The majority of bodies fall again into the three broad C, S, and X categories, with a few unusual bodies categorized into several smaller types: Attempting to keep to the Tholen taxonomy as much as possible given the differing data, asteroids were sorted into the 24 types given below. However, a somewhat smaller range of wavelengths (0.44 μm to 0.92 μm) was observed. This survey produced spectra of a far higher resolution than ECAS, and was able to resolve a variety of narrow spectral features. Binzel in 2002, based on the Small Main-Belt Asteroid Spectroscopic Survey ( SMASS) of 1,447 asteroids. This is a more recent taxonomy introduced by Schelte J. CG when their properties were a combination of those typical for several types. Objects were sometimes assigned a combined type such as e.g. P-type ( 259 Aletheia, 190 Ismene CP: 324 Bamberga) differ from M-type mostly by low albedo.

E-type ( 44 Nysa, 55 Pandora) differ from M-type mostly by high albedo.M-type ( 16 Psyche) metallic objects, the third most populous group.S-type ( 15 Eunomia, 3 Juno) silicaceous (or 'stony') objects.C-type ( 10 Hygiea) the remaining majority of 'standard' C-type asteroids.This scheme includes 14 types with the majority of asteroids falling into one of three broad categories, and several smaller types. The original formulation was based on 978 asteroids. This classification was developed from broad band spectra (between 0.31 μm and 1.06 μm) obtained during the Eight-Color Asteroid Survey (ECAS) in the 1980s, in combination with albedo measurements. The most widely used taxonomy for over a decade has been that of David J. The two most widely used classifications are described below: Tholen classification This is due to the use of different criteria for each approach. This classification has since been expanded and clarified.Ī number of classification schemes are currently in existence, and while they strive to retain some mutual consistency, quite a few asteroids are sorted into different classes depending on the particular scheme. Chapman, David Morrison, and Ben Zellner in 1975 with three categories: C for dark carbonaceous objects, S for stony (silicaceous) objects, and U for those that did not fit into either C or S. The present-day classification was initiated by Clark R.

Typesy asteroids