A device for thermal monitoring a piece of equipment, which is integrated on a craft placed in a forced vacuum environment, an outside part of the equipment projecting outside of a wall of the craft and being subjected to a solar radiation flux, includes an absorbent screen that is suitable for being placed between the outside part of the equipment and the wall of the craft, whereby this absorbent screen has--on at least one portion of its front face, designed to be placed on the side removed from the wall of the craft--an absorptivity .alpha..sub.SOLAR that is the largest possible in the field of solar radiation, coupled to a low emissivity .epsilon..sub.IR in the infrared spectrum. The absorbent screen is made of a very heat-conductive material and has--on at least a portion of its rear face, suitable for being oriented toward the wall of the craft--a high emissivity .epsilon..sub.IR in the infrared spectrum, typically greater than or equal to 0.7.