Abstract
After a short review of the scanning characteristics of the S2/S68 experiment, the forthcoming bright star spectrophotometric catalogue is discussed, as well as the repartition in ecliptic longitude and spectral classes of the 1500-2000 stellar objects that will be selected. The reproducibility of the data from one observation to the next is demonstrated and the sensitivity degradation rate is shown to be lower than 8 % per year over the whole spectral range. The low noise and high absolute precision ( ± 10%) of the laboratory calibration finally complete the high precision of the data that will be included in the catalogue.