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We investigate the surface characteristics of the large dwarf planet (136199)Eris. With the FORS1 instrument of the ESO VLT, we have obtained Bessellbroadband R linear polarimetry and broadband V and I photometry. We havemodelled the observations in terms of the coherent-backscattering mechanism toconstrain the surface properties of the object. Polarimetric observations ofEris show a small negative linear polarization without opposition surge in thephase angle range of 0.15-0.5 degrees. The photometric data allow us to supposea brightness opposition peak at phase angles below 0.2-0.3 degrees. The dataobtained suggest possible similarity to the polarimetric and photometric phasecurves of Pluto. The measured absolute magnitude and broadband colors of Erisare H_V=-1.15, V-R=0.41, and V-I=0.75.

Polarimetry of the dwarf planet (136199) Eris