Keck I OSIRIS 100 mas pixel–1 data integrated over the H2 1–0 S(1) emission in MHO 3252 Y3. The image was rotated by 71.°5 to show the jet axis approximately vertical. MHO 3252 Y3 shows a well-collimated microjet with pronounced knot structure, indicating a variable jet ejection speed. The proper-motion vectors from 2012 to 2017, measured in the integration boxes outlined in yellow, are indicated by the white arrows. The proper motions are relative to the central star of MHO 3252 Y3, whose proper motion was measured in the box outlined in black. The emission knots are labeled in the same way as in Figures 6 and 7, and the approximate ejection date of each emission knot calculated from its distance and the average proper motion is indicated.