The Mariner 6, Mariner 7, and Mariner 9 spacecraft carried thermal infrared radiometers, and a global map of thermal inertia was produced from modeled surface temperatures collected by the Infrared Thermal Mapper Instruments (IRTM) on board the Viking 1 and 2 Orbiters.
The Mariner 6, Mariner 7, and Mariner 9 spacecraft were equipped with thermal infrared radiometers. A global map of thermal inertia was created from modeled surface temperatures gathered by the Infrared Thermal Mapper Instruments (IRTM) aboard the Viking 1 and 2 Orbiters.