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The study measured a mean apparent magnitude of 6.28 for Project Kuiper satellites.
Lowering Project Kuiper satellites to approximately 590 km will decrease the time a satellite is visible during a single pass but increase apparent brightness for observers directly beneath the orbital path.
The study concluded that 92% of Project Kuiper satellites in their operational phase are brighter than the IAU’s research limit.
Project Kuiper’s planned fleet size is 3,236 satellites.
The IAU and NSF NOIRLab are expected to continue monitoring the Project Kuiper constellation as Amazon increases launch cadence toward an FCC mid-2026 deployment milestone.
Amazon engaged with the astronomical community early in Project Kuiper’s design phase and employed mitigation strategies to reduce satellite reflectivity.
Project Kuiper satellites operating at 630 km remain illuminated for longer periods during twilight than lower-altitude satellites.
The International Astronomical Union led a study finding that Amazon’s Project Kuiper satellites currently exceed brightness recommendations intended to protect ground-based astronomy.
Approximately 25% of the observations recorded Project Kuiper satellites bright enough to be seen with the unaided eye in dark-sky locations.
Satellite streaks from bright Project Kuiper satellites can saturate sensitive digital sensors and permanently corrupt data from wide-field surveys such as those conducted by the Vera C. Rubin Observatory.
Starlink satellites benefit from being in the Earth’s shadow for a larger portion of their orbit compared with Project Kuiper satellites operating at higher altitudes.
Starlink satellites are physically larger than Project Kuiper satellites and orbit at lower altitudes of approximately 550 km.
Amazon’s engineers have reduced reflectivity of Project Kuiper satellites compared with early prototypes.
TeraWave’s design emphasizes the network as infrastructure rather than focusing on end users, in contrast to LEO initiatives oriented primarily to residential and large-scale enterprise access such as Amazon Leo.
The mission designated LE-01 is the first of 18 planned launches with Arianespace for Amazon Leo.
Each Amazon Leo satellite is built at Amazon’s manufacturing facility in Kirkland, Washington and shipped to a processing facility in Cape Canaveral, Florida before traveling to Arianespace launch facilities in French Guiana.
Amazon Leo’s first Ariane 6 mission is currently slated for February 12.
The Oxford Economics report estimates Amazon Leo’s launch partnerships in France will support a cumulative €1.38 billion contribution to GDP and sustain an average of 1,590 jobs through 2029.
TeraWave's planned maximum subscriber base is far smaller than the markets targeted by SpaceX Starlink and Amazon Leo.
The Arianespace hybrid industrial cargo ship Canopée departed from Bordeaux, France earlier this month transporting Ariane 6 rocket components for Amazon Leo’s first mission.