NASA scheduled U.S. spacewalk 99 for Sept. 1, 2026, to replace a spacecraft navigational aid and complete maintenance work on the International Space Station.

Key Details

• Jessica Meir and Sophie Adenot will replace a retroreflector on the forward port of the Harmony module to support spacecraft navigation during rendezvous and docking operations.
• The crew will install jumper cables for data-relay systems, prepare the Alpha Magnetic Spectrometer radiator for future maintenance, and replace a high-definition camera on the station's truss.
• Live coverage begins at 7 a.m. EDT; the spacewalk is expected to start at approximately 8:30 a.m. and last about six and a half hours.
• The excursion will be the 284th spacewalk supporting space station assembly, maintenance, and upgrades.

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