Pegasus XL rocket's final flight will attempt the first-ever capture of an unprepared satellite, to save NASA's Swift
Northrop Grumman's last Pegasus XL drops from its L-1011 carrier over Kwajalein Atoll at 10:23 UTC June 30, carrying Katalyst Space's LINK robotic servicing vehicle to grab NASA's 22-year-old Swift observatory and tow it to a stable orbit before atmospheric re-entry
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Summary
NASA's Neil Gehrels Swift Observatory, launched in November 2004 to study gamma-ray bursts and ultraviolet astronomy, faces uncontrolled atmospheric re-entry by late 2026 or early 2027 as its 20.6-degree-inclination orbit has decayed. Under a $30 million contract awarded to Katalyst Space Technologies in September 2025, the company built LINK, an 880-pound servicing vehicle carrying three robotic arms, ion thrusters and 20 feet of solar panels. LINK will grapple Swift's exterior structure and slowly tow it to a stable orbit over several months. The vehicle launches aboard the final Northrop Grumman Pegasus XL ever built, air-dropped from a modified L-1011 over Kwajalein Atoll in the Marshall Islands at 10:23 UTC June 30.
Why it matters
If LINK succeeds, it proves commercial in-orbit servicing can rescue satellites never designed for it, a capability that reframes the economics of space missions: aging assets can be extended rather than abandoned. The Pegasus XL's final flight also closes a 35-year chapter in air-launched orbital delivery. Failure means Swift re-enters within months, ending a telescope that made foundational contributions to time-domain astrophysics.
What to watch
- Whether LINK achieves first contact and successful grapple of Swift's unprepped structure, the mission's most technically novel step.
- Ion-thruster performance over the months-long reboost campaign.
- Whether the Katalyst model attracts follow-on servicing contracts from other agencies with decaying assets.