space medium Fill in the Blank

Star trackers determine spacecraft attitude by matching observed star patterns against an onboard _______.

  1. Gyroscope database
  2. Star catalogue
  3. GPS ephemeris
  4. Sun sensor array

Answer: Star catalogue

Star trackers image star fields, compare centroids to stored catalogue entries, computing quaternion attitude with arcsecond accuracy.

Topic Space Technology - Sensors
Exam Relevance ISRO Scientist Exam, SSC CPO
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