Context :

Aims : We present new astrometric measurements of the components in the T Tauri system , and derive new orbits and masses .

Methods : T Tauri was observed during the science verification time of the new extreme adaptive optics facility SPHERE at the VLT .
We combine the new positions with recalibrated NACO-measurements and data from the literature .
Model fits for the orbits of T Tau Sa and Sb around each other and around T Tau N yield orbital elements and individual masses of the stars Sa and Sb .

Results : Our new orbit for T Tau Sa/Sb is in good agreement with other recent results , which indicates that enough of the orbit has been observed for a reliable fit .
The total mass of T Tau S is 2.65 \pm 0.11 M _ { \odot } .
The mass ratio M _ { Sb } :M _ { Sa } is 0.25 \pm 0.03 , which yields individual masses of M _ { Sa } = 2.12 \pm 0.10 M _ { \odot } and M _ { Sb } = 0.53 \pm 0.06 M _ { \odot } .
If our current knowledge of the orbital motions is used to compute the position of the southern radio source in the T Tauri system , then we find no evidence for the proposed dramatic change in its path .

Conclusions :