PlanetPol was a ground based, high sensitivity polarimeter based at the William Herschel Telescope that has now been decommissioned. It was the most sensitive astronomical visual polarimeter ever built in fractional polarisation, a mantle that since its decommissioning now belongs to HIPPI. Although the device could be used for a wide range of astronomy, its primary use was the detection of extrasolar planets.
PlanetPol did not discover any extrasolar planets.
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