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We have made a serendipitous discovery of an enigmatic outflow source, IRAS05506+2414 (hereafter IRAS 05506), as part of a multi-wavelength survey ofpre-planetary nebulae (PPNs). The HST optical and near-infrared images show abright compact central source with a jet-like extension, and a fan-like sprayof high-velocity (with radial velocities upto 350 kms/s) elongated knots whichappear to emanate from it. These structures are possibly analogous to thenear-IR "bullets" seen in the Orion nebula. Interferometric observations at 2.6mm show the presence of a high-velocity CO outflow and a continuum source alsowith a faint extension, both of which are aligned with the optical jetstructure. IRAS 05506 is most likely not a PPN. We find extended NH3 (1,1)emission towards IRAS 05506; these data together with the combined presence offar-IR emission, H2O and OH masers, and CO and CS J=2-1 emission, stronglyargue for a dense, dusty star-forming core associated with IRAS 05506. IRAS05506 is probably an intermediate-mass or massive protostar, and the very shorttime-scale (200 yr) of its outflows indicates that it is very young. If IRAS05506 is a massive star, then the lack of radio continuum and the late G --early K spectral type we find from our optical spectra implies that in thisobject we are witnessing the earliest stages of its life, while its temperatureis still too low to provide sufficient UV flux for ionisation.

High-Velocity Interstellar Bullets in IRAS05506+2414: A Very Young Protostar