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Target RA (J2000): 164.189407 and deg Target Dec (J2000): 9.67390 and deg Gaia GMag: 12.152 Programme ID: CH_PR230026 PI of observing programme: Edwards Title of programme: Ephemeris Refinement of Key Targets for the ESA-Ariel Mission Abstract: The ESA-Ariel mission seeks to observe the atmospheres of around 1000 exoplanets. To maximise the science yield of the mission the sample of planets studied must be as diverse as possible probing all areas of the exoplanet population. To allow for this the catalogue of planets from which the Ariel sample is chosen must be significantly larger. For each of these potential targets a likely requirement is that number of key parameters are well characterised. One piece of knowledge that is undeniably obligatory is the predicted transit time of the planet in question. Keeping track of such a large number of worlds necessitates a well-structured follow-up programme and so the Ariel consortium has launched ExoClock which allows professional and amateur astronomers from around the world to support this effort. Nevertheless there are some planets which simply cannot be studied from the ground and for which TESS data is also of insufficient quality so another solution is required. Here we propose to use the excellent photometric performance of CHEOPS to study 9 key worlds for the Ariel mission. By observing these targets CHEOPS will be ensuring they are available for future atmospheric characterisation and thereby providing key support for another ESA mission. [truncated! Please see actual data for full text]