Search Results - "SUGITA, Seiji"
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Cratering efficiency on coarse-grain targets: Implications for the dynamical evolution of asteroid 25143 Itokawa
Published in Icarus (New York, N.Y. 1962) (15-01-2018)“…•Cratering experiments on coarse-grained targets are performed.•A new crater size scaling on coarse-grained targets is derived.•Projectile size and impact…”
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An experimental study of photo-oxidation of Fe(II): Implications for the formation of Fe(III) (hydro)oxides on early Mars and Earth
Published in Geochimica et cosmochimica acta (15-04-2021)“…•The pH-dependence of the photo-oxidation of Fe(II) was investigated experimentally.•A formula of quantum yields of Fe2+ photo-oxidation at pH 3–7 was…”
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Dynamics of gas-driven eruption on Ceres as a probe to its interior
Published in Icarus (New York, N.Y. 1962) (01-08-2023)“…The mineralogy of localized bright deposits on Ceres observed by the DAWN mission suggests their brine-enriched cryovolcanic origin. Based on the morphological…”
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Soluble Organic Molecules in Samples of the Carbonaceous Asteroid (162173) Ryugu
Published in Science (American Association for the Advancement of Science) (24-02-2023)“…The Hayabusa2 spacecraft collected samples from the surface of the carbonaceous near-Earth asteroid (162173) Ryugu, and brought them to Earth. The samples were…”
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Mars’ atmospheric neon suggests volatile-rich primitive mantle
Published in Icarus (New York, N.Y. 1962) (01-12-2021)“…Martian atmospheric neon (Ne) has been detected by Viking and also found as trapped gas in Martian meteorites, though its abundance and isotopic composition…”
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Highly porous nature of a primitive asteroid revealed by thermal imaging
Published in Nature (London) (01-03-2020)“…Carbonaceous (C-type) asteroids 1 are relics of the early Solar System that have preserved primitive materials since their formation approximately 4.6 billion…”
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Macromolecular organic matter in samples of the asteroid (162173) Ryugu
Published in Science (American Association for the Advancement of Science) (24-02-2023)“…Samples of the carbonaceous asteroid (162173) Ryugu were collected and brought to Earth by the Hayabusa2 spacecraft. We investigated the macromolecular organic…”
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Spectrally blue hydrated parent body of asteroid (162173) Ryugu
Published in Nature communications (05-10-2021)“…Ryugu is a carbonaceous rubble-pile asteroid visited by the Hayabusa2 spacecraft. Small rubble pile asteroids record the thermal evolution of their much larger…”
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The molecular composition of impact-generated atmospheres on terrestrial planets during the post-accretion stage
Published in Icarus (New York, N.Y. 1962) (01-09-2015)“…•Composition of impact-generated atmospheres on terrestrial planets is discussed.•Composition of the impact vapor plume is mainly controlled by impact…”
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Preliminary analysis of the Hayabusa2 samples returned from C-type asteroid Ryugu
Published in Nature astronomy (01-02-2022)“…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…”
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Utilization of a meteorological satellite as a space telescope: the lunar mid-infrared spectrum as seen by Himawari-8
Published in Earth, planets, and space (04-07-2022)“…The Japanese meteorological satellite Himawari-8 has captured the Earth’s atmosphere and stars, planets, and the Moon in its field of view, enabling us to…”
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Thermophysical properties of the surface of asteroid 162173 Ryugu: Infrared observations and thermal inertia mapping
Published in Icarus (New York, N.Y. 1962) (15-09-2020)“…TIR, the thermal infrared imager on Hayabusa2, acquired high-resolution thermal images of the asteroid 162173 Ryugu for one asteroid rotation period on August…”
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The ESA Hera Mission: Detailed Characterization of the DART Impact Outcome and of the Binary Asteroid (65803) Didymos
Published in The planetary science journal (01-07-2022)“…Abstract Hera is a planetary defense mission under development in the Space Safety and Security Program of the European Space Agency for launch in 2024…”
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Experimental study of heterogeneous organic chemistry induced by far ultraviolet light: Implications for growth of organic aerosols by CH3 addition in the atmospheres of Titan and early Earth
Published in Icarus (New York, N.Y. 1962) (01-06-2018)“…•Experimental investigations on organic aerosol growth by FUV light are performed.•Growth rate of organic film dramatically decreases for CH4/CO2 < 1.•Surface…”
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Updated inflight calibration of Hayabusa2's optical navigation camera (ONC) for scientific observations during the cruise phase
Published in Icarus (New York, N.Y. 1962) (01-06-2019)“…The Optical Navigation Cameras (ONC-T, ONC-W1, ONC-W2) onboard Hayabusa2 are also being used for scientific observations of the mission target, C-complex…”
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Post-arrival calibration of Hayabusa2's optical navigation cameras (ONCs): Severe effects from touchdown events
Published in Icarus (New York, N.Y. 1962) (15-05-2021)“…Accurate measurements of the surface brightness and its spectrophotometric properties are essential for obtaining reliable observations of the physical and…”
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Vis-NIR disk-integrated photometry of asteroid 25143 Itokawa around opposition by AMICA/Hayabusa
Published in Icarus (New York, N.Y. 1962) (01-09-2018)“…•Photometry of the S-type Itokawa observed by multi-band filters is examined.•AMICA/Hayabusa successfully observed the opposition surge of the asteroid…”
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Resurfacing processes on asteroid (162173) Ryugu caused by an artificial impact of Hayabusa2's Small Carry-on Impactor
Published in Icarus (New York, N.Y. 1962) (15-09-2021)“…The resurfacing process on Ryugu accompanying the artificial impact crater formation by Hayabusa2's Small Carry-on Impactor (SCI) was studied by comparing pre-…”
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Ground-based characterization of Hayabusa2 mission target asteroid 162173 Ryugu: constraining mineralogical composition in preparation for spacecraft operations
Published in Monthly notices of the Royal Astronomical Society (21-03-2018)“…Abstract Asteroids that are targets of spacecraft missions are interesting because they present us with an opportunity to validate ground-based spectral…”
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A pristine record of outer Solar System materials from asteroid Ryugu’s returned sample
Published in Nature astronomy (01-10-2022)“…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…”
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