6:15 PM - 7:30 PM
[U06-P20] Visible wavelength spectroscopy of sub-km-sized Near-Earth Asteroids with low delta-v
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.