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We have calculated improved photonic passbands for the UBV RI, Hipparcos andTycho Hp,BT,VT standard systems using the extensive spectrophotometriclibraries of NGSL and MILES. Using the Hp passband, we adjusted the absoluteflux levels of stars in the spectrophotometric libraries so their synthetic Hpmagnitudes matched the precise Hipparcos catalog value. Synthetic photometrybased on the renormalized fluxes were compared to the standard UBVRI and BT, VTmagnitudes and revised synthetic zero-points were determined. The Hipparcos andTycho photometry system zero-points were also compared to the V magnitudezero-points of the SAAO UBVRI system, the homogenized UBV system and theWalraven V B system. The confusion in the literature concerning broadbandmagnitudes, fluxes, passbands and the choice of appropriate mean wavelengths isdetailed and discussed in an appendix.

Spectrophotometric Libraries, Revised Photonic Passbands and Zero-points for UBVRI, Hipparcos and Tycho Photometry