Analysis of classical Kuiper-belt objects and Haumea collisional family from the Herschel and Spitzer observations

We have analyzed space-based data at far-IR wavelengths in order to determine physical properties of Kuiper-belt objects (KBOs), also known as transneptunian objects (TNO), in the dynamical class of classical Kuiper-belt objects (CKBO). This dynamical class also contains most of the Haumea family members, the only known collisional family among TNOs. We observed 44 CKBOs in the Herschel open time key program ''TNOs are are Cool'' (Muller et al. 2009). We use Herschel/PACS/photometer data (70, 100, 160 μ m) combined with earlier Spitzer/MIPS (24 and 70 μ m) data when available. Additionally, half a dozen CKBOs have data only from Spitzer. We have re-examined absolute visual magnitudes based on various optical data in the literature. We determine sizes, geometric albedos and beaming factors using the radiometric technique. The CKBOs with radiometrically measured diameters are in the size range 130