O-type asteroid
Asteroid spectral type
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O-type asteroids are a rare type of asteroids that have spectra similar to the unusual asteroid 3628 Boznemcová, which is the best asteroid match to the spectra of L6 and LL6 ordinary chondrite meteorites. Their spectra have a deep absorption feature longward of 0.75 μm.[1]
List
Seven asteroids have been classified as O-type by the second Small Main-Belt Asteroid Spectroscopic Survey (SMASSII) and none by Tholen's Eight-Color Asteroid Survey. With the exception of main-belt asteroid 3628 Božněmcová, all other bodies are near-Earth asteroids from the Apollo, Aten or Amor group:
| Designation | Class | Diam. | Refs |
|---|---|---|---|
| 3628 Božněmcová | main-belt | 6.914 km | MPC · JPL |
| 4034 Vishnu | Apollo | 0.42 km | MPC · JPL |
| 4341 Poseidon | Apollo | 2 km | MPC · JPL |
| 5143 Heracles | Apollo | 4.843 km | MPC · JPL |
| (8201) 1994 AH2 | Apollo | 1.859 km | MPC · JPL |
| (162385) 2000 BM19 | Aten | 0.57 km | MPC · JPL |
| 1997 RT | Amor | 0.3 km | MPC · JPL |
| Diameter: averaged estimates only; may change over time | |||
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