The Optical Star Pattern Stimulator (OSPS) from Jena-Optronik GmbH is a Star Tracker Simulator with Field of View 20 x 20 Degrees, Pressure 1 x 10^-6 mbar, Star Diameter 0.1 Degree (at 99%), Operating Temperature 10 to 30 Degree C. More details for Optical Star Pattern Stimulator (OSPS) can be seen below.