex, Pravdivtseva, Olga, Busemann, Henner, Riebe, My E.I., Gilmour, Jamie, Park, Jisun, Bajo, Ken-ichi, Righter, Kevin, Sakai, Saburo, Sekimoto, Shun, Kitajima, Fumio, Crowther, Sarah A., Iwata, Naoyoshi, Shirai, Naoki, Ebihara, Mitsuru, Yokochi, Reika, Nishiizumi, Kunihiko, Nagao, Keisuke, Lee, Jong Ik, Clay, Patricia, Kano, Akihiro, Caffee, Marc W., Uemura, Ryu, Inagaki, Makoto, Krietsch, Daniela, Maden, Colin, Yamamoto, Mizuki, Fawcett, Lydia, Lawton, Thomas, Nakamura, Tomoki, Naraoka, Hiroshi, Noguchi, Takaaki, Yabuta, Hikaru, Yurimoto, Hisayoshi, Tsuda, Yuichi, Watanabe, Sei-ichiro, Abe, Masanao, Arakawa, Masahiko, Fujii, Atsushi, Hayakawa, Masahiko, Hirata, Naoyuki, Hirata, Naru, Honda, Rie, Honda, Chikatoshi, Hosoda, Satoshi, Iijima, Yu-ichi, Ikeda, Hitoshi, Ishiguro, Masateru, Ishihara, Yoshiaki, Iwata, Takahiro, Kawahara, Kosuke, Kikuchi, Shota, Kitazato, Kohei, Matsumoto, Koji, Matsuoka, Moe, Michikami, Tatsuhiro, Mimasu, Yuya, Miura, Akira, Morota, Tomokatsu, Nakazawa, Satoru, Namiki, Noriyuki, Noda, Hirotomo, Noguchi, Rina, Ogawa, Naoko, Ogawa, Kazunori, Okada, Tatsuaki, Okamoto, Chisato, Ono, Go, Ozaki, Masanobu, Saiki, Takanao, Sakatani, Naoya, Senshu, Hiroki, Shimaki, Yuri, Shirai, Kei, Sugita, Seiji, Takei, Yuto, Takeuchi, Hiroshi, Tanaka, Satoshi, Tatsumi, Eri, Terui, Fuyuto, Tsukizaki, Ryudo, Wada, Koji, Yamada, Manabu, Yamada, Tetsuya, Yamamoto, Yukio, Yano, Hajime, Yokota, Yasuhiro, Yoshihara, Keisuke, Yoshikawa, Makoto, Yoshikawa, Kent, Furuya, Shizuho, Hatakeda, Kentaro, Hayashi, Tasuku, Hitomi, Yuya, Kumagai, Kazuya, Miyazaki, Akiko, Nakato, Aiko, Nishimura, Masahiro, Soejima, Hiromichi, Iwamae, Ayako, Yamamoto, Daiki, Yogata, Kasumi, Yoshitake, Miwa, Fukai, Ryota, Usui, Tomohiro, Ireland, Trevor, Connolly, Harold C., Lauretta, Dante S., and Tachibana, Shogo

Abstract

The Hayabusa2 spacecraft returned to Earth from the asteroid 162173 Ryugu on 6 December 2020. One day after the recovery, the gas species retained in the sample container were extracted and measured on-site and stored in gas collection bottles. The container gas consists of helium and neon with an extraterrestrial ³He/⁴He and ²⁰Ne/²²Ne ratios, along with some contaminant terrestrial atmospheric gases. A mixture of solar and Earth’s atmospheric gas is the best explanation for the container gas composition. Fragmentation of Ryugu grains within the sample container is discussed on the basis of the estimated amount of indigenous He and the size distribution of the recovered Ryugu grains. This is the first successful return of gas species from a near-Earth asteroid.

