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CHARACTERISTICS S-types are moderately bright (with an Albedo of 0.10 to 0.22) and consist of Metallic Nickel - Iron mixed with iron- and Magnesium - Silicates . They are dominant in the inner Main Belt within 2.2 AU , common in the central belt within about 3 AU , but become rare further out. The largest is 15 Eunomia (about 330 km wide across its longest dimension), with other large members being 3 Juno and 9 Metis . Their spectrum has a moderately steep slope at wavelengths shorter than 0.7 μm, and has moderate to weak absorption features around 1 μm and 2 μm. The 1 μm absorption is indicative of the presence of Silicate s (stony minerals). Often there is also a broad but shallow absorption feature centered near 0.63 μm. The composition of these asteroids is similar to a variety of stony Meteorites which share similar spectral characteristics. S-GROUP ASTEROIDS See also Asteroid Spectral Types 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:
This whole "S" assemblage of asteroids is spectrally quite distinct from the carbonaceous C-group and the mostly 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. SEE ALSO REFERENCES
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