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Hu 1‐2 is a planetary nebula that contains an isolated knot located north‐west of the main nebula, which could be related to a collimated outflow. We present a subarcsecond H α +[N  ii ] image and a high‐resolution, long‐slit spectrum of Hu 1‐2 that allow us to identify the south‐eastern counterpart of the north‐western knot and to establish their high‐velocity ( &gt; 340 km s  −1  ), collimated bipolar outflow nature. The detection of the north‐western knot in Palomar Observatory Sky Atlas (POSS) red plates allows us to carry out a proper motion analysis by combining three POSS red plates and two narrow‐band H α +[N  ii ] CCD images, with a time baseline of  ≃ 57 yr. A proper motion of 20  ±  6 mas yr  −1   along position angle  312°± 15°  and a dynamical age of 1375 yr are obtained for the bipolar outflow. The measured proper motion and the spatio‐kinematical properties of the bipolar outflow yield a lower limit of 2.7 kpc for the distance to Hu 1‐2.

The collimated outflows of the planetary nebula Hu 1‐2: proper motion and radial velocity measurements ★