The rare O-type asteroids 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.
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:
|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|
- S. J. Bus and R. P. Binzel, Phase II of the Small Main-belt Asteroid Spectroscopy Survey: A feature-based taxonomy, Icarus, Vol. 158, pp. 146 (2002).
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