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The William Herschel Telescope building

PlanetPol was a ground based, high sensitivity polarimeter based at the William Herschel Telescope[1] 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.[1]


PlanetPol did not discover any extrasolar planets.


  1. ^ a b Hough, J. H.; Lucas, P. W.; Bailey, J. A.; Tamura, M.; et al. (2006-09-01). "PlanetPol: A Very High Sensitivity Polarimeter". The Publications of the Astronomical Society of the Pacific 118 (847): 1302–1318. Bibcode:2006PASP..118.1302H. doi:10.1086/507955. Retrieved 2012-01-22.