Surface analysis of asteroids (IMAGE)

Tokyo Institute of Technology

Surface analysis of asteroids

Caption

(a) 3.1 μm absorption depth (horizontal axis) indicating the presence of ammoniated phyllosilicates. Black: asteroids observed by AKARI. Orange: meteorites derived from C-type asteroids. Blue: theoretical calculation results for the initial composition, including ammonia ice (the number is the ratio of water to rocks and corresponds to the horizontal axis in Figure 3b). (b) Black lines: reflectance of the asteroids showing 3.1 μm absorption. Blue line: reflectance of mineral combinations containing ammoniated phyllosilicates obtained from theoretical calculations. Purple line: reflectance of an asteroid covered with water ice, obtained from theoretical calculations. The locations where three major absorption features appear are indicated by coloured areas. Red area at around 2.7μm: hydrous minerals. Blue area at around 3.1 μm: ammoniated phyllosilicates or water ice. Green areas at around 3.4 μm and 4.0 μm: carbonates.

Credit

Reproduced from Kurokawa et al. 2022 AGU Advances

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