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Thermal emission from Kuiper Belt object (136108) Haumea was measured withHerschel-PACS at 100 and 160 micrometers for almost a full rotation period.Observations clearly indicate a 100-micrometer thermal lightcurve with anamplitude of a factor of ~ 2, which is positively correlated with the opticallightcurve. This confirms that both are primarily due to shape effects. A160-micrometer lightcurve is marginally detected. Radiometric fits of the meanHerschel- and Spitzer- fluxes indicate an equivalent diameter D ~ 1300 km and ageometric albedo p_v ~ 0.70-0.75. These values agree with inferences from theoptical lightcurve, supporting the hydrostatic equilibrium hypothesis. Thelarge amplitude of the 100-micrometer lightcurve suggests that the object has ahigh projected a/b axis ratio (~ 1.3) and a low thermal inertia as well aspossible variable infrared beaming. This may point to fine regolith on thesurface, with a lunar-type photometric behavior. The quality of the thermaldata is not sufficient to clearly detect the effects of a surface dark spot.

"TNOs are cool": A survey of the trans-neptunian region. II. The thermal lightcurve of (136108) Haumea