Published
2022

34. Characterization of the MASCOT landing area by Hayabusa2

Author

Schröder, Stefanus, Sakatani, Naoya, Honda, Rie, Tatsumi, Eri, Yokota, Yasuhiro, Domingue, Deborah, Cho, Yuichiro, Kameda, Shingo, Kitazato, Kohei, Kouyama, Toru, Matsuoka, Moe, Miura, Akira, Morota, Tomokatsu, Okada, Tatsuaki, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Sugita, Seiji, Tanaka, Satoshi, Yabuta, Hikaru, Yamada, Manabu, Grott, Matthias, Hamm, Maximilian, Ho, Tra-Mi, Jaumann, Ralf, Mottola, Stefano, Otto, Katharina, Schmitz, Nicole, Scholten, Frank, Schröder, Stefanus, Sakatani, Naoya, Honda, Rie, Tatsumi, Eri, Yokota, Yasuhiro, Domingue, Deborah, Cho, Yuichiro, Kameda, Shingo, Kitazato, Kohei, Kouyama, Toru, Matsuoka, Moe, Miura, Akira, Morota, Tomokatsu, Okada, Tatsuaki, Sawada, Hirotaka, Senshu, Hiroki, Shimaki, Yuri, Sugita, Seiji, Tanaka, Satoshi, Yabuta, Hikaru, Yamada, Manabu, Grott, Matthias, Hamm, Maximilian, Ho, Tra-Mi, Jaumann, Ralf, Mottola, Stefano, Otto, Katharina, Schmitz, Nicole, and Scholten, Frank

Abstract

Context. After landing on C-type asteroid Ryugu, MASCOT imaged brightly colored, submillimeter-sized inclusions in a small rock. Hayabusa2 successfully returned a sample of small particles from the surface of Ryugu, but none of these appear to harbor such inclusions. The samples are considered representative of Ryugu.Aims. To understand the apparent discrepancy between MASCOT observations and Ryugu samples, we assess whether the MASCOT landing site, and the rock by implication, is perhaps atypical for Ryugu. Methods. We analyzed observations of the MASCOT landing area acquired by three instruments on board Hayabusa2: a camera (ONC), a nearinfrared spectrometer (NIRS3), and a thermal infrared imager (TIR). We compared the landing area properties thus retrieved with those of theaverage Ryugu surface. Results. We selected several areas and landforms in the landing area for analysis: a small crater, a collection of smooth rocks, and the landing site itself. The crater is relatively blue and the rocks are relatively red. The spectral and thermophysical properties of the landing site are very closeto those of the average Ryugu surface. The spectral properties of the MASCOT rock are probably close to average, but its thermal inertia may besomewhat higher. Conclusions. The MASCOT rock can also be considered representative of Ryugu. Some of the submillimeter-sized particles in the returned samples stand out because of their atypical spectral properties. Such particles may be present as inclusions in the MASCOT rock., Validerad;2022;Nivå 2;2022-11-10 (hanlid);Funder: JSPS International Planetary Network

Published
2022
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35. Full-field modeling of heat transfer in asteroid regolith 2: Effects of porosity

Author

Ryan, Andrew J., Pino-Muñoz, Daniel, Bernacki, Marc, Delbo, Marco, Sakatani, Naoya, Biele, Jens, Emery, Joshua P., Rozitis, Benjamin, Ryan, Andrew J., Pino-Muñoz, Daniel, Bernacki, Marc, Delbo, Marco, Sakatani, Naoya, Biele, Jens, Emery, Joshua P., and Rozitis, Benjamin

Abstract

The thermal conductivity of granular planetary regolith is strongly dependent on the porosity, or packing density, of the regolith particles. However, existing models for regolith thermal conductivity predict different dependencies on porosity. Here, we use a full-field model of planetary regolith to study the relationship between regolith radiative thermal conductivity, porosity, and the particle non-isothermality. The model approximates regolith as regular and random packings of spherical particles in a 3D finite element mesh framework. Our model results, which are in good agreement with previous numerical and experimental datasets, show that random packings have a consistently higher radiative thermal conductivity than ordered packings. From our random packing results, we present a new empirical model relating regolith thermal conductivity, porosity, temperature, particle size, and the thermal conductivity of individual particles. This model shows that regolith particle size predictions from thermal inertia are largely independent of assumptions of regolith porosity, except for when the non-isothermality effect is large, as is the case when the regolith is particularly coarse and/or is composed of low thermal conductivity material.

