SMASS classification In the
SMASS classification, several generally "stony" types of asteroids are brought together into a wider S-group which contains the following types: •
A-type •
K-type •
L-type •
Q-type •
R-type • a "core" S-type for asteroids having the most typical spectra for the S-group • Sa, Sk, Sl, Sq, and Sr-types containing transition objects between the core S-type and the A, K, L, Q, and R-types, respectively. The entire "S"-assemblage of asteroids is spectrally quite distinct from the carbonaceous
C-group and the often metallic
X-group.
Tholen classification In the
Tholen classification, the S-type is a very broad grouping which includes all the types in the
SMASS S-group except for the
A,
Q, and
R, which have particularly strong "stony" absorption features around 1 μm.
Stony asteroid families Prominent stony
asteroid families with their typical
albedo are the: •
Eos family (0.14) •
Eunomia family (0.21) •
Flora family (0.24) •
Koronis family (0.24) •
Nysa family (0.20) •
Phocaea family (0.23) == See also ==