Spacewalkers Successfully Deploy Solar Arrays

The 60-foot-long roll out solar arrays were successfully deployed over the United States in a process that took about 6 minutes.
The 60-foot-long roll out solar arrays are seen deploying as the space station soared over the United States in a process that took about 6 minutes.

Working together outside the International Space Station, ESA (European Space Agency) astronaut Thomas Pesquet and NASA astronaut Shane Kimbrough successfully connected and deployed a new ISS Roll-Out Solar Array (iROSA). It is the first of six total new iROSAs that will be installed in the coming years to upgrade the station’s power supply and is the first of two to be installed this week after the pair’s delivery aboard SpaceX’s cargo Dragon on the company’s 22nd commercial resupply services mission to the station.

The new solar arrays are being positioned in front of current arrays, which are functioning well but have begun to show signs of expected degradation as they have operated beyond their designed 15-year service life. The first pair of legacy solar arrays were deployed in December 2000 and have been powering the station for more than 20 years.

The new solar array is positioned in front of the current solar array on the same plane and rotary joints, but not directly on top of the primary solar arrays. The new arrays are 60 feet long by 20 feet wide (18.2 meters by 6 meters) and will shade a little more than half of the original array, which is 112 feet long by 39 feet wide. Each new iROSA will produce more than 20 kilowatts of electricity, while the current arrays generate, on average, 17 to 23 kilowatts each.

Boeing, NASA’s prime contractor for space station operations, its subsidiary Spectrolab, and major supplier Deployable Space Systems (DSS) provided the new arrays. The technology was developed and proven by NASA’s Space Technology Mission Directorate during a demonstration on the space station in 2017, and the same solar array design will be used to power elements of the agency’s Gateway lunar outpost.

Learn more about station activities by following the space station blog, @space_station and @ISS_Research on Twitter as well as the ISS Facebook and ISS Instagram accounts.

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