Kuroda, Daisuke Geem, Jooyeon Akitaya, Hiroshi Jin, Sunho Takahashi, Jun Takahashi, Koki Naito, Hiroyuki Makino, Kana Sekiguchi, Tomohiko Bach, Yoonsoo P. Seo, Jinguk Sato, Shuji Sasago, Hiroshi Kawabata, Koji S. Kawakami, Aoi Tozuka, Miyako Watanabe, Makoto Takagi, Seiko Kuramoto, Kiyoshi Yoshikawa, Makoto Hasegawa, Sunao Ishiguro, Masateru
The Astrophysical Journal 911(2) 2021年4月
The asteroid exploration project "Hayabusa2" has successfully returned samples from the asteroid (162173) Ryugu. In this study, we measured the linear polarization degrees of Ryugu using four ground-based telescopes from 2020 September 27 to Decem...
Nagaashi, Yuuya Nakamura, Akiko M. Hasegawa, Sunao Wada, Koji
Physical Review E 103(3) 2021年3月
We study the packing fraction of clusters in free-falling streams of spherical and irregularly shaped particles using flash x-ray radiography. The estimated packing fraction of clusters is low enough to correspond to coordination numbers less than...
Deorbit methods have been employed to remove space debris from orbit. One of these methods is to utilize atmospheric drag. In this method, a membrane loaded into the spacecraft is expanded to increase atmospheric drag. Although this method works w...
Publications of the Astronomical Society of Japan 73(1) 240-255 2021年2月
Most C-complex asteroids have albedo values less than 0.1, but there are some high-albedo (bright) C-complex asteroids with albedo values exceeding 0.1. To reveal the nature and origin of bright C-complex asteroids, we conducted spectroscopic obse...
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