title: O-type asteroid
text: # O-type asteroid
  
  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.
  
  ## 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 ||||
  