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Aims. We aim to determine far-infrared fluxes at 70, 100, and 160$\mu$m ofthe five major Uranus satellites Titania, Oberon, Umbriel, Ariel and Miranda,based on observations with the photometer PACS-P aboard the Herschel SpaceObservatory.  Methods. The bright image of Uranus is subtracted using a scaled Uranus pointspread function (PSF) reference established from all maps of each wavelength inan iterative process removing the superimposed moons. Photometry of thesatellites is performed by PSF photometry. Thermophysical models of the icymoons are fitted to the photometry of each measurement epoch and auxilliarydata at shorter wavelengths.  Results. The best fitting thermophysical models provide constraints forimportant thermal properties of the moons like surface roughness and thermalinertia. We present the first thermal infrared radiometry longward of 50$\mu$mof the four largest Uranian moons, Titania, Oberon, Umbriel and Ariel, atepochs with equator-on illumination. Due to this inclination geometry there washeat transport to the night side so that thermal inertia played a role,allowing us to constrain that parameter. Also some indication for differencesin the thermal properties of leading and trailing hemispheres is found. Wespecify precisely the systematic error of the Uranus flux by its moons, whenusing Uranus as a far-infrared prime flux calibrator.  Conclusions. We have successfully demonstrated an image processing techniquefor PACS photometer data allowing to remove a bright central source. We haveestablished improved thermophysical models of the five major Uranus satellites.Derived thermal inertia values resemble more those of TNO dwarf planets Plutoand Haumea than those of smaller TNOs and Centaurs.

Herschel-PACS photometry of Uranus' five major moons