NASA astronaut Jessica Meir and ESA astronaut Sophie Adenot concluded a spacewalk outside the International Space Station at 3:29 p.m. EDT on Tuesday, Sept. 1, 2026, after 6 hours and 49 minutes, NASA station blogger Mark A. Garcia reported. The excursion was U.S. spacewalk 99, the 284th spacewalk supporting station assembly and maintenance, and the sixth all-female spacewalk in history.

During the EVA, Meir and Adenot installed a new retroreflector on the forward port of the Harmony module to support spacecraft navigation during rendezvous and docking. They replaced a high-definition camera on the station's truss and completed an exterior swab for microorganisms. They also partially installed jumper cables for electrical systems and began preparing the Alpha Magnetic Spectrometer's heat-rejecting radiator for a future replacement spacewalk.

Mission Control deferred installing the remaining AMS radiator guide studs so engineers can finish a plan on a later EVA. As the crew fell behind the timeline, controllers also shifted remaining jumper-cable work and other noncritical tasks to a later date.

Adenot had limited mobility in her left arm during the spacewalk. Meir inspected the suit and concluded the glove heater harness was likely catching in the left shoulder joint; unzipping the joint appeared to resolve the issue before the crew re-entered the airlock, Garcia wrote.

The EVA was Meir's seventh spacewalk and Adenot's third. Meir now ranks third among NASA women for career spacewalks, behind Peggy Whitson (10) and Suni Williams (9). Adenot wore the suit with red stripes as crew member 1; Meir wore the unmarked suit as crew member 2. They began the spacewalk at 8:40 a.m. EDT.

Sources