Abstract
Images of Progress cargo spacecraft (PCS) and areas around them were captured by the AZT-33IK optical telescope (Sayan Observatory of ISTP SB RAS) during sessions of the active Radar–Progress space ex-periment. We took images of exhaust and fuel jets when propulsion systems worked and after they were cut off, during fuel system purging. In different sessions of the experiment, PCS had different orientations relative to the telescope, thus allowing us to find some parameters of the observed phenomena. These parameters make it possible to determine instants of engine ignitions, to estimate velocities of the jets, and, if necessary, to control the geometry of the space experi-ment. The paper reports common features of optical signals from jets measured in these experiments.
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