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We report the detection of a Jupiter-mass planet discovered with the SOPHIEspectrograph mounted on the 1.93-m telescope at the Haute-Provence Observatory.The new planet orbits HD109246, a G0V star slightly more metallic than the Sun.HD109246b has a minimum mass of 0.77 MJup, an orbital period of 68 days, and aneccentricity of 0.12. It is placed in a sparsely populated region of the perioddistribution of extrasolar planets. We also present a correction method for theso-called seeing effect that affects the SOPHIE radial velocities. Wecomplement this discovery announcement with a description of some calibrationsthat are implemented in the SOPHIE automatic reduction pipeline. Thesecalibrations allow the derivation of the photon-noise radial velocityuncertainty and some useful stellar properties (vsini, [Fe/H], logR'HK)directly from the SOPHIE data.

The SOPHIE search for northern extrasolar planets III. A Jupiter-mass companion around HD 109246