  New images from the Hubble Space Telescope of the FRII radio galaxy Pictor A
reveal a number of jet knot candidates which coincide with previously detected
radio and x-ray knots. Previous observations in x-ray and radio bands show the
entire jet to be 1.9' long, with interesting variability, but an optical
component was previously unknown. The discovered optical component is faint,
and knot candidates must be teased out from a bright host galaxy. Using three
broadband filters, we extract knot fluxes and upper-bounds on the flux for
multiple knot candidates at wavelengths of 1600nm, 814nm and 475nm. We find
that the data suggest that localized particle re-accleration events followed by
synchrotron emission could explain the observed knot candidates, but those
electrons could not supply enough x-ray flux to match prior observations. Our
data provide key evidence suggesting a second, higher energy electron
population which was previously hypothesized, but could not be confirmed.