Published
2022

36. A Study on Methods of Generating Locally Resolution Enhanced Asteroid Shape Models

Author

Miura, Akira, Sakatani, Naoya, Yokota, Yasuhiro, and Honda, Rie

Subjects
Shape Model Generation, Asteroid
Abstract

2014年12月に打ち上げられた小惑星探査機「はやぶさ2」は, 2018年の夏に小惑星リュウグウ(162173, 1999 JU3)の探査を開始した. 「はやぶさ2」の小惑星リュウグウへの接近運用に際しては, それらの運用が適切に実施できるように, 実際の観測や係る運用に先立って, 小惑星の局所的な形状模擬や撮像模擬等が必要とされた. 本稿においては, このような要素を実現するための, 小惑星形状モデルの生成手法や可視化時の再分割手法について述べる. 本手法はリュウグウに止まらず, 類似の天体への応用も期待されるものである., The Hayabusa 2 asteroid explorer was launched in December 2014 and began to explore Ryugu (162173, 1999 JU3) in the summer of 2018. During the proximity operations around Ryugu, in order that each operation may be executed properly, it is required to simulate the local shapes of the asteroid and images of on-board cameras in advance. In this paper, we describe several methods of generating shape models of asteroids and a subdivision method during rendering. These methods are expected to be utilized in the case of other celestial objects., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA1930025004, レポート番号: JAXA-RR-19-006

Published
2020

37. 小惑星探査画像データの閲覧・検索システムJADE: JAXA Asteroid Data Explorer

Author

KIKUCHI, Hiroshi, YAMAMOTO, Mitsuo, YOKOTA, Yasuhiro, SATO, Hiroyuki, OTAKE, Hisashi, HONDA, Rie, SUGITA, Seiji, MOROTA, Tomokatsu, ISHIKAWA, Toru, KONISHI, Takeshi, IMAKI, Kazuya, WATABE, Yasuyuki, HEMMI, Ryodo, MIYAMOTO, Hideaki, YAMAMOTO, Yukio, HIRATA, Naru, HIRATA, Naoyuki, SASAKI, Sho, KOMATSU, Goro, DEMURA, Hirohide, HONDA, Chikatoshi, YAMADA, Manabu, KAMEDA, Shingo, TATSUMI, Eri, MURAKAMI, Shin-ya, CHO, Yuichiro, YOSHIKAWA, Kazuo, SAWADA, Hirotaka, SAKATANI, Naoya, HAYAKAWA, Masahiko, MATSUOKA, Moe, KOUYAMA, Toru, SUZUKI, Hidehiko, and OAGAWA, Kazunori

Abstract

2021年度宇宙科学情報解析シンポジウム(2022年2月18日. オンライン開催), Space Science Informatics Symposium FY2021(February 18, 2022. Online Meeting), 著者人数: 34名, 資料番号: SA6000169014

Published
2022

38. Opposition Observations of 162173 Ryugu: Normal Albedo Map Highlights Variations in Regolith Characteristics

Author

Yokota, Yasuhiro, primary, Honda, Rie, additional, Tatsumi, Eri, additional, Domingue, Deborah, additional, Schröder, Stefan, additional, Matsuoka, Moe, additional, Morota, Tomokatsu, additional, Sakatani, Naoya, additional, Kameda, Shingo, additional, Kouyama, Toru, additional, Yamada, Manabu, additional, Honda, Chikatoshi, additional, Hayakawa, Masahiko, additional, Cho, Yuichiro, additional, Michikami, Tatsuhiro, additional, Suzuki, Hidehiko, additional, Yoshioka, Kazuo, additional, Sawada, Hirotaka, additional, Ogawa, Kazunori, additional, Yumoto, Kouki, additional, and Sugita, Seiji, additional

Published
2021
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39. Boulder size and shape distributions on asteroid Ryugu

Author

Hagermann, Axel, Ernst, Carolyn M., Kawamura, Masaki, Sugimoto, Kiichi, Noguchi, Takaaki, Noguchi, Rina, Hemmi, Ryodo, Kikuch, Hiroshi, Michikami, Tatsuhiro, Honda, Chikatoshi, Miyamoto, Hideaki, Hirabayashi, Masatoshi, Irie, Terunori, Nomura, Keita, Tatsumi, Eri, Morota, Tomokatsu, Hirata, Naru, Cho, Yuichiro, Kameda, Shingo, Kouyama, Toru, Yokota, Yasuhiro, Hayakawa, Masahiko, Hirata, Naoyuki, Honda, Rie, Matsuoka, Moe, Sakatani, Naoya, Suzuki, Hidehiko, Yamada, Manabu, Yoshioka, Kazuo, Sawada, Hirotaka, Ogawa, Kazunori, Watanabe, Sei-ichiro, Tanaka, Satoshi, Yoshikawa, Makoto, Tsuda, Yuichi, and Sugita, Seiji

