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IRS-1C spacecraft is the most advanced civilian remote sensing satellite built in India with a steering panchromatic camera having a ground resolution of 5.8 m. A passive thermal control system (TCS) augmented with manual and auto heaters are provided. The spacecraft completed four years of operation since 28th Dec'95. The TCS of the spacecraft has been very good. Temperature variation of the spacecraft is presented and discussed here. A nominal rise in temperature of the spacecraft observed is found to fit linear equation, and the same could be used to predict a conservative value of the temperature for the next few years.

A passive thermal control system is provided for the temperature control of the panchromatic camera of IRS-1C spacecraft. The camera with a spatial resolution of better than 10m and a revisiting capability requires a stringent thermal control system. The thermal design is based on mathematical models. This paper gives the details of the model and the predicted temperature distribution of the camera.