Final Departure from the Orbital Laboratory
After a successful six-month mission, the private, uncrewed cargo spacecraft Cygnus XL is scheduled to depart from the International Space Station (ISS) today, October 9. The freighter, operated by Northrop Grumman, will conclude its tenure at the orbiting outpost, and spectators can follow the event live.
According to the mission schedule, the station's robotic arm, Canadarm2, is set to release the spacecraft at 12:45 p.m. EDT (16:45 GMT). Coverage of the departure is provided by NASA, with the broadcast commencing at 12:30 p.m. EDT (16:30 GMT).
Mission Profile and Legacy
Known as the S.S. Steven R. Nagel, this vessel marks the 24th Cygnus mission overall and the second iteration of the enhanced "Cygnus XL" line. The spacecraft was named in honor of the late NASA astronaut Steven R. Nagel, who participated in four space shuttle missions between the 1980s and 1990s.
Launched on April 11 via a SpaceX Falcon 9 rocket, the S.S. Steven R. Nagel delivered approximately 11,000 pounds (4,990 kilograms) of critical supplies and scientific equipment to the ISS. As it prepares for its final journey, it is loaded with thousands of pounds of waste collected from the station. The spacecraft is expected to burn up in Earth's atmosphere during reentry on Sunday, October 11.
Operational Differences and Disposal
The disposal method for the Cygnus XL is consistent with several other resupply vehicles, including the Russian Progress and the Japanese HTV-X, which are designed to incinerate upon reentry. This differs from the SpaceX Dragon cargo capsule, the only current resupply craft capable of returning hardware to Earth via parachute-assisted splashdown.
Furthermore, the Cygnus spacecraft utilizes a distinct docking procedure. Unlike vehicles that dock autonomously, the Cygnus is captured and berthed by the Canadarm2 robotic arm.
"Canadarm2 will detach the S.S. Steven R. Nagel from the Earth-facing port of the ISS' Unity module and then maneuver it into position for release," as stated by NASA officials. The entire operation will be commanded from ground control, with NASA astronaut Luke Delaney observing the procedure from the station.