Subjects
Number density, 010504 meteorology & atmospheric sciences, Impact processes, Equator, Astronomy and Astrophysics, 01 natural sciences, Regolith, Parent body, Asteroids, Latitude, Optical navigation, Surfaces, Impact crater, Space and Planetary Science, Asteroid, 0103 physical sciences, Geological processes, Asteroid Ryugu, Regoliths, 010303 astronomy & astrophysics, Geomorphology, Geology, 0105 earth and related environmental sciences
Abstract

著者人数: 36名, Accepted: 2019-05-17, 資料番号: SA1190100000

Published
2019

40. Remote Boulder counting and thermal IR temperature curves constrain strength, microporosity, thermal conductivity and grain density of rubble pile Ryugu's rock

Author

Biele, Jens, Grott, Matthias, Hamm, Maximilian, Michel, Patrick, Sugita, Seiji, Sakatani, Naoya, Neumann, Wladimir, Kameda, Shingo, Michikami, Tatsuhiro, and Honda, Chikatoshi

Subjects
Planetenphysik, Ryugu, microporosity, IR temperature, Nutzerzentrum für Weltraumexperimente (MUSC)
Abstract

In this paper, we summarize the findings and deductions for small asteroid Ryugu from Hayabusa2 remote sensing as well as from MASCOT radiometer (MARA) data. Observations cover the VIS (broadband) and MIR (broadband) wavelength ranges. For a typical rock on Ryugu's surface, we find a thermal inertia of 295±18 Jm-2K-1s-1/2 (Hamm+ 2020), a microporosity of 50 ± 3% (Grott+ 2020, Hamm+, 2020), and assuming a CM composition and thus an inferred specific heat capacity of cp = 890 Jkg-1K-1 (± 10%, at an average temperature of 277 K), we estimate a thermal conductivity of 0.069 ± 0.012 Jm-1K-1 at ~277 K. These estimates are based on MARA surface brightness temperature measurements of an arguably (Biele+ 2019) dust-free boulder at MASCOT's landing site obtained over a full diurnal cycle. Those values are consistent with the TIR instrument's global findings (Okada+ 2020). The main source of uncertainty in the thermal inertia estimate is due to the uncertain surface orientation of the boulder top that determines the insolation power. Including a Digital Terrain Model (DTM) of the observed boulder, embedded in the MASCOT landing site (Scholten+, 2019), into the thermal model could reduce this uncertainty significantly. The very high deduced microporosity lets us reasonably estimate the tensile strength of those abundant "cauliflower rocks" (Jaumann+, 2019), ~200-280 kPa (Grott+, 2019).

Published
2021

41. Impact Flash Study: Relationships between Target Physical Properties and Impact Flash Mechanism

Author

FUSE, Ryota, ABE, Shinsuke, YANAGISAWA, Masahisa, FUKUHARA, Tetsuya, SAKATANI, Naoya, and HASEGAWA, Sunao

Abstract

令和2年度宇宙科学に関する室内実験シンポジウム（2021年3月5日. オンライン開催), 2021 Symposium on Laboratory Experiment for Space Science (March 5, 2021. Online Meeting), PDF再処理の為、2023年3月7日に差替, 資料番号: SA6000161036, レポート番号: 36

Published
2021

42. Science and development of the thermal imager TIRI on the ESA Hera mission

Author

Hera TIRIチーム, OKADA, Tatsuaki, TANAKA, Satoshi, FUKUHARA, Tetsuya, SAKATANI, Naoya, SHIMAKI, Yuri, SENSHU, Hiroki, ARAI, Takehiko, DEMURA, Hirohide, KOUYAMA, Toru, SEKIGUCHI, Tomohiko, and Hera TIRI Team

Abstract

第21回宇宙科学シンポジウム (2021年1月6日-7日. オンライン開催), 21st Space Science Symposium (January 6-7, 2021. Online Meeting), 資料番号: SA6000163177, レポート番号: Pb.03

Published
2021

43. Current status of development of TENGOO/OROCHI onboard MMX

Author

KAMEDA, Shingo, OAZAKI, Masanobu, ENYA, Keigo, KOUYAMA, Toru, FUSE, Ryota, SUZUKI, Hidehiko, MIYAMOTO, Hideaki, YAMAZAKI, Atsushi, GODA, Yuya, FUJISHIMA, Saori, AOYAMA, Tsubasa, and SAKATANI, Naoya

Abstract

第21回宇宙科学シンポジウム (2021年1月6日-7日. オンライン開催), 21st Space Science Symposium (January 6-7, 2021. Online Meeting), 資料番号: SA6000163092, レポート番号: g10-8

