NASA's Northrop Grumman Commercial Resupply Services 23 Departure

Why It Matters

The departure confirms the seamless integration of commercial cargo services with NASA’s ISS program, ensuring continuous supply flow and safe waste disposal while reinforcing international crew collaboration.

Key Takeaways

• Cygnus “William McCool” departs ISS after 175‑day mission.
• Release executed by Canadarm2, followed by 6‑minute burn.
• Deorbit scheduled March 14, burning trash over Pacific Ocean.
• Coordination involved NASA, Northrop Grumman, ESA astronaut Sophie Adeno.
• Safety zones keep‑out sphere and approach ellipsoid ensured safe separation.

Summary

NASA’s Johnson Space Center broadcast live the departure of the Cygnus cargo vehicle S.S. William McCool, marking Northrop Grumman’s 23rd Commercial Resupply Services mission to the International Space Station. After a 175‑day docked stay delivering thousands of pounds of science experiments, supplies, and waste, the spacecraft was released from the station’s Canadarm2 at 6:06 a.m. Central time, initiating a 6‑minute‑42‑second departure burn that propelled it beyond the keep‑out sphere and approach ellipsoid. The operation involved a coordinated team: Flight Director Garrett Hayden oversaw the sequence, Capcom Erin Edwards served as the primary voice to ESA astronaut Sophie Adeno monitoring from the Cupola, and robotic console specialist Casey Chen managed the arm. Safety protocols required go/no‑go polls, verification of the keep‑out sphere (200 m radius) and the larger approach ellipsoid (4 km × 2 km × 2 km) before the burn, ensuring the vehicle’s trajectory remained clear of the station. Notable moments included the crew’s confirmation of configuration checks, the precise timing of the release, and the final acknowledgment that Cygnus had successfully exited the keep‑out sphere. The vehicle, named after astronaut William McCool, will remain in orbit for roughly 24 hours before a controlled deorbit on March 14, where it will burn up over the Pacific, disposing of accumulated trash. The successful departure underscores the reliability of commercial partnerships for ISS logistics, highlights the role of multinational crews in real‑time operations, and demonstrates a proven method for waste disposal via re‑entry. As commercial resupply contracts continue, such missions validate the operational cadence and safety standards essential for future deep‑space endeavors.

Original Description

Watch with us as Northrop Grumman's Cygnus XL cargo spacecraft departs from the International Space Station.

Northrop Grumman’s Commercial Resupply Services 23 mission launched into space on Sept. 14, 2025, carrying supplies and science experiments to the orbiting laboratory. This mission was the first flight of the larger, more cargo-capable version of the solar-powered spacecraft.

The uncrewed Cygnus XL spacecraft will be clasped by the space station's Canadarm2 robotic arm and is scheduled to be released from the station at 7 a.m. EDT (1100 UTC) on March 12, 2026.

Learn more about the mission: https://www.nasa.gov/mission/nasas-northrop-grumman-crs-23/

Credit: NASA