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T-type asteroids are rare inner-beltasteroids of unknown composition with dark, featureless and moderatelyredspectra, and a moderate absorption feature shortwards of 0.85 μm. No directmeteorite analog has been found to date. Thought to beanhydrous, they are considered to be related toP-types orD-types, or possibly a highly alteredC-type.
Examples of T-type asteroids include96 Aegle,114 Kassandra,233 Asterope, and308 Polyxo. The infrared spectrum of the first three are similar to the mineraltroilite, while 308 Polyxo is modified with hydration features.[1]
In 2010, the asteroid596 Scheila was impacted by a projectile. The impact changed its spectrum from T-type to D-type, likely by exposing fresh material that was notweathered.[2]
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