Published
2021

45. Scientific Objectives of Small Carry-on Impactor (SCI) and Deployable Camera 3 Digital (DCAM3-D): Observation of an Ejecta Curtain and a Crater Formed on the Surface of Ryugu by an Artificial High-Velocity Impact

Author

Michel, P., Jutzi, M., Arakawa, Masahiko, Wada, Koji, Saiki, Takanao, Kadono, Toshihiko, Takagi, Yasuhiko, Shirai, Kei, Okamoto, Chisato, Yano, Hajime, Hayakawa, Masahiko, Nakazawa, Satoru, Hirata, Naru, Kobayashi, Masanori, Imamura, Hiroshi, Ogawa, Kazunori, Sakatani, Naoya, Iijima, Yuichi, Honda, Rie, Ishibashi, Ko, Hayakawa, Hajime, and Sawada, Hirotaka

Subjects
Surface (mathematics), 010504 meteorology & atmospheric sciences, Ejecta curtain, 530 Physics, High velocity, 520 Astronomy, Asteroid, Astronomy and Astrophysics, Impact crater, 620 Engineering, 01 natural sciences, Space weathering, Astrobiology, Planetary science, Space and Planetary Science, 0103 physical sciences, Thermal, Crater scaling laws, Microgravity, Ejecta, 010303 astronomy & astrophysics, Geology, 0105 earth and related environmental sciences
Abstract

著者人数: 22名, Accepted: 2016-09-08, 資料番号: SA1160286000

Published
2017
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46. The Western Bulge of 162173 Ryugu Formed as a Result of a Rotationally Driven Deformation Process

Author

Scheeres, Daniel J., Barnouin, Olivier S., Michel, Patrick, Schwartz, Stephen R., Hirabayashi, Masatoshi, Tatsumi, Eri, Miyamoto, Hideaki, Komatsu, Goro, Sugita, Seiji, Watanabe, Sei-ichiro, Honda, Chikatoshi, Michikami, Tatsuhiro, Cho, Yuichiro, Morota, Tomokatsu, Hirata, Naru, Hirata, Naoyuki, Sakatani, Naoya, Honda, Rie, Yokota, Yasuhiro, Kameda, Shingo, Suzuki, Hidehiko, Kouyama, Toru, Hayakawa, Masahiko, Matsuoka, Moe, Yoshioka, Kazuo, Ogawa, Kazunori, Sawada, Hirotaka, Yoshikawa, Makoto, Tsuda, Yuichi, Department of Earth and Planetary Sciences [TITECH Tokyo], Tokyo Institute of Technology [Tokyo] (TITECH), Dept of Complex Science and Engineering, Graduate School of Frontier Science, The University of Tokyo (UTokyo), Flight Dynamics and Control (University of Michigan), University of Michigan [Ann Arbor], University of Michigan System-University of Michigan System, Johns Hopkins University Applied Physics Laboratory [Laurel, MD] (APL), Joseph Louis LAGRANGE (LAGRANGE), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Graduate School of Science [Sendai], Tohoku University [Sendai], Department of Earth and Planetary Science [Tokyo], ANR-15-IDEX-0001,UCA JEDI,Idex UCA JEDI(2015), Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency [Sagamihara] (JAXA), Graduate School of Science [Tokyo], and The University of Tokyo (UTokyo)-The University of Tokyo (UTokyo)

Subjects
Earth and Planetary Astrophysics (astro-ph.EP), Centrifugal force, Physics, 010504 meteorology & atmospheric sciences, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], FOS: Physical sciences, Astronomy and Astrophysics, Geometry, Deformation (meteorology), Ridge (differential geometry), 01 natural sciences, Finite element method, Space and Planetary Science, Asteroid, Bulge, 0103 physical sciences, minor planets, asteroids: individual (162173 Ryugu), 010303 astronomy & astrophysics, Spin (aerodynamics), Spinning, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Astrophysics - Earth and Planetary Astrophysics
Abstract

著者人数: 29名, Accepted: 2019-03-11, 資料番号: SA1180406000

Published
2019
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47. 小惑星モデルについての検討 ―局所的詳細化及び係るレンダリング手法―

