Title: "Tachyon cosmology, supernova data and the Big Brake singularity"

I compare the existing observational data on type Ia Supernovae with the evolutions of the universe predicted by a one-parameter family of tachyon models. Among the set of the trajectories of the model which are compatible with the data there is a consistent subset for which the universe ends up in a new type of soft cosmological singularity dubbed Big Brake. I estimate the time necessary to reach this singularity.