The Fine Sun Sensor (FSS) from Bradford Space is a Sun Sensor with Accuracy ±0.3 Degree, Sun Field of View 128 x 128 Degree(Nominal FOV), 138 x 138 Degree(Unobstructed FOV (To Be Free Of Straylight Sources), Mass 375 g, Radiation Tolerance 10 krad, Supply Voltage 0 to 5 V. Tags: Analog Sun Sensor. More details for Fine Sun Sensor (FSS) can be seen below.