Calathus is a proposed student-designed Ceressample-return mission, that would consist of an orbiter and a lander with an ascent module. The orbiter would be equipped with a camera, a thermal imager, and a radar; the lander will have a sampling arm, a camera, and a gas chromatographmass spectrometer. Mission objective is to return maximum 40 g of Ceresian soil. The mission was designed and proposed in 2018 with support of ESA.
Spacecraft should take samples from Occator Crater, that was studied and photographed by NASA's Dawn. The objectives are:
to understand whether Ceres contains ingridients for life
to understand where Ceres was formed
to understand whether asteroids like Ceres were responsible for delivering water and organics to Earth
"The Calathus Mission" (PDF). Alpbach Summer School.
"SAMPLE RETURN FROM A RELIC OCEAN WORLD: THE CALATHUS MISSION TO OCCATOR CRATER, CERES" (PDF). 51st Lunar and Planetary Science Conference (2020). 2021.
^Gassot, Oriane (April 2021). "Calathus: A sample-return mission to Ceres". Acta Astronautica. 181: 112–129. doi:10.1016/j.actaastro.2020.12.050.
^ abc"The Calathus Mission Concept to Occator Crater at Ceres: Science, Operations and Systems Design" (PDF). ESA.