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Article
Open AccessParticle size distributions inside and around the artificial crater produced by the Hayabusa2 impact experiment on Ryugu
Japanese Hayabusa2 spacecraft has successfully carried out an impact experiment using a small carry-on impactor (SCI) on an asteroid (162173) Ryugu. We examine the size distribution of particles inside and out...
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Article
First compositional analysis of Ryugu samples by the MicrOmega hyperspectral microscope
The characterization of objects that have best preserved the mineralogical and molecular phases formed in the earliest stages of the Solar System evolution is key to understanding the processes that led to the...
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Article
Open AccessMid-infrared emissivity of partially dehydrated asteroid (162173) Ryugu shows strong signs of aqueous alteration
The near-Earth asteroid (162173) Ryugu, the target of Hayabusa2 space mission, was observed via both orbiter and the lander instruments. The infrared radiometer on the MASCOT lander (MARA) is the only instrume...
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Article
Anomalously porous boulders on (162173) Ryugu as primordial materials from its parent body
Planetesimals—the initial stage of the planetary formation process—are considered to be initially very porous aggregates of dusts1,2, and subsequent thermal and compaction processes reduce their porosity3. The Ha...
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Article
Thermally altered subsurface material of asteroid (162173) Ryugu
Analyses of meteorites and theoretical models indicate that some carbonaceous near-Earth asteroids may have been thermally altered due to radiative heating during close approaches to the Sun1–3. However, the lack...
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Article
Collisional history of Ryugu’s parent body from bright surface boulders
The asteroid (162173) Ryugu and other rubble-pile asteroids are likely re-accumulated fragments of much larger parent bodies that were disrupted by impacts. However, the collisional and orbital pathways from t...
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Article
Author Correction: Shape of (101955) Bennu indicative of a rubble pile with internal stiffness
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Article
Open AccessCollisional formation of top-shaped asteroids and implications for the origins of Ryugu and Bennu
Asteroid shapes and hydration levels can serve as tracers of their history and origin. For instance, the asteroids (162173) Ryugu and (101955) Bennu have an oblate spheroidal shape with a pronounced equator, b...
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Article
Shape of (101955) Bennu indicative of a rubble pile with internal stiffness
The shapes of asteroids reflect interplay between their interior properties and the processes responsible for their formation and evolution as they journey through the Solar System. Prior to the OSIRIS-REx (Or...
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Article
Open AccessEurope’s lost forests: a pollen-based synthesis for the last 11,000 years
8000 years ago, prior to Neolithic agriculture, Europe was mostly a wooded continent. Since then, its forest cover has been progressively fragmented, so that today it covers less than half of Europe’s land are...
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Article
Preflight Calibration Test Results for Optical Navigation Camera Telescope (ONC-T) Onboard the Hayabusa2 Spacecraft
The optical navigation camera telescope (ONC-T) is a telescopic framing camera with seven colors onboard the Hayabusa2 spacecraft launched on December 3, 2014. The main objectives of this instrument are to optica...
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Article
The Camera of the MASCOT Asteroid Lander on Board Hayabusa 2
The MASCOT Camera (MasCam) is part of the Mobile Asteroid Surface Scout (MASCOT) lander’s science payload. MASCOT has been launched to asteroid (162173) Ryugu onboard JAXA’s Hayabusa 2 asteroid sample return m...
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Article
Open Accessϒ-secretase and LARG mediate distinct RGMa activities to control appropriate layer targeting within the optic tectum
While a great deal of progress has been made in understanding the molecular mechanisms that regulate retino-tectal map**, the determinants that target retinal projections to specific layers of the optic tect...
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Article
Syntaxin-3 regulates newcomer insulin granule exocytosis and compound fusion in pancreatic beta cells
The molecular basis of the exocytosis of secretory insulin-containing granules (SGs) during biphasic glucose-stimulated insulin secretion (GSIS) from pancreatic beta cells remains unclear. Syntaxin (SYN)-1A an...
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Article
Open AccessPollen-based continental climate reconstructions at 6 and 21 ka: a global synthesis
Subfossil pollen and plant macrofossil data derived from 14C-dated sediment profiles can provide quantitative information on glacial and interglacial climates. The data allow climate variables related to growing-...
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Article
Open AccessInterpretation on Deep Impact results: Radial distribution of ejecta and the size distribution of large-sized grains
Several observations of dust grains ejected from the comet 9P/Tempel 1 by the Deep Impact event strongly suggest that the evaporation and expansion of volatiles occurred and that the vapor accelerated some dus...
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Chapter and Conference Paper
Subaru/COMICS Mid-Infrared Spectroscopic Observations of the Dust Plume from Comet 9P/Tempel
We carried out mid-infrared observations of the Deep Impact (DI) collision with a Jupiter-family (JF) comet, 9P/Tempel, using the Cooled Mid-Infrared Camera and Spectrometer (COMICS) on the 8.2 m Subaru Telesc...
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Chapter and Conference Paper
The Subsurface Structure of Comet 9P/Tempel 1 Projected into the Dust Plume
Cometary nuclei are believed to contain important information on the condition of the solar nebula, but little observational data is available on their interior structure. Our ground-based observations of NASA...
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Chapter and Conference Paper
One Month of Near-IR Imaging Photometry of Comet 9P/Tempel 1
We performed a month-long near-IR photometric and imaging observations of comet 9P/Tempel 1 in South Africa IRSF/SIRIUS. Our monitoring of comet brightness shows that a sustained comet activity and outbursts w...
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Article
Automation of casting products finishing works by a robot—development of a hammering tool and its compensation function
This study deals with the development of a new hammering tool called an “air-chipper”. A hammering tool is a typical deburring tool which is conventionally used to debur cast workpieces. Although the air-chipp...
