2 PM and 2 AM temperatures of data within the landing site in December
2 PM and 2 AM temperatures of data within the landing site on December, 2, 1999. The plus sign marks the landing site. The thick white line shows the location of the polar layered deposits. Temperatures are given in Celsius. The temperature of CO2 frost (dry ice) on Mars is 145K (-128° C), approximately -200° F. Temperatures above 200K show the absence of CO2 frost. These temperatures were calculated from thermal radiation at a wavelength of 30µm.