Type of carbonaceous asteroid
F-type asteroids are a relatively uncommon type of carbonaceous asteroid, falling into the wider C-group.
Characteristics.
F-type asteroids have spectra generally similar to those of the B-type asteroids, but
lack the "water" absorption feature around 3 μm indicative of hydrated minerals, and differ in the low wavelength part of the ultraviolet spectrum below 0.4 μm.
The F-type and B-type asteroids are not distinguishable with the criteria used in the SMASS classification, so in that scheme are grouped together under the B-type.
References.
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