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Extrasolar planetary transits are powerful tools to probe their atmosphereand to extract key physical properties of planets, like their mean densities,chemical compositions, or atmospheric structures. Every 3.5 days, the transitsof the gaseous planet orbiting HD209458 offer the opportunity to investigatethe spectral features of its atmosphere. We present here NUV transmissionspectroscopy of the transiting extrasolar planet HD209458b using HST/ACS. Weshow the data analysis of the seven HST orbits which were used to observe twotransits of HD209458b. Due to various remaining systematics, the radius of theplanet in the NUV could not be extracted with a high precison. However, wederived a radius of Rp=1.4Rjup+/-0.08 between 2800 and 3100 AA which isconsistent with previous measurements in the visible.

NUV radii of the extrasolar planet HD 209458b