Thermal requirements of space solar telescope and its analysis

In this paper, we will describe the conceptual thermal design of Space Solar Telescope (SST) and the requirement of it. SST will be placed into a 732km, 98.6 degrees inclination, solar inertial orbit. For observing the sun, the telescope adds greater flexibility in the control of the heater system. The set points for the telescope and all attached payload elements, and consequently spacecraft heater power requirements, the special thermal control requirement of the focus plane instrument will be discussed in this paper. The telescope temperature set point for flight operations is now at room temperature and therefore will allow mounting and alignment of the optical components to be done at the temperature for which they operate on orbit. The thermal analysis and the telescope heater sizing have built in margins to allow natural degradation of the thermal properties over three years of on orbit operations.