CHEOPS launched on board of a Soyuz-AT launch vehicle on 18 December 2019, at 08:54:20 UTC from Centre Spatial Guyanais (CSG) in Kourou, French Guiana. CHEOPS separated after two hours and 23 minutes from lift-off. The primary payload was the first satellite of ASI's COSMO-SkyMed Second Generation constellation, CSG 1. The launcher also deployed three CubeSats, including ESA's OPS-SAT. CHEOPS went into a altitude Sun-synchronous polar orbit.
