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Asteroid (3200) Phaethon is a Near-Earth Apollo asteroid with an unusualorbit that brings it closer to the Sun than any other known asteroid. Its lastclose approach to the Earth was in mid-December 2017 and the next one will beon October 2026. Previous rotationally time-resolved spectroscopy of Phaethonshowed that its spectral slope is slightly bluish, in agreement with its B/Ftaxonomic classification, but at some rotational phases, it changes to slightlyreddish. Motivated by this result we performed time-resolved imagingpolarimetry of Phaethon during its recent close approach to the Earth. Phaethonhas a spin period of 3.604 hours and we found a variation of the linearpolarisation with rotation. This seems to be a rare case in which suchvariation is unambiguously found, also a consequence of its fairly largeamplitude. Combining this new information with the brightness and colourvariation, as well as previously reported results from Arecibo radarobservations, we conclude that there is no variation of the mineralogy acrossthe surface of Phaeton. However, the observed change in the linear polarisationmay be related to differences in the thickness of the surface regolith indifferent areas or local topographic features.

Rotational variation of the linear polarisation of the asteroid (3200) Phaethon as evidence for inhomogeneity in its surface properties