Giotto spacecraft during the solar simulation test

Giotto spacecraft during the solar simulation test in May 1985. During the test, the spacecraft was spinning at 10 rpm. The solar radiation was simulated by 36 lamps with a total power that varied from 1250 to 1800 Watts/m² and an aspect angle that varied from 35° to 130° to simulate the effect of the Sun on the spacecraft during the various phases of the mission for verification of the thermal model.