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Last-Ever Pegasus XL Set to Launch June 27 to Save NASA's Falling Swift Telescope

Rocket and aircraft integration is complete for the June 27 air-launch of Katalyst's LINK servicer, riding the final flight of Northrop Grumman's Pegasus XL to reboost the sinking Swift Observatory.

Space & Aerospace Missions
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Overview

The robotic spacecraft NASA is counting on to rescue its falling Swift Observatory is now mated to its rocket and ready to fly. Katalyst Space Technologies’ LINK servicer will launch on a Northrop Grumman Pegasus XL air-launched rocket later this month from Kwajalein Atoll in the Marshall Islands, NASA wrote on its Swift mission blog. Liftoff is targeted for June 27, 2026, according to EarthSky — and the flight will be the last in the Pegasus program’s history. Per Wikipedia’s Pegasus entry, the booster flew 45 missions between 1990 and 2021, and the Swift boost is the final mission planned for the vehicle.

This is a follow-up to the May milestone the company cleared when LINK passed environmental testing at NASA Goddard, previously reported by The Machine Herald. In the weeks since, the program has moved from flight-ready hardware to a fully integrated launch stack staged half a world away.

What We Know

The launch campaign has hit its final pre-flight marks in quick succession. NASA reported that rocket integration was completed on June 10, that engineers attached the Pegasus XL to its carrier aircraft on June 12, and that the aircraft departed NASA’s Wallops Flight Facility in Virginia on June 19, per the agency’s Swift blog. The Pegasus XL is air-launched from Stargazer, a modified L-1011 airplane operated by Northrop Grumman, the same NASA post noted.

Once in orbit, LINK will attempt to rendezvous with Swift and raise its altitude to extend the observatory’s science mission, according to NASA. Swift was never built to be serviced, so LINK must capture it without pre-installed grapple fixtures: the roughly 880-pound (400-kilogram) spacecraft carries three robotic arms and uses optical cameras, LiDAR ranging sensors, guidance flight software, and real-time imaging to scan Swift and look for the ground-handling fixtures originally used to transport the telescope, New Atlas reported. After capture, LINK aims to lift Swift to about 373 miles (600 kilometers), buying the observatory what New Atlas described as “a comfortable number of years,” the same outlet wrote.

The urgency is driven by heightened solar activity, which has accelerated atmospheric drag and lowered Swift’s orbit faster than anticipated, NASA wrote. The observatory needs to stay higher than about 185 miles (300 kilometers) to keep operating, and without intervention it risks reentering Earth’s atmosphere this fall, according to EarthSky.

Katalyst says it designed, built, and tested LINK in just eight months, the company stated in announcing the integration. “The team designed, built, tested, and integrated a robotic spacecraft capable of performing one of the most ambitious commercial servicing missions ever attempted,” said Ghonhee Lee, CEO of Katalyst Space, in the same release. Brad Cenko, a research astrophysicist at NASA’s Goddard Space Flight Center and the Swift principal investigator, added: “We’re doing this on a time scale that’s kind of crazy by space standards,” per Katalyst.

Nicky Fox, associate administrator of NASA’s Science Mission Directorate, framed the contract as part of a broader push: “By moving quickly to pursue innovative commercial solutions, we’re further developing the space industry and strengthening American space leadership,” also per Katalyst. NASA held an audio-only media teleconference to preview the mission at 11 a.m. EDT on Wednesday, June 17, with speakers including Cenko, Katalyst LINK principal investigator Kieran Wilson, and Northrop Grumman’s vice president of launch systems, Wes Collier, the agency said.

The Last Pegasus

The rescue doubles as a farewell. Pegasus first flew on April 5, 1990, and the air-launched booster was carried by the L-1011 Stargazer — a converted airliner formerly owned by Air Canada — after it replaced an earlier B-52 carrier by 1994, per Wikipedia. The Swift mission uses the last Pegasus XL in Northrop Grumman’s inventory, the same entry notes.

Northrop Grumman cast the rapid, far-flung campaign as a showcase for the vehicle’s strengths. “Pegasus has been instrumental in launching science satellites over the years, and doing this as a rapid response mission from Kwajalein Atoll truly highlights what Pegasus can do: quick assembly, testing, and global repositioning,” said Steve Hollo, chief engineer of Pegasus, New Atlas reported.

What We Don’t Know

  • Whether LINK can complete an autonomous, non-cooperative capture of a satellite never designed to be grappled. The rendezvous and capture will unfold over time after launch, not on launch day.
  • How many years of additional life the boost will ultimately deliver. NASA and Katalyst materials reviewed for this article describe the extension only in general terms.
  • Whether the June 27 launch slot holds. NASA has confirmed the integrated stack departed Wallops and is staging at Kwajalein Atoll, but air-launch campaigns remain weather- and range-dependent.
  • Whether a successful Swift boost shifts NASA’s posture on commercial servicing for other aging science platforms.