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The debut mission of Northrop Grumman’s new jumbo cargo spacecraft goes nicely.
The Virginia-based firm’s first “Cygnus XL” freighter arrived on the International Space Station (ISS) early this morning (Sept. 18), after a one-day delay.
The key second got here at 7:24 a.m. EDT (1124 GMT), when NASA astronaut Jonny Kim used the orbiting lab’s Canadarm2 robotic arm to grapple the Cygnus because the ISS flew about 260 miles (420 kilometers) above the Democratic Republic of Congo.
Not everything went smoothly. The Cygnus XL was supposed to reach the ISS on Wednesday morning (Sept. 17), but that plan was scuttled by a thruster issue. The Cygnus team overcame that problem, however, and got the freighter on track for a one-day-late rendezvous.
“It’s a very intricate planning exercise that we have to go through to arrive at Space Station and rendezvous in a very specific point in space,” Bill Spetch, NASA ISS operations integration manager, during the Thursday morning docking broadcast. “When we had a couple of issues with a couple of burns getting cut short, that caused that trajectory to be off, and so it takes some time to go replan that and make sure that we could arrive at station safely.”
NG-23 is special for several reasons. For starters, it’s the first mission of the Cygnus XL, which can carry considerably more cargo than previous Cygnus iterations. NG-23 just hauled about 11,000 pounds (4,990 kilograms) to the ISS, compared to roughly 8,500 pounds (3,855 kg) on earlier Cygnus flights.
The current mission is also the first Cygnus delivery in more than a year, since NG-21 reached the ISS in August 2024. The delay resulted from problems with NG-22: That mission was supposed to lift off in January but was pushed back to June due to avionics issues, then canceled altogether after the NG-22 Cygnus was damaged during transport to the launch site.
The NG-23 Cygnus honors a fallen NASA astronaut. The freighter is named the S.S. William “Willie” McCool, after one of the seven crew members who died in the 2003 space shuttle Columbia accident.
“His life continues to inspire us.” Kim said after spacecraft capture. “To see a ship bearing his name safely arrive at the station is a reminder that his courage and kindness are still circling our beautiful planet Earth.”
The cargo that NG-23 just delivered to the ISS is a diverse lot, according to NASA.
“Highlights of space station research and technology demonstrations, facilitated by delivery aboard this Cygnus XL, include materials to produce semiconductor crystals in space and equipment to develop improvements for cryogenic fuel tanks,” agency officials wrote in a mission description. “The spacecraft also will deliver a specialized UV light system to prevent the growth of microbe communities that form in water systems and supplies to produce pharmaceutical crystals that could treat cancer and other diseases.”
The S.S. William “Willie” McCool was berthed to the Earth-facing port on the station’s Unity module at 10:10 a.m. EDT (1410 GMT), the place it stay till March 2026, when it can depart and deorbit to deplete in Earth’s environment.
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