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Asteroid taxonomic classes

Asteroid taxonomic classes

Table
Asteroid taxonomic classes
class mean albedo spectral reflectivity (at wavelengths of 0.3–1.1 micrometres [μm])
C 0.05 neutral, slight absorption at wavelengths of 0.4 μm or shorter
D 0.04 very red at wavelengths of 0.7 μm or longer
F 0.05 flat
P 0.04 featureless, sloping up into red*
G 0.09 similar to C class but with a deeper absorption at wavelengths of 0.4 μm or shorter
K 0.12 similar to S class but with lower slopes
T 0.08 moderately sloped with weak ultraviolet and infrared absorption bands
B 0.14 similar to C class but with shallower slope toward longer wavelengths
M 0.14 featureless, sloping up into red*
Q 0.21 strong absorption features shortward and longward of 0.7 μm
S 0.18 very red at wavelengths of less than 0.7 μm, typically with an absorption band between 0.9 and 1.0 μm
A 0.42 extremely red at wavelengths shorter than 0.7 μm and a deep absorption longward of 0.7 μm
E 0.44 featureless, sloping up into red*
R 0.35 similar to A class but with slightly weaker absorption bands
V 0.34 very red at wavelengths of less than 0.7 μm and a deep absorption band centred near 0.95 μm
other any any object not falling into one of the above classes
*Classes E, M, and P are spectrally indistinguishable at these wavelengths and require an independent albedo measurement for unambiguous classification.
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Universalium. 2010.

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