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308 Polyxo is a main-belt asteroid that was discovered by A. Borrelly on March 31, 1891, in Marseilles. It is classified as a rare T-type asteroid.

Photometric measurements reported in 1983 give a rotation period of 12.03 hours and a brightness variation of 0.20 in magnitude. The adaptive optics instrument at the W. M. Keck Observatory shows an oblate object with a diameter of 130 km. The size ratio between the major and minor axes is 1.26 ± 0.11.<ref name="Marchis2006"/>


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