  We present UV spectra of the protoplanetary nebula (pPN) Hen3-1475 obtained
with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space
Telescope (HST). Our deep, low-dispersion spectroscopy enables monochromatic
imaging of Hen3-1475 in UV nebular emission lines, the first of such attempt
ever made for a pPN. The high spatial resolution of STIS imaging allows an
unprecedentedly sharp view of the S-shaped jet, especially the inner NW1 knot,
which is resolved into four components in the MgII 2800 line emission. Through
critical comparison with HST optical narrowband images, we found a negative
radial velocity gradient in NW1, from -1550 km/s on its innermost component to
about -300 km/s on the outermost. Despite their high radial velocities, these
components of NW1 mostly show no obvious (or very small) proper motions,
indicating that they might be quasi-stationary shocks near the tip of the
conical flow along the collimated jet of Hen3-1475.
