R-type asteroids are moderately bright, relatively uncommon inner-beltasteroids that are spectrally intermediate between theV andA-type asteroids. The spectrum shows distinctolivine andpyroxene features at 1 and 2micrometres, with a possibility ofplagioclase. Shortwards of 0.7 μm the spectrum is very reddish.
TheIRAS mission has classified4 Vesta,246 Asporina,349 Dembowska,571 Dulcinea and937 Bethgea as type R; however, the re-classification of Vesta, the V archetype, is debatable. Of these bodies, only349 Dembowska is recognized as being type R when all wavelengths are taken into account.
As of February 2019, at least 5 asteroids have been classified as R-type:[1]
| 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 | |||
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