The Redwire Fine Pointing Sun Sensor (FPSS) offers 2 measurement axes that enable high accuracy attitude determination. The unit is rad hard to 100 krad (Si).

Redwire's FPSS provides unambiguous sun angle data immediately upon application of power. The electronics unit contains no software, and performs without any internal forbidden states, latchup, or lost in space conditions. This system has performed reliably for more than 17 years each, for two separate solar observational missions. It is designed for continuous sun-stare operation.

Applications of the FPSS include:

  • High Accuracy Attitude Determination
  • High Resolution Sun Pointing

The FPSS has flight heritage on the following missions:

  • SMM
  • SOHO
  • GOES 16

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: 2022-04-21

Fine Pointing Sun Sensor



sensor: 0.95 g (nominal)
electronics: 1.08 kg
sensor: 15 mm
electronics: 20 mm
sensor: 10 mm
electronics: 13 mm
sensor: 7 mm
electronics: 6 mm
input voltage
28 ± 7 VDC (other ranges available)
field of view
±4.25° x ±4.25° (typical)
field of view accuracy
15 to 20 arcsec (typical)
radiation tolerance
100 krad


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