Japan Geoscience Union Meeting 2014

Presentation information

Poster

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[U-06_28PO1] New Progress toward the Understanding of Small Solar System Bodies

Mon. Apr 28, 2014 6:15 PM - 7:30 PM Poster (3F)

Convener:*Arakawa Masahiko(Graduate School of Science, Kobe University), Taishi Nakamoto(Tokyo Institute of Technology), Sei-ichiro WATANABE Sei-ichiro(Division of Earth and Planetary Sciences, Graduate School of Science, Nagoya University), Masanao Abe(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), MASATERU ISHIGURO(Department of Physics and Astronomy, Seoul National University)

6:15 PM - 7:30 PM

[U06-P20] Visible wavelength spectroscopy of sub-km-sized Near-Earth Asteroids with low delta-v

*Daisuke KURODA1, Masateru ISHIGURO2, Naruhisa TAKATO3, Sunao HASEGAWA4, Masanao ABE4, Yuichi TSUDA4, Seiji SUGITA5, Fumihiko USUI6, Takashi HATTORI3, Ikuru IWATA3, Masatoshi IMANISHI3, Hiroshi TERADA3, Young-jun CHOI7, Sei-ichiro WATANABE8, Makoto YOSHIKAWA4 (1.Okayama Astrophysical Observatory, National Astronomical Observatory of Japan, 2.Department of Physics and Astronomy, Seoul National University, 3.Subaru Telescope, National Astronomical Observatory of Japan, 4.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 5.Graduate School of Frontier Science, The University of Tokyo, 6.Graduate School of Science, The University of Tokyo, 7.Korea Astronomy and Space Science Institute, 8.Graduate School of Science, Nagoya University)

Keywords:asteroid, visible spectroscopy, taxonomic classification

We present a unique data set of the taxonomic type of near-Earth asteroids (NEAs) accessible with available spacecraft. The research on NEAs has entered a new phase thanks to sample-return space explorations together with state-of-the-art large ground-based telescopes. We made observations of twelve asteroids with Subaru, GEMINI-North, GEMINI-South and Okayama 188cm telescopes. They have low delta-v orbits with potential to be investigated by manned/unmanned spacecraft. Also, ten sub-km-sized bodies are included in them, and are one of remarkable characteristics in terms of an evolutionary scenario. We find that eleven asteroids are classified as S-complex and one asteroid as V-type. Most S-complex asteroids (eight out of eleven, 〜70%) have spectra similar to subgroups of Q or Sq-type, suggesting that these objects are less matured against space weathering. In this presentation, we show their spectra and discuss dominance of S-complex asteroids based on the previous research.