  We present Spitzer (IRAC) images observations and a VLT 2.1micron image of
the HH 212 outflow. We find that this outflow has a strong symmetry, with
jet/counterjet knot pairs with Delta x less than 1 arcsec position offsets. We
deduce that the jet/counterjet knots are ejected with time differences Delta
tau_0 approx. 6 yr and velocity differences Delta v_0~ 2 km/s. We also analyze
the deviations of the knot positions perpendicular to the outflow axis, and
interpret 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 a
separation of ~80 AU between the components of the binary (assuming equal
masses for the two components). Finally, using the IRAC data and the VLT
2.1micron image we have measured the proper motion velocities, obtaining values
from 50 to 170km/s.