Author

Miura, Akira, Sakatani, Naoya, Yokota, Yasuhiro, and Honda, Rie

Abstract

平成30年度宇宙科学情報解析シンポジウム（2019年2月15日. 宇宙航空研究開発機構宇宙科学研究所（JAXA)(ISAS)）, 相模原市, 神奈川県, Space Science Informatics Symposium FY2018 (February 15, 2019. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan, 資料番号: SA6000133007

Published
2019

48. Thermal inertia of asteroid Ryugu using dawn-side thermal images by TIR on Hayabusa2

Author

Okada, T., Fukuhara, Tetsuya, Tanaka, Satoshi, Taguchi, Makoto, Arai, Takehiko, Sakatani, Naoya, Shimaki, Yuri, Senshu, Hiroki, Demura, Hirohide, Ogawa, Yoshiko, Suko, Kentaro, Sekiguchi, Tomohiko, Kouyama, Toru, Helbert, Jörn, Müller, T., Hagermann, Axel, Biele, Jens, Grott, Matthias, Hamm, Maximilian, and Delbo, Marco

Subjects
TIR, asteroid, Planetenphysik, Physics::Space Physics, Leitungsbereich PF, thermal images, Ryugu, Astrophysics::Earth and Planetary Astrophysics, Thermal inertia, Hayabusa2, Nutzerzentrum für Weltraumexperimente (MUSC)
Abstract

A thermal inertia map of the C-type Near-Earth asteroid 162173 Ryugu has been derived using the one-rotation global thermal image sets observed from the Home Position at 20 km altitude [1]. This time the thermal images of the night side areas of the surface just before sunrise were taken during observations from the dawn side. The coldest brightness temperature of the surface indicates another information on the thermal inertia of the surface. The thermal inertia is preliminary estimated at 250 [J m-2K-1s-0.5] or lower, which is consistent with other than those derived from the daytime observations [2].

Published
2019

49. MMXミッションの着陸オペレーションに関する検討

Author

MMX着地運用ワーキングチーム, Miyamoto, Hideaki, Imada, Takane, Otsuki, Masatsugu, Ogawa, Kazunori, Kameda, Shingo, Baba, Mitsuhisa, Kikuchi, Hiroshi, Sakatani, Naoya, Hemmi, Ryodo, Kato, Hiroki, Nakamura, Tomoki, Niihara, Takafumi, and Wada, Koji

Abstract

第19回宇宙科学シンポジウム (2019年1月9日-10日. 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS)相模原キャンパス), 相模原市, 神奈川県, 19th Space Science Symposium (January 9-10, 2019. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency(JAXA)(ISAS)Sagamihara Campus), Sagamihara, Kanagawa Japan, 著者人数: 13名ほか, 資料番号: SA6000144135, レポート番号: P-100

Published
2019

50. Multivariable statistical analysis of spectrophotometry and spectra of (162173) Ryugu as observed by JAXA Hayabusa2 mission

Author

Barucci, M. A., Hasselmann, P. H., Fulchignoni, M., Deshapriya, J. D. P., Perna, D., Domingue, D., Matsuura, S., Hiroi, T., Nakamura, T., Takir, D., Vilas, F., Hirata, N., Honda, Rie, Yokota, Yasuhiro, Sugita, Seiji, Kitazato, Kohei, Tatsumi, Eri, Morota, Tomokatsu, Kameda, Shingo, Iwata, Takahiro, Abe, Masanao, Ohtake, Makiko, Matsuoka, Moe, Kouyama, Toru, Suzuki, Hidehiko, Yamada, Manabu, Sakatani, Naoya, Honda, Chikatoshi, Ogawa, Kazunori, Hayakawa, Masahiko, Yoshioka, Kazuo, Cho, Yuichiro, Sawada, Hirotaka, Tanaka, Satoshi, Yamamoto, Yukio, Yoshikawa, Makoto, Watanabe, Sei-ichiro, Tsuda, Yuichi, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010504 meteorology & atmospheric sciences, Context (language use), Astrophysics, 01 natural sciences, Space weathering, Spectral line, minor planets, asteroids: individual: RYUGU, minor planets asteroids: individual: RYUGU, techniques: photometric, Spectrophotometry, 0103 physical sciences, Spectral slope, medicine, 14. Life underwater, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, Physics, methods: statistical, medicine.diagnostic_test, Mode (statistics), Astronomy and Astrophysics, Regolith, Space and Planetary Science, Asteroid, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], techniques: spectroscopic
Abstract

著者人数: 39名, Accepted: 2019-07-04, 資料番号: SA1190099000

Published
2019
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