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, and appear to have a high density. One survey found that 7 similar A-, V- and X-type asteroids had an average density of 3.6 g/cm3.[1]
List
A-type asteroids are so rare that as of February 2019, only 17 had been discovered:[2]
| Designation | Class | Diam. | Refs |
|---|---|---|---|
| 246 Asporina | main-belt | 50.891 km | MPC · JPL |
| 289 Nenetta | main-belt | 37.586 km | MPC · JPL |
| 446 Aeternitas | main-belt | 53.562 km | MPC · JPL |
| 863 Benkoela | main-belt | 38.724 km | MPC · JPL |
| 1126 Otero | main-belt | 10.974 km | MPC · JPL |
| 1600 Vyssotsky | main-belt | 7.413 km | MPC · JPL |
| 1951 Lick | Mars-crossing | 5.57 km | MPC · JPL |
| 2234 Schmadel | main-belt | 9.473 km | MPC · JPL |
| 2423 Ibarruri | Mars-crossing | 4.899 km | MPC · JPL |
| 2501 Lohja | main-belt | 10.218 km | MPC · JPL |
| 2715 Mielikki | main-belt | 13.252 km | MPC · JPL |
| 2732 Witt | main-belt | 11.001 km | MPC · JPL |
| 3352 McAuliffe | Amor | 2.1 km | MPC · JPL |
| 4142 Dersu-Uzala | Mars-crossing | 7.1 km | MPC · JPL |
| 4713 Steel | main-belt | 6.286 km | MPC · JPL |
| 4982 Bartini | main-belt | 7.975 km | MPC · JPL |
| 5641 McCleese | Mars-crossing | 5.68 km | MPC · JPL |
| Diameter: averaged estimates only; may change over time | |||
See also
References
External links
- Mineralogic and Temperature-Induced Spectral Investigations of A-type Asteroids: (246) Asporina and (446) Aeternitas, V. Reddy, Lunar and Planetary Science XXXVI (2005)