Assertion: satellite | /r/HasProperty | necessary
Facets:
value: to command the satellite
type: PURPOSE
Source sentences:
text: As a result, it was necessary to command the satellite to use its onboard rocket thrusters to move it into its correct orbit.
text: Early calculations showed that 77 satellites would be needed, hence the name Iridium, after the metal with atomic number 77.
text: When the Soviet Union disintegrated in 1991, twelve GLONASS satellites in two planes were operational; enough to allow limited use of the system (to cover the entire territory of the Union, 18 satellites would have been necessary.)