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Trans-Neptunian objects (TNO) represent the leftovers of the formation of theSolar System. Their physical properties provide constraints to the models offormation and evolution of the various dynamical classes of objects in theouter Solar System. Based on a sample of 19 classical TNOs we determineradiometric sizes, geometric albedos and beaming parameters. Our sample iscomposed of both dynamically hot and cold classicals. We study the correlationsof diameter and albedo of these two subsamples with each other and with orbitalparameters, spectral slopes and colors. We have done three-band photometricobservations with Herschel/PACS and we use a consistent method for datareduction and aperture photometry of this sample to obtain monochromatic fluxdensities at 70.0, 100.0 and 160.0 \mu m. Additionally, we use Spitzer/MIPSflux densities at 23.68 and 71.42 \mu m when available, and we present newSpitzer flux densities of eight targets. We derive diameters and albedos withthe near-Earth asteroid thermal model (NEATM). As auxiliary data we usereexamined absolute visual magnitudes from the literature and data bases, partof which have been obtained by ground based programs in support of our Herschelkey program. We have determined for the first time radiometric sizes andalbedos of eight classical TNOs, and refined previous size and albedo estimatesor limits of 11 other classicals. The new size estimates of 2002 MS4 and 120347Salacia indicate that they are among the 10 largest TNOs known. Our new resultsconfirm the recent findings that there are very diverse albedos among theclassical TNOs and that cold classicals possess a high average albedo (0.17 +/-0.04). Diameters of classical TNOs strongly correlate with orbital inclinationin our sample. We also determine the bulk densities of six binary TNOs.

"TNOs are Cool": A survey of the trans-Neptunian region VI. Herschel/PACS observations and thermal modeling of 19 classical Kuiper belt objects