This year I organized together with Prof. Rudolf Dvorak, head of the Astrodynamical Group at the Institute for Astrophysics, the 9th Humboldt Colloquium on Celestial Mechanics. The meeting took place in Bad Hofgastein from 19.03.2017 to 25.03.2017. Over 50 participants from 16 countries all over the world contributed to the meeting with scientific talks about recent progress in the field of Celestial Mechanics. Selected papers of the meeting will be published in the scientific journal CM&DA soon. We thank Hotel Winkler, the sponsors, the scientific and local organizing committees, and all participants for their efforts to make the meeting a big success.