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What (who) is X-type asteroid - definition
X-type asteroid
The X-group of asteroids collects together several types with similar spectra, but probably quite different compositions.
D-type asteroid
TYPE OF ASTEROID
D type asteroid; Type-D asteroid; D-type asteroids
D-type asteroids have a very low albedo and a featureless reddish spectrum. It has been suggested that they have a composition of organic-rich silicates, carbon and anhydrous silicates, possibly with water ice in their interiors.
A-type asteroid
ASTEROID CLASS
A type asteroid; A-type asteroids
A-type asteroids are relatively uncommon inner-belt asteroids that have a strong, broad 1 μm olivine feature and a very reddish spectrum shortwards of 0.7 μm.
