Asteroid spectroscopy with Gaia

► We simulate spectroscopic observations of asteroids from Gaia mission. ► We calculate the SNR of these observations as function of asteroid magnitude. ► We find that all asteroids with H<15 (150,000 objects) can be spectrally classified. ► We describe the unsupervised classification algorithm that will be adopted. ► We tested the classification algorithm on a real case: the Nysa-Polana family.