Kinematic Distance of Galactic Planetary Nebulae
  We construct \HI~absorption spectra for 18 planetary nebulae (PNe) and their
background sources using the data from the International Galactic Plane Survey.
We estimate the kinematic distances of these PNe, among which 15 objects'
kinematic distances are obtained for the first time. The distance uncertainties
of 13 PNe range from 10% to 50%, which is a significant improvement with
uncertainties of a factor two or three smaller than most of previous distance
measurements. We confirm that PN G030.2-00.1 is not a PN because of its large
distance found here.
