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We report the detection of a planetary companion orbiting the solar-type starHD 80606, the brighter component of a wide binary with a projected separationof about 2000 AU. Using high-signal spectroscopic observations of the twocomponents of the visual binary, we show that they are nearly identical. Theplanet has an orbital period of 111.8 days and a minimum mass of 3.9 M_Jup.With e=0.927, this planet has the highest orbital eccentricity among theextrasolar planets detected so far. We finally list several processes thisextreme eccentricity could result from.Comment: 4 pages, 1 figure included, submitted to A&A, final versio

HD 80606 b, a planet on an extremely elongated orbit