Note that the errors on the proper motions are large (∼50mas/yr), and therefore the positions computed at an epoch different from 1991.25 have a large (∼0.4") uncertainty.
The Tycho Epoch Photometry data can be accessed from the morePhoto column (includes V_T, B_T and Hp photometric data for Hipparcos stars [HIPftr_576x310http://cdsarc.cds.unistra.fr/ftp/cats/I/239/filter.gif filter responses]