The top secret URSALA, RAQUEL, and FARRAH satellites (2025)

Twenty HEXAGON satellites were launched from California between 1971 and 1986, with one failure. HEXAGON was a big photo-reconnaissance satellite, but often carried Program 989 subsatellites that were deployed in orbit. (credit: Peter Hunter) Stars in the sky: The top secret URSALA, RAQUEL, and FARR