The rareO-type asteroids have spectra similar to the unusual asteroid3628 Boznemcová, which is the bestasteroid match to the spectra of L6 and LL6 ordinarychondritemeteorites. Their spectra have a deep absorption feature longward of 0.75μm.[1]
Seven asteroids have been classified as O-type by the secondSmall Main-Belt Asteroid Spectroscopic Survey (SMASSII) and none by Tholen'sEight-Color Asteroid Survey. With the exception ofmain-belt asteroid3628 Božněmcová, all other bodies arenear-Earth asteroids from theApollo,Aten orAmor 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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