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We have carried out a thorough optical study of the closest star formationjet. The inner arcminute surrounding the class 0/I binary protostar L1551 IRS5and its associated jet (HH154) have been observed using the Hubble SpaceTelescope with the WFPC2 camera, the ESO New Technology Telescope with the EMMIspectrograph and the Nordic Optical Telescope with the ALFOSC spectrograph.This data set is compared to earlier ground based imaging with the aim to studythe evolution of this particular jet, and its possible interaction with themolecular material in the bipolar molecular outflow associated with thissource. The velocity field of the jet is mapped out. The highest velocities arefound in the vicinity of the recently discovered X-ray source emanating from ashock in this jet. The energy radiated by the X-ray source is compatible withthese velocities. The \halpha and \hbeta emission from the jet is used todetermine the extinction, which is found to increase inwards in the jet towardsthe protostar. The extinction towards the X-ray source is consistent with theone determined from the X-ray spectrum

HST and spectroscopic observations of the L1551 IRS5 jets (HH154)