The UNIVAC Athena computer was the processor for ground commands to the HGM-25A Titan I intercontinental ballistic missile (ICBM) as part of Western Electric's missile guidance system. The Athena was the "first transistorized digital computer to be produced in numbers." Athena, consisting of ten cabinets plus console on a 13.5 by 20 foot (4.1 by 6 m) floor plan, computed Titan flight data to the necessary burn-out point to start a ballistic trajectory toward the target. On-board Titan attitude control rolled the missile to maintain the missile antenna aligned to the ground antenna. Computer outputs were transmitted to the missile from a ground transmitter a "quarter mile out" (400 m). Completed in 1957, the Athena weighed 21,000 pounds (11 short tons; 9.5 t).