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Pi Mensae b
Pi Mensae b (π Men b, π Mensae b), also known as HD 39091 b, is an extrasolar planet〔 approximately 59 light-years away in the constellation of Mensa. The planet was announced orbiting the yellow subgiant star Pi Mensae in October 2001. == Detection and discovery ==
On October 15, 2001, a team of astronomers including Jones, Butler, Tinney, Marcy, Penny, McCarthy, Carter, and Pourbaix announced the discovery of one of the most massive extrasolar planets have yet been observed. It was discovered by the Anglo-Australian Planet Search team, using a Doppler spectrometer mounted on the Anglo-Australian Telescope.
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