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:
{| class="wikitable"
! Designation !! Class !! Diam. || Refs
|-
| 349 Dembowska || || ||
|-
| 1904 Massevitch || || ||
|-
| 2371 Dimitrov || || ||
|-
| 5111 Jacliff || || ||
|-
| (257838) 2000 JQ66 || || ||
|-
! colspan=4 style="font-weight: normal; padding: 8px; font-size: smaller;" | Diameter: averaged estimates only; may change over time
|}
References
See also
- Asteroid spectral types