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In the mapping of the local ISM it is of some interest to know where thefirst indications of the boundary of the Local Bubble can be measured. TheHipparcos distances combined to B-V photometry and some sort of spectralclassification permit mapping of the spatial extinction distribution.Photometry is available for almost the complete Hipparcos sample and MichiganClassification is available for brighter stars south of delta = +5 deg (1900).For the northern and fainter stars spectral types, e.g. the HD types, are givenbut a luminosity class is often missing. The B-V photometry and the parallaxdo, however, permit a dwarf/giant separation due to the value of the slope ofthe reddening vector compared to the gradient of the main sequence in a colormagnitude diagram, in the form: B-V vs. M_V+A_V = V+5(1+log(pi)), together withthe rather shallow extinction present in the Hipparcos sample. We present thedistribution of median A_V(l, b) for stars with Hipparcos 2 distances less than55 pc. The northern part of the first and second quadrant has most extinction,up to 0.2 mag and the southern part of the third and fourth quadrant theslightest extinction, 0.05 mag. The boundary of the extinction minimum appearsrather coherent on an angular resolution of a few degrees

Local Bubble. Extinction within 55 pc?