The ASTRO APS3 from Jena-Optronik GmbH is a Star Tracker with Altitude Accuracy 0.8 to 7 arcseconds(Random Error), Mass 1.8 Kg, Slew Rate 6 to 7 Degree/sec, Data Update Rate 8 to 16 Hz, Field of View 20 Degrees. More details for ASTRO APS3 can be seen below.