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The Iridium satellite constellation is a large group of satellites used to provide voice and data coverage to satellite phones, pagers and integrated transceivers over Earths entire surface. Iridium Satellite LLC owns and operates the constellation and sells equipment and access to its services.
The constellation requires 66 active satellites in orbit to complete its constellation and additional spare satellites are kept in-orbit to serve in case of failure. Satellites are in low Earth orbit at a height of approximately 485 mi 781 km and inclination of 86.4�. Orbital velocity of the satellites is approximately 17,000 mph 27,000 kmh.