What temperature is required to kill off the covid 19 virus. is this a body temperature or an external temperature. ?

Temps: From a study from Microbiology Society from 1985 coronavirus had the following characteristics. In environments with low humidity and and low temperature 6 degree celsius (41F) the virus lasted 86 hours in the air. In temperatures of 20 degrees celsius (68F) and more humid the virus lasted 3 hours. In a recent article the ideal temperature for virus is 8.7 Celsius (47.8 F)