  We report a change in the trajectory of a well studied jet component of the
quasar 3C279. The component changes in apparent projected speed and direction,
and we find it to be moving with a Lorentz factor gamma >~ 15 at an initial
angle of <~ 1 degree to the line of sight. The new trajectory of the component
has approximately the same speed and direction as an earlier superluminal
feature, originally seen in the early 1970s. The new direction for the
component is also much better aligned with larger scale VLBA and VLA structure
out to 0.1 arcseconds. We suggest that the trajectory change is a collimation
event occurring at >~ 1 kiloparsec (deprojected) along the jet. While the
change in trajectory on the sky appears to be 26 degrees the intrinsic change
is <~ 1 degree. We estimate the Doppler factor prior to the change in direction
to be D >~ 28 and after the change to be D >~ 23. Comparison to independent
constraints on the Doppler factor suggest that the energy in the radiating
particles cannot greatly exceed the energy in the magnetic field unless the
volume filling factor is very much less than one.
