5 Conclusion

We have presented in this paper an up-to-date compilation of all known galactic PNe radial velocities. After averaging all available data, 90$\%$ of the kinematics data of the 867 PNe of the catalogue have accuracies better than 20 kms^-1. We evaluated the kinematical parameters of the PNe differential galactic rotation by a least-square method and established the rotation curve of the Galaxy for 3.2<R<12.8 kpc. We found no significal trend for an increasing in the external rotation curve. The rotation of the bulge is found to be (9.9 $\pm$ 1.3) km$\,$s$^{-1}\,$deg^-1.

Acknowledgements

We are deeply indebted to Bjorn Stenholm for his participation in some of the observations. It's a great pleasure to thank Sylvie Beaulieu for generously providing us her bulge velocities before their publication. We also thank François Cuisinier for making some of his data available to us.