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Watch live: NASA spacewalk underway in ongoing solar array upgrade work

STORY WRITTEN FOR CBS NEWS & USED WITH PERMISSION

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Three days after a Russian spacewalk, Japanese space station commander Akihiko Hoshide and Frenchman Thomas Pesquet floated outside for their own excursion Sunday to build a support fixture for a roll-out solar array blanket that will be attached later.

The astronauts also planned to replace a device that measures the strength of the electrical environment around the International Space Station as it interacts with charged particles in the extreme upper atmosphere while streaking through space at nearly five miles per second.

Looking on throughout will be a 3D camera mounted on the space station’s robot arm that will capture high-definition shots of the spacewalk for use in a commercial documentary series — “The ISS Experience” — giving viewers an immersive look at life in orbit. The camera and robot arm will be operated by flight controllers in Houston.

“The procedures are developed in a way where the camera will be completely out of the path of the spacewalkers,” said flight director Ali Boudous. “We made sure that the camera gets some amazing views, however it doesn’t interfere at all with our spacewalk tasks themselves.”

Floating in the Quest airlock compartment, Hoshide, making his fourth spacewalk, and Pesquet, making his sixth, switched their spacesuits to battery power at 8:15 a.m. EDT, officially kicking off a planned six-and-a-half-hour excursion.

For identification, Hoshide, call sign EV-1, is wearing a suit with red stripes and using helmet camera No. 22 while Pesquet, EV-2, is wearing an unmarked suit and using helmetcam 20. Both astronauts also are equipped with new high-definition cameras.

Japanese astronaut Akihiko Hoshide works with a spacesuit inside the International Space Station in August. Credit: NASA

NASA is in the process of installing six new roll-out solar array blankets — IROSAs — to augment the space station’s eight original wings, which have degraded over the years and no longer generate the power they did when they were new.

The IROSA blankets are designed to be mounted on triangular frames made up of multiple struts.

Two IROSA blankets were installed on the left outboard set of arrays in June. Hoshide and Pesquet plan to assemble the support bracket for a left-side inboard IROSA array, which will be installed next year or in 2023. The remaining three IROSA’s will be installed on the right side of the power truss.

In any case, with the iROSA support frame in place, Hoshide and Pesquet plan to replace a device called a floating potential measurement unit, or FPMU, that has a failed power supply. The device, located just inboard of the left-side solar arrays, measures charges on the station from its interaction with the space plasma environment.

Astronaut Mark Vande Hei originally planned to join Hoshide for Sunday’s spacewalk, then scheduled for early September, but the outing was delayed after Vande Hei developed a pinched nerve in his neck.

In order to get the spacewalk video back to Earth aboard a SpaceX Dragon cargo ship at the end of September as originally planned, NASA managers decided to replace Vande Hei with Pesquet because they wear the same size suit and because Pesquet carried out three similar spacewalks in June.

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