The forward looking camera is powered first, followed by the nadir and each aft looking camera, such that HDEV video ‘follows’ a location on the Earth as ISS passes overhead. HDEV operates one camera at a time and is designed so that when the system is initially powered on, after a 1-2 minute warm up period, the cameras are turned on one at a time in a repeating cycle. When the station is in darkness, video may appear black. ISS orbits our planet once every 90 minutes and experiences a sunrise or a sunset about every 45 minutes.
The cameras, made by four different companies – Hitachi, Panasonic, Sony and Toshiba, are enclosed in a temperature specific housing and are exposed to the harsh radiation of space.Īnalysis of the effect of space on the video quality may help NASA engineers decide which cameras are the best types to use on future missions. HDEV placed four commercial HD video cameras on the exterior of the International Space Station (ISS).
NASA’s High Definition Earth Viewing experiment (HDEV) is now live-streaming views of our planet from space captured by HD cameras.
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