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The X-group of asteroids collects together several types with similar spectra, but probably quite different compositions. == Tholen classification == In the Tholen classification the X-group contains the types: * E-type – with high albedos, typically above 0.30 * M-type – intermediate albedo, "metallic", the largest grouping, * P-type – low albedos, typically below 0.10 Since in this scheme the albedo is crucial in discriminating between the above types, some objects for which albedo information was not available were assigned an X-type. An example of this is 50 Virginia. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「X-type asteroid」の詳細全文を読む スポンサード リンク
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