D. Kuroda

Simultaneous Tricolor Video Observations of Three Tiny Near-Earth Asteroids with Subminute Rotation Periods

Jin Beniyama, Ryou Ohsawa, Shigeyuki Sako, S. Takita et autres

Abstract Studying the physical properties of near-Earth asteroids (NEAs) is crucial for understanding their dynamical histories and origins, and assessing impact hazards to Earth. Tiny NEAs with diameters smaller than 100 m are intrinsically faint and are typically observable only during close …

fr, jp (code pays fourni par la source)

Dark asteroids exhibiting intermediate characteristics between C and X types

Sunao Hasegawa, Chrysa Avdellidou, Michaël Marsset, Ullas Bhat et autres

ABSTRACT Large main-belt asteroids with visible geometric albedos below 0.1 are predominantly classified within the C- and X-complex spectroscopic classes. C-type and dark X-type asteroids typically exhibit flat to slightly negative and positive spectral slopes, respectively. They are further distinguished by the …

jp, gb, de, fr, kr, us (code pays fourni par la source)

From Deep Generative Models to Structure-Based Simulations

D. Kuroda

In the rapidly evolving field of biotherapeutics, the intersection of computational science and protein engineering has revolutionized the approach to drug discovery and development. Central to this transformation is the art of antibody design, a complex and critical component of modern therapeutic …

New evidence supporting past dust ejections from active asteroid (4015) Wilson–Harrington

Sunho Jin, Masateru Ishiguro, Jooyeon Geem, Jun Takahashi et autres

Context. (4015) Wilson-Harrington (hereafter, WH) was discovered as a comet in 1949 but has a dynamical property consistent with that of a near-Earth asteroid. Although there is a report that the 1949 activity is associated with an ion tail, the cause of …

kr, jp, it (code pays fourni par la source)

New evidence supporting past dust ejections from active asteroid (4015) Wilson-Harrington

Sunho Jin, Masateru Ishiguro, Jooyeon Geem, Hiroyuki Naito et autres

Context. (4015) Wilson-Harrington (hereafter, WH) was discovered as a comet in 1949 but has a dynamical property consistent with that of a near-Earth asteroid. Although there is a report that the 1949 activity is associated with an ion tail, the cause of …

Spectral and photometric characterization of the two targets of the extended mission of Hayabusa2

Jules Bourdelle de Micas, D. Perna, A. Barucci, E. Dotto et autres

Following a successful nominal mission resulting in the return of samples from the Near-Earth Object (NEO) Ryugu, the JAXA mission Hayabusa2 has been extended to study two other objects. The first is the NEO (98943) 2001 CC21, at which the spacecraft will …

fr, it, jp, kr, us (code pays fourni par la source)

Study of hydrated asteroids via their polarimetric properties at low phase angles

Jooyeon Geem, Masateru Ishiguro, Hiroyuki Naito, Sunao Hasegawa et autres

Context. Ch-type asteroids are distinctive among other dark asteroids in that they exhibit deep negative polarization branches (NPBs). Nevertheless, the physical and compositional properties that cause their polarimetric distinctiveness are less investigated. Aims. We aim to investigate the polarimetric uniqueness of Ch-type …

kr, jp (code pays fourni par la source)

Candidate Main-belt Asteroids for Surface Heterogeneity

Sunao Hasegawa, Michaël Marsset, F. E. DeMeo, J. Hanuš et autres

Abstract Large terrestrial bodies in our solar system like the Earth, Mars, Mercury, and the Moon exhibit geologically complex surfaces with compositional heterogeneity. From past studies using large telescopes and spacecraft, it was shown that asteroids with diameters larger than 100 km …

jp, cl, cz, us, il, kr, fr (code pays fourni par la source)

Quantitative grain size estimation on airless bodies from the negative polarization branch

Yoonsoo P. Bach, Masateru Ishiguro, Jun Takahashi, Jooyeon Geem et autres

Context.Sunlight scattered from the surface of an airless body is generally partially polarized, and the corresponding polarization state includes information about the scattering surface, such as albedo, surface grain sizes, composition, and taxonomic types. Most polarimetric studies on airless bodies thus far …

kr, jp (code pays fourni par la source)

Quantitative grain size estimation on airless bodies from the negative polarization branch. II. Dawn mission targets (4) Vesta and (1) Ceres

Yoonsoo P. Bach, Masateru Ishiguro, Jun Takahashi, Jooyeon Geem et autres

Context. Sunlight scattered from the surface of an airless body is generally partially polarized, and the corresponding polarization state includes information about the scattering surface, such as albedo, surface grain sizes, composition, and taxonomic types. Aims. We conducted polarimetry of two large …

Quantitative grain size estimation on airless bodies from the negative polarization branch. I. Insights from experiments and lunar observations

Yoonsoo P. Bach, Masateru Ishiguro, Jun Takahashi, Jooyeon Geem et autres

This work explores characteristics of the negative polarization branch (NPB), which occurs in scattered light from rough surfaces, with particular focus on the effects of fine particles. Factors such as albedo, compression, roughness, and the refractive index are considered to determine their …

kr, jp (code pays fourni par la source)

Quantitative grain size estimation on airless bodies from the negative polarization branch

Yoonsoo P. Bach, Masateru Ishiguro, Jun Takahashi, Jooyeon Geem et autres

This work explores characteristics of the negative polarization branch (NPB), which occurs in scattered light from rough surfaces, with particular focus on the effects of fine particles. Factors such as albedo, compression, roughness, and the refractive index are considered to determine their …

kr, jp (code pays fourni par la source)