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We present observations of thermal emission from fifteen transneptunianobjects (TNOs) made using the Spitzer Space Telescope. Thirteen of the targetsare members of the Classical population: six dynamically hot Classicals, fivedynamically cold Classicals, and two dynamically cold inner Classical KuiperBelt Objects (KBOs). We fit our observations using thermal models to determinethe sizes and albedos of our targets finding that the cold Classical TNOs havedistinctly higher visual albedos than the hot Classicals and other TNOdynamical classes. The cold Classicals are known to be distinct from other TNOsin terms of their color distribution, size distribution, and binarity fraction.The Classical objects in our sample all have red colors yet they show adiversity of albedos which suggests that there is not a simple relationshipbetween albedo and color. As a consequence of high albedos, the mass estimateof the cold Classical Kuiper Belt is reduced from approximately 0.01 Earthmasses to approximately 0.001 Earth masses. Our results also increasesignificantly the sample of small Classical KBOs with known albedos and sizesfrom 21 to 32 such objects.

High Albedos of Low Inclination Classical Kuiper Belt Objects