This is a more recent taxonomy introduced by Schelte J. Bus and Richard P. Binzel in 2002 , based on the Small Main-Belt Asteroid Spectroscopic Survey ( SMASS ) of 1447 asteroids ( 5 ) . This is a more recent taxonomy introduced by Schelte J. Bus and Richard P. Binzel in 2002 , based on the Small Main-Belt Asteroid Spectroscopic Survey ( SMASS ) of 1447 asteroids .