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I will review our recent analysis of the magnetic properties of the O9IV starHD 57682, using spectropolarimetric observations obtained with ESPaDOnS at theCanada-France-Hawaii telescope within the context of the Magnetism in MassiveStars (MiMeS) Large Program. I discuss our most recent determination of therotational period from longitudinal magnetic field measurements and Halphavariability - the latter obtained from over a decade's worth of professionaland amateur spectroscopic observations. Lastly, I will report on ourinvestigation of the magnetic field geometry and the effects of the field onthe circumstellar environment.

A MiMeS analysis of the magnetic field and circumstellar environment of the weak-wind O9 sub-giant star HD 57682