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View article: Study on the possibility of comet observation using ONC-W2 camera during the cruising phase of Hayabusa2
Study on the possibility of comet observation using ONC-W2 camera during the cruising phase of Hayabusa2 Open
++ 1. IntroductionThe Hayabusa2 spacecraft is currently cruising through deep space for the extended mission Hayabusa2#. The spacecraft is scheduled to flyby asteroid 2002 CC21 in 2026 and rendezvous with asteroid 1998 KY26 in 2031. Hayabu…
View article: Simultaneous geometric calibration and orbit-attitude determination of Hayabusa2’s deployable camera (DCAM3)
Simultaneous geometric calibration and orbit-attitude determination of Hayabusa2’s deployable camera (DCAM3) Open
Hayabusa2's deployable camera (DCAM3) was deployed from the spacecraft near the asteroid Ryugu to successfully monitor the artificial cratering experiment. Scientific analyses of the observed impact ejecta require accurate determination of…
EP169/#411 Machine learning method for differential diagnosis and prognosis prediction for early-stage uterine sarcoma using preoperative blood biomarker and age Open
Introduction Preoperative differential diagnosis of clinical stage I uterine sarcoma (US) is essential for surgical intervention. Many studies have been done using CT or MRI imaging for machine learning prediction models but not with blood…
View article: Comparison of optical spectra between asteroids Ryugu and Bennu:I. Cross calibration between Hayabusa2/ONC-T and OSIRIS-REx/MapCam
Comparison of optical spectra between asteroids Ryugu and Bennu:I. Cross calibration between Hayabusa2/ONC-T and OSIRIS-REx/MapCam Open
Asteroids (162173) Ryugu and (101955) Bennu observed by Hayabusa2 and OSIRIS-REx share many properties, but spectral observations by the telescopic Optical Navigation Camera (ONC-T) and MapCam detected subtle but significant differences, w…
View article: Initial Result of Heliocentric Distance Dependence of Zodiacal Light Observed by Hayabusa2#
Initial Result of Heliocentric Distance Dependence of Zodiacal Light Observed by Hayabusa2# Open
The zodiacal light (ZL) is sunlight scattered by interplanetary dust (IPD) in the optical wavelengths. The spatial distribution of IPD in the Solar system may hold an important key to understanding the evolution of the Solar system and mat…
View article: Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu
Soluble organic molecules in samples of the carbonaceous asteroid (162173) Ryugu Open
The Hayabusa2 spacecraft collected samples from the surface of the carbonaceous near-Earth asteroid (162173) Ryugu and brought them to Earth. The samples were expected to contain organic molecules, which record processes that occurred in t…
View article: Macromolecular organic matter in samples of the asteroid (162173) Ryugu
Macromolecular organic matter in samples of the asteroid (162173) Ryugu Open
Samples of the carbonaceous asteroid (162173) Ryugu were collected and brought to Earth by the Hayabusa2 spacecraft. We investigated the macromolecular organic matter in Ryugu samples and found that it contains aromatic and aliphatic carbo…
View article: A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu
A dehydrated space-weathered skin cloaking the hydrated interior of Ryugu Open
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 …
View article: First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu
First asteroid gas sample delivered by the Hayabusa2 mission: A treasure box from Ryugu Open
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 bot…
View article: Noble gases and nitrogen in samples of asteroid Ryugu record its volatile sources and recent surface evolution
Noble gases and nitrogen in samples of asteroid Ryugu record its volatile sources and recent surface evolution Open
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 measure…
View article: Characterizing the MASCOT landing area with Hayabusa2: Linking the MASCOT rock to the Ryugu samples
Characterizing the MASCOT landing area with Hayabusa2: Linking the MASCOT rock to the Ryugu samples Open
Background After landing on Ryugu, The Mobile Asteroid surface SCOuT (MASCOT) settled in front of a rock that was a bit larger than itself. Multispectral imaging of the rock revealed a dark matrix with numerous small, bright, multi-colored…
View article: Characterization of the MASCOT landing area by Hayabusa2
Characterization of the MASCOT landing area by Hayabusa2 Open
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 appea…
View article: Characterization of the MASCOT landing area by Hayabusa2
Characterization of the MASCOT landing area by Hayabusa2 Open
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 appea…
Inflight calibration of the Optical Navigation Camera for the Extended Mission Phase of Hayabusa2 Open
After delivering its sample capsule to Earth, the Hayabusa2 spacecraft started its extended mission to perform a flyby of asteroid 2001 CC 21 in 2026 and rendezvous with asteroid 1998 KY 26 in 2031. During the extended mission, the optical…
A pristine record of outer Solar System materials from asteroid Ryugu’s returned sample Open
Volatile and organic-rich C-type asteroids may have been one of the main sources of Earth’s water. Our best insight into their chemistry is currently provided by carbonaceous chondritic meteorites, but the meteorite record is biased: only …
Site selection for the Hayabusa2 artificial cratering and subsurface material sampling on Ryugu Open
Hayabusa2 took on the challenge of collecting fresh subsurface samples from asteroid (162173) Ryugu during its second touchdown operation. For this ambitious goal, the spacecraft conducted artificial cratering by using a small carry-on imp…
On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective Open
Presented here are the observations and interpretations from a comprehensive analysis of 16 representative particles returned from the C-type asteroid Ryugu by the Hayabusa2 mission. On average Ryugu particles consist of 50% phyllosilicate…
Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites Open
Carbonaceous meteorites are thought to be fragments of C-type (carbonaceous) asteroids. Samples of the C-type asteroid (162173) Ryugu were retrieved by the Hayabusa2 spacecraft. We measured the mineralogy and bulk chemical and isotopic com…
Three-axial shape distributions of pebbles, cobbles and boulders smaller than a few meters on asteroid Ryugu Open
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Hayabusa2 returned samples: A unique and pristine record of outer Solar System materials from asteroid Ryugu Open
C-type asteroids likely formed in the outer Solar System and were then scattered inwards during giant planet migration (Walsh et al., 2011). They may have transported volatiles to the inner Solar System and created the conditions suitable …
Preliminary analysis of the Hayabusa2 samples returned from C-type asteroid Ryugu Open
C-type asteroids 1 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 b…
Image registration for multi-band images taken by ONC-T onboard Hayabusa2 Open
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…