Iridium NEXT: The Flash-Free Replacement Constellation
What is Iridium NEXT?
Iridium NEXT is the second-generation satellite constellation developed by Iridium Communications to replace its original constellation. Launched between 2017 and 2019, this new array comprises 66 active satellites, with additional spares, designed to provide global voice and data communication services. The constellation is notable for eliminating the 'Iridium flares', bright flashes caused by sunlight reflecting off the original satellites' antennas, a feature that had become a favourite of satellite watchers.
Mission and Purpose
The primary mission of Iridium NEXT is to deliver reliable satellite communication services across the globe, including remote and maritime areas where traditional networks are unavailable. The constellation supports a range of services, from voice calls and data transmission to machine-to-machine communication. This capability is crucial for industries such as aviation, maritime, and emergency services. Iridium NEXT also plays a role in the Aireon system, which provides global aircraft tracking and surveillance, enhancing aviation safety.
Orbital Characteristics
Iridium NEXT satellites orbit the Earth at an altitude of approximately 780 kilometres in a near-polar orbit with an inclination of 86.4 degrees. Each satellite completes an orbit roughly every 100 minutes. The constellation is arranged in six orbital planes, each containing 11 operational satellites, ensuring complete global coverage. The NORAD IDs for these satellites range from 42070 to 44078. Detailed orbital parameters can be explored on the Orbital Radar satellite profile page for Iridium NEXT.
Significance and Legacy
Iridium NEXT represents a significant technological leap from its predecessor, offering enhanced bandwidth and more robust communication capabilities. Its deployment marked a pivotal moment in satellite communications, ensuring continuity of service and introducing new functionalities. The elimination of the Iridium flares, while a loss for sky enthusiasts, reflects the improved design and efficiency of the new satellites. The constellation's role in global air traffic management through Aireon further underscores its importance in modern aviation.
Current Status
As of 2026, the Iridium NEXT constellation remains fully operational, with all 66 primary satellites functioning as intended. The network continues to support a variety of communication services worldwide, maintaining its reputation for reliability and coverage. Spare satellites are in orbit, ready to replace any primary units if necessary, ensuring the constellation's longevity. For real-time tracking and operational status, the Iridium NEXT tracker on Orbital Radar provides up-to-date information.
