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Hubble Space Telescope images obtained in 2018 are combined with archival HSTdata taken in 1995 to detect changes and measure proper motions in the HH 80/81shock complex which is powered by the fastest known jet driven by a formingstar, the massive object IRAS 18162-2048. Some persistent features close to theradio jet axis have proper motions grater than 1,000 km/s away from IRAS18162-2048. About 3 to 5 parsecs downstream from the IRAS source and beyond HH80/81, H-alpha emission traces the rim of a parsec-scale bubble blown by thejet. Lower speed motions are seen in [Sii] away from the jet axis; thesefeatures have a large component of motion at right-angles to the jet. Weidentify new HH objects and H2 shocks in the counterflow opposite HH 80/81. Thenortheastern counterflow to HH 80/81 exhibits an extended but faint complex of2.12 um H2 shocks. The inner portion of the outflow is traced by dim 1.64 um[Feii] emission. The full extent of this outflow is at least 1,500" (about 10pc in projection at a distance of 1.4 kpc). We speculate about the conditionsresponsible for the production of the ultra-fast jet and the absence ofprominent large-scale molecular outflow lobes.

HH 80/81: Structure and Kinematics of the Fastest Protostellar Outflow