Fig. 1. Typical structure of star sensor

Fig. 2. Design of thermostability experiment

Fig. 3. Details in vacuum tank

Fig. 4. Thermal control with multilayer cladding

Fig. 5. Auto-collimation outside vacuum tank

Fig. 6. Error analysis. (a) x axis or y axis error; (b) z axis error

Fig. 7. Distribution of temperature measurement point

Fig. 8. Changes of measuring coordinate system caused by baffle heating. (a) Thermal deformation removing frock part; (b) temperature of each measurement point

Fig. 9. Change of measuring coordinate system caused by mounting support heating. (a) Thermal deformation removing frock part; (b) temperature of each measurement point

Fig. 10. Optical axis drift with mounting surface temperature ranging from 17 ℃ to 23 ℃