Link (SRM, Swift Rescue Mission)

Link [Katalyst]

The Katalyst SRM (Swift Rescue Mission) is a U.S. satellite-servicing project developed by Katalyst Space Technologies to recover NASA’s Neil Gehrels Swift Observatory. The servicer called Link was intended to stabilize the orbit of the U.S.-built gamma-ray observatory, which has operated since 2004.

The mission aimed to prevent the uncontrolled reentry of Swift, whose orbit had decayed significantly after more than two decades in low Earth orbit. Atmospheric drag, enhanced by increased solar activity, accelerated the decay and gave the satellite a high probability of reentry in 2026. Loss of the spacecraft would remove a long-standing capability for detecting and characterizing gamma-ray bursts. Reboosting Swift would have extended observational coverage for high-energy astrophysics.

The rescue mission was intended to demonstrate precision rendezvous and proximity operations with a satellite not designed for capture. The servicer would autonomously approach Swift, inspect it, and perform controlled maneuvers to achieve a stable capture. A specialized robotic mechanism would attach to a structural feature of the spacecraft, allowing reboost without contact with sensitive instruments. The operation was intended to validate servicing methods for unprepared satellites and to support future on-orbit servicing concepts.

NASA contracted Katalyst Space Technologies, Flagstaff, Arizona, in September 2025 to develop the spacecraft. The company had less than one year to design, build, test, and launch the servicing spacecraft, designated LINK. The spacecraft was assembled at the company's facility in Broomfield, Colorado, and underwent testing there and at NASA's Goddard Space Flight Center in Greenbelt, Maryland. The mission was based on technologies originally developed for an in-orbit demonstration of rendezvous, proximity operations, and docking and contributed to the development of the planned NEXUS multi-mission servicing platform.

LINK has a launch mass of approximately 425 kg and deploys two solar arrays with a span of 6 m after launch. The spacecraft carries autonomous navigation systems, three robotic arms for non-cooperative capture, and three xenon-fueled ion thrusters using approximately 60 kg of xenon propellant. The propulsion system was designed to gradually raise Swift's orbit to approximately 600 km over a period of several months while maintaining precise attitude control during the maneuver.

The Neil Gehrels Swift Observatory is a three-instrument gamma-ray burst mission launched in 2004. Its structure lacks docking fixtures or grappling points, requiring the rescue servicer to identify suitable structural features for secure attachment. Swift remained fully functional, but its declining altitude placed it at risk of atmospheric reentry in the near term.

LINK was successfully launched on 3 July 2026 on the final flight of the Northrop Grumman Pegasus-XL rocket. The rocket was air-launched from Northrop Grumman's L-1011 Stargazer aircraft over the Kwajalein Atoll in the Marshall Islands and placed LINK into low Earth orbit. Following launch, the spacecraft began its commissioning phase and initially established communications and stable attitude control. By late July, however, attitude-control problems had developed, with two of LINK's three reaction wheels inoperable and some loss of functionality in its cold-gas thruster system. The spacecraft entered a multi-axis spin, while power and communications remained available.

During the following days, Katalyst used the xenon ion thrusters to reduce the spin rate from approximately 9° per second to about 4° per second. By 5 August, the rate had been reduced to 1.47° per second. Katalyst subsequently developed revised attitude-control software and uploaded a new flight software package on 11 August 2026 in an attempt to restore sufficient control for rendezvous operations.

By 19 August 2026, Katalyst and NASA had concluded that LINK could not be stabilized sufficiently to perform the planned capture and reboost of Swift. The spacecraft will nevertheless be used for limited rendezvous and proximity operations to demonstrate aspects of the servicing mission without attempting to capture Swift. The planned orbit-raising mission has therefore been abandoned, and Swift is expected to reenter the atmosphere later in 2026.

The failure resulted from the loss of attitude-control capability. The mission nevertheless provided an operational demonstration of a rapidly developed servicing spacecraft, autonomous navigation and proximity operations, and robotic servicing technologies intended for future missions. The experience is expected to contribute to the further development of Katalyst's planned NEXUS servicing platform.