The Science Operation and Navigation Center (SONC) at CNES in Toulouse, was in charge of the overall Rosetta Lander Navigation and science co-ordination.
The mission was composed of two phases:
- Landing Site Selection Process
- First Science Sequence
The Flight dynamics team, was working 24/7 during the last phase of the Rosetta mission. Every 48 hours, they had to recalculate the trajectories to feed it to the control unit.