The ExoMars Trace Gas Orbiter is starting its science mission in April 2018, following a year-long aerobraking phase in Mars orbit. Preliminary results from the first operations in the final orbit may be available at the time of this meeting. We welcome presentations on all aspects of TGO observations, including their possible implications, and on any support activities, such as calibration, modelling and theory. We also encourage teams involved in the 2020 mission to present their plans for operations of their instruments, discussions on landing sites, and ideas or plans to use instruments in a synergistic manner to conduct sets of observations, whether on the surface, subsurface, or on the collected samples.