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Table 4 Spectroscopic observations of asteroid Ryugu since its discovery in 2001. Spectral and compositional characteristics are listed

From: Asteroid Ryugu before the Hayabusa2 encounter

Reference Spectral interval (μm) Taxonomy type (T = Tholen; BD = Bus-De Meo) Meteoritical counterpart Spectral characteristics
Binzel et al. 2001 0.4–0.9 Cg (BD) N.A. UV drop-off: red (0.4–0.65 μm); flat (0.65–0.9 μm)
Vilas 2008 0.42–0.93 C (T) CM2 Band at 0.7 μm; flat with very weak band at 0.6 μm
Abe et al. 2008 0.4–2.4 C N.A. Flat and featureless spectral slope (0.85–2.2 μm) 0.89 ± 0.03%/1000 Å
Lazzaro et al. 2013 0.4–0.85 C N.A. Flat and featureless UV drop-off (< 0.45 μm)
Pinilla-Alonso et al. 2013 0.85–2.2 C N.A. Featureless spectral slope (0.85–2.2 μm) 0.37 ± 0.28%/1000 Å
Sugita et al. 2013 0.47–0.8 163 Erigone family CM (heated Murchison) Flat and featureless
Moskovitz et al. 2013 0.44–0.94 C (BD) CM (heated Murchison) CI (Y-86029) Spectrally flat
Perna et al. 2017 0.35–2.15 C (BD) heated Murchison CM unusual/heated CI Featureless UV drop-off (< 0.45 μm); spectral slope (0.5–0.8 μm)
Le Corre et al. 2018 0.8–2.4 C CM2 carbonaceous chondrites, Mighei (grain size < 40 μm) and ALH83100 (grain size < 100 μm) Near-perfect match with NEA (85275) 1994 LY and Mars-crossing asteroid (316720) 1998 BE7