X-type asteroid

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The X-group of asteroids collects together several types with similar spectra, having largely metallic composition.

Tholen classification

In the Tholen classification the X-group contains the types:

E-type
M-type, the largest grouping
P-type

Since in this scheme the albedo is crucial in discriminating between the above types, some objects for which albedo information was not available were assigned an X-type. An example of this is 50 Virginia.

SMASS classification

The SMASS classification does not use albedo, but several spectral types are distinguished on the basis of spectral features which were too subtle to be visible in the broad-band ECAS survey used for the Tholen scheme. The X-group contains the types:

core X-type containing the asteroids with the most "typical" spectra
Xe-type of asteroids whose spectra contain a moderately broad absorption band around 0.49 μm. It has been suggested that this indicates the presence of triolite (FeS). There is some correlation between this group and the Tholen E-type.
Xc- and Xk-type asteroids, which contain a broad convex spectral feature in the range 0.55 μm to &0.8 μm (i.e. increased flux#electromagnetic_radiation in this range). These spectra tend to be intermediate between the core X-type and the C and K-type.

Apart from the Xe-type, there is no significant correlation between the split into these SMASS types and the Tholen E, M, and P-types. All the types in the X-group contain a mixture of asteroids classified as either type E, M, or P.

You can use the "What links here" toolbox link to find asteroids of this type.

References

S. J. Bus and R. P. Binzel Phase II of the Small Main-belt Asteroid Spectroscopy Survey: A feature-based taxonomy, Icarus, Vol. 158, pp. 146 (2002).

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