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We present Spitzer (IRAC) images observations and a VLT 2.1micron image ofthe HH 212 outflow. We find that this outflow has a strong symmetry, withjet/counterjet knot pairs with Delta x less than 1 arcsec position offsets. Wededuce that the jet/counterjet knots are ejected with time differences Deltatau_0 approx. 6 yr and velocity differences Delta v_0~ 2 km/s. We also analyzethe deviations of the knot positions perpendicular to the outflow axis, andinterpret them in terms of a binary orbital motion of the outflow source.Through this model, we deduce a ~0.7M_solar mass for the outflow source, and aseparation of ~80 AU between the components of the binary (assuming equalmasses for the two components). Finally, using the IRAC data and the VLT2.1micron image we have measured the proper motion velocities, obtaining valuesfrom 50 to 170km/s.

The jet/counter-jet symmetry of the HH 212 outflow