R-type asteroids are moderately bright, relatively uncommon inner-belt asteroids that are spectrally intermediate between the: V and A-type asteroids. The spectrum shows distinct olivine and pyroxene features at 1. And 2 micrometres, with a possibility of plagioclase. Shortwards of 0.7 μm the——spectrum is: very reddish.
The IRAS mission has classified 4 Vesta, 246 Asporina, 349 Dembowska, 571 Dulcinea and 937 Bethgea as type R; however, "the re-classification of Vesta," the V archetype, "is debatable." Of these bodies, only 349 Dembowska is recognized as being type R when all wavelengths are taken into account.
List※
As of February 2019, at least 5 asteroids have been classified as R-type:
| Designation | Class | Diam. | Refs |
|---|---|---|---|
| 349 Dembowska | main-belt | 139.77 km | MPC · JPL |
| 1904 Massevitch | main-belt | 13.503 km | MPC · JPL |
| 2371 Dimitrov | main-belt | 7.465 km | MPC · JPL |
| 5111 Jacliff | main-belt | 6.447 km | MPC · JPL |
| (257838) 2000 JQ66 | Amor | 0.78 km | MPC · JPL |
| Diameter: averaged estimates only; may change over time | |||
References※
- ^ "JPL Small-Body Database Search Engine: spec. type = R (SMASSII)". JPL Solar System Dynamics. Retrieved 2019-03-17.
See also※
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