The Redwire Coarse Analog Sun Sensor (CASS) contains a 2-segment solar cell for attitude determination. Each cell segment generates a short circuit current (ISC) proportional to illumination intensity. These two currents are processed at the spacecraft level to indicate sun angle α and sun presence. The CASS unit is Rad hard to more than 100 krad (Si). It is characterized by 1 measurement axis, and can be delivered with or without a built in amplifier.

Key applications of Redwire's CASS include:

  • Solar-Array Pointing
  • Sun Acquisition
  • Fail-Safe Recovery
  • Satellite Despin

The CASS has flight heritage on a slew of space missions, including:

  • AKATSUKI (Venus Climate Orbiter)
  • ETS-5
  • GALAXY 16
  • GOES
  • GPM
  • MOS-1
  • MOS-2
  • SCS-1

Sun Sensors are export controlled through an ECCN (Export Control Classification Number) issued by the United States Department of Commerce, ECCN 7A104. Export shipment requires successful application for an export license. Redwire is AS9100D/ISO 9001 certified.

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Last updated: 2021-11-22

Coarse Analog Sun Sensor (CASS)



45 g
approximately 68 g (with built in amplifier)
length excluding connector
51 mm
width excluding connector
25 mm
height excluding connector
18 mm
25 mm (with built in amplifier)
+12 VDC to +15 VDC (with built in amplifier)
field of view
±40° (can be modified to meet specific fov requirements)
radiation tolerance
100 krad


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