2471109

Target RA (J2000): 253.784821 and deg Target Dec (J2000): 20.49133 and deg Gaia GMag: 8.77 Programme ID: CH_PR240018 PI of observing programme: Nicholson Title of programme: Confirming the orbital parameters of a super-puff-host system to prepare for future atmospheric studies Abstract: The proposal request time to observe one transit each of HD152843 b and c an intriguing planet system hosting a super-puff sub-Saturn planet (planet c) alongside a Neptune-size planet of equal mass (planet b). These transit observations are crucial for precisely determining the orbits of these planets for future atmospheric characterisation. The improved radii and orbital parameters of the CHEOPS will in turn allow of better mass determination from an extensive RV campaign improving the bulk density and interior structure models and thus helping test the super-puff nature of planet c and improve the atmospheric characterisation from future atmospheric observations. [truncated! Please see actual data for full text]