MERTIS/BepiColombo: the challenges of observing the Moon with an instrument designed for Mercury

The Mercury Radiometer and Thermal Infrared Spectrometer (MERTIS) is part of the ESA BepiColombo science payload en-route to Mercury. On April 10th 2020, BepiColombo flyby the Earth and obtain data from the Moon surface at a spatial resolution of 500 km. The MERTIS thermal-infrared spectrometer (TIS) has been designed to observe the surface of Mercury at a spatial resolution more than 1000 times better and at temperatures 2 times greater than that of the Moon. In this study, we present the performance of the MERTIS instrument and the quality of the data obtained during the Moon flyby.