54 citations · 309 across the 19 of their papers we have counts for
18 papers · 1 filter
Spectral evolution of dark asteroid surfaces induced by space weathering over a decade
Sunao Hasegawa, Francesca E. DeMeo, Michael Marsset +20
The surface of airless bodies like asteroids in the Solar System are known to be affected by space weathering. Experiments simulating space weathering are essential for studying th…
Disruption of Saturn's ring particles by thermal stress
Naoyuki Hirata, Ryuji Morishima, Keiji Ohtsuki +1
Spacecraft and ground-based observations show that the main rings of Saturn lack particles larger than 10 m. Tidal or collisional destruction of satellites/comets have been propose…
The appearance of a 'fresh' surface on 596 Scheila as a consequence of the 2010 impact event
Sunao Hasegawa, Michael Marsset, Francesca E. DeMeo +8
Dust emission was detected on main-belt asteroid 596 Scheila in December 2010, and attributed to the collision of a few-tens-of-meters projectile on the surface of the asteroid. In…
Crater shape as a possible record of the impact environment of metallic bodies: Effects of temperature, impact velocity and impactor density
Ryo Ogawa, Akiko M. Nakamura, Ayako I. Suzuki +1
Metallic bodies that were the cores of differentiated bodies are sources of iron meteorites and are considered to have formed early in the terrestrial planet region before migratin…
Primordial porous structure of chondrite parent bodies due to self-gravity
Tomomi Omura, Akiko M. Nakamura
The porosity of an asteroid is important when studying the evolution of our solar system through small bodies and for planning mitigation strategies to avoid disasters due to aster…
Cohesion of regolith: Measurements of meteorite powders
Yuuya Nagaashi, Takanobu Aoki, Akiko M. Nakamura
The cohesion of particles has a significant effect on the properties of small bodies. In this study, we measured in open air, the cohesive forces of tens of micron-sized irregularl…
Collisional disruption of highly porous targets in the strength regime: Effects of mixture
Yuichi Murakami, Akiko M. Nakamura, Koki Yokoyama +2
Highly porous small bodies are thought to have been ubiquitous in the early solar system. Therefore, it is essential to understand the collision process of highly porous objects wh…
Laboratory Experiments on Agglomeration of Particles in a Granular Stream
Yuuya Nagaashi, Tomomi Omura, Masato Kiuchi +3
Inelastic collisions occur among regolith particles, such as those in the ejecta curtain from a crater, and may cause clustering or agglomeration of particles and thus produce disc…
Estimating the porosity structure of granular bodies using the Lane-Emden equation applied to laboratory measurements of the pressure-density relation of fluffy granular samples
Tomomi Omura, Akiko M. Nakamura
The porosity structure of a granular body is an important characteristic that affects evolutionary changes in the body. We conducted compression experiments using fluffy granular s…
Asteroid Ryugu Before the Hayabusa2 Encounter
Koji Wada, Matthias Grott, Patrick Michel +31
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 observat…
Centrifugal Experiments with Simulated Regolith:Effects of Gravity, Size Distribution, and Particle Shape on Porosity
Tomomi Omura, masato Kiuchi, Carsten Güttler +1
Porosity is a key characteristic of the regolith on the surface of small bodies. The porosity of the regolith on the surface of asteroids is changed by applied pressure, and the re…
Impact cratering on porous targets in the strength regime
Akiko M. Nakamura
Cratering on small bodies is crucial for the collision cascade and also contributes to the ejection of dust particles into interplanetary space. A crater cavity forms against the m…
Experimental study on compression property of regolith analogues
Tomomi Omura, Akiko M. Nakamura
The compression property of regolith reflects the strength and porosity of the regolith layer on small bodies and their variations in the layer that largely influence the collision…
Anisotropic Ejection from Active Asteroid P/2010 A2: An Implication of Impact Shattering on an Asteroid
Yoonyoung Kim, Masateru Ishiguro, Tatsuhiro Michikami +1
We revisited a mass ejection phenomenon that occurred in asteroid P/2010 A2 in terms of the dynamical properties of the dust particles and large fragments. We constructed a model a…
Cratering Experiments on the Self Armoring of Coarse-Grained Granular Targets
Carsten Güttler, Naru Hirata, Akiko M. Nakamura
Recently published crater statistics on the small asteroids 25143 Itokawa and 433 Eros show a significant depletion of craters below approx. 100 m in diameter. Possible mechanisms…
The dynamical evolution of dwarf planet (136108) Haumea's collisional family: General properties and implications for the trans-Neptunian belt
Patryk Sofia Lykawka, Jonathan Horner, Tadashi Mukai +1
Recently, the first collisional family was identified in the trans-Neptunian belt. The family consists of Haumea and at least ten other ~100km-sized trans-Neptunian objects (TNOs)…
Interpretation of (596) Scheila's Triple Dust Tails
Masateru Ishiguro, Hidekazu Hanayama, Sunao Hasegawa +16
Strange-looking dust cloud around asteroid (596) Scheila was discovered on 2010 December 11.44-11.47. Unlike normal cometary tails, it consisted of three tails and faded within two…
The Hayabusa Spacecraft Asteroid Multi-Band Imaging Camera: AMICA
Masateru Ishiguro, Ryosuke Nakamura, David J. Tholen +12
The Hayabusa Spacecraft Asteroid Multiband Imaging Camera (AMICA) has acquired more than 1400 multispectral and high-resolution images of its target asteroid, 25143 Itokawa, since…