A-type asteroids are relatively uncommon inner-belt asteroids that have a strong , broad NUMBER@1 µm olivine feature and a very reddish spectrum shortwards of NUMBER@2 µm . They are thought to come from the completely differentiated mantle of an asteroid .

A-type asteroids are fairly uncommon closer asteroids that have a strong , broad NUMBER@1 µm olivine feature and a very reddish spectrum shortwards of NUMBER@2 µm . They are thought to come from the completely differentiated mantle of an asteroid .
