PANCINO, ELENAELENAPANCINO2020-05-122020-05-122016978-1-58381-890-91050-3390http://hdl.handle.net/20.500.12386/24739The Gaia mission is described, along with its scientific potential and its updated science perfomances. Although it is often described as a self-calibrated mission, Gaia still needs to tie part of its measurements to external scales (or to convert them in physical units). A detailed decription of the Gaia spectro-photometric standard stars survey is provided, along with a short description of the Gaia calibration model. The model requires a grid of approximately 200 stars, calibrated to a few percent with respect to Vega, and covering different spectral types.ELETTRONICOenConference paperhttp://aspbooks.org/custom/publications/paper/503-0243.html2016ASPC..503..243PFIS/05 - ASTRONOMIA E ASTROFISICA