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. They are thought to come from the completely differentiated mantle of an asteroid.
A-type asteroids are so rare that as of 2018 only 17 had been discovered (246 Asporina, 289 Nenetta, 446 Aeternitas, 863 Benkoela, 1126 Otero, 1600 Vyssotsky, 1951 Lick, 2234 Schmadel, 2423 Ibarruri, 2501 Lohja, 2715 Mielikki, 2732 Witt, 3352 McAuliffe, 4142 Dersu-Uzala, 4713 Steel, 4982 Bartini and 5641 McCleese).
- "JPL Small-Body Database Search Engine: spec. type = A (SMASSII)". JPL Solar System Dynamics. Retrieved 2018-06-21.
- Mineralogic and Temperature-Induced Spectral Investigations of A-type Asteroids: (246) Asporina and (446) Aeternitas, V. Reddy, Lunar and Planetary Science XXXVI (2005)
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