PlanetPol
From Wikipedia, the free encyclopedia
PlanetPol was a ground-based, high sensitivity polarimeter based at the William Herschel Telescope[1] on the island of La Palma in the Canary Islands, Spain 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]