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We present an astrometry study of the radio source VLA 1 at the core of theHH 111 outflow using new data (2007) as well as archival observations(1992-1996). All data were taken at 3.6 cm with the Very Large Array in itsmost extended (A) configuration. The source VLA 1 has undergone a dramaticmorphological change, showing a one-sided knot ejection in the 2007 epoch. Wealso report on the detection of a 3.6 cm compact continuum source (VLA 3)located at (-10.6",98.7") from VLA 1. No significant absolute proper motionswere found for VLA 1 and VLA 3 and the upper limits are consistent with thosefound for (embedded) radio sources in the Orion Nebula. We favor theinterpretation that in the continuum at 3.6 cm we are observing two nearlyperpendicular jets. HH 111 presents a new case of one-sided jet ejection in ayoung stellar object. The Galactic (or extragalactic) nature of VLA 3 remainsunclear.

A one-sided knot ejection at the core of the HH 111 outflow