A thermal analysis has been conducted on thesatellite MIST to learn how well different temperature requirementsare met in its latest configuration. In the process botha geometrical and a mathematical thermal model have beenrefined and updated and new information regarding internal heatdissipation has been added. The three thermally most extremecases have been simulated using the software Systema-Thermicaand the results show that several units aboard are not within theirtemperature limits. Different possibilities to resolve the issues,including the use of passive thermal control, have been discussed