Swift boost mission

Swift is a three-instrument gamma-ray observatory launched in 2004.^[10] It monitors gamma-ray bursts (GRBs), detecting about one hundred per year^[1] and providing data to other observatories.^[8] Swift has cost $500 million to build, launch, and operate as of 2026^[update].^[11] It has a unique ability to quickly turn to observe GRBs before they fade,^[11] and with no planned replacement, its loss would significantly impede time-domain astrophysics.^[9][1]

Swift occupies a low Earth orbit with an original altitude of approximately 600 kilometers (370 mi), which has decayed since launch to approximately 400 kilometers (250 mi) due to atmospheric drag.^[10] Increased solar activity around the 2024 solar maximum expanded the Earth's atmosphere and accelerated the decay,^[11] with uncontrolled reentry anticipated by the end of 2026.^[8][9] Swift does not have a propulsion system of its own.^[10]

In August 2025, NASA awarded two companies, Cambrian Works and Katalyst Space Technologies, $150,000 each under Phase III SBIR contracts for concept design studies for a Swift orbit boost mission.^[12] In September, NASA awarded Katalyst with a $30 million SBIR Phase III contract to develop and launch a spacecraft to dock with Swift and boost its orbit.^[8] Katalyst beat out proposals from Starfish Space and a joint venture of Cambrian Works and Astroscale. In the award announcement, NASA official Shawn Domagal-Goldman said "Given how quickly Swift's orbit is decaying, we are in a race against the clock" to save it.^[8]

The $30 million contract is a very modest sum for the development and launching of a spacecraft;^[13][14][15] by comparison, Swift cost $250 million to build and launch in 2004.^[15] A Northrop Grumman Pegasus launch cost $28 million in 2021,^[11] though Katalyst reportedly obtained launch services from Northrop at a discount; the Pegasus used to launch LINK was originally built for another customer.^[16]

Katalyst, founded in 2020 and based in Flagstaff, Arizona was already planning a mission in 2026 to demonstrate its on-orbit servicing capability.^[11] The company has not previously flown a spacecraft, but Atomos Space, which Katalyst acquired in April 2025, has.^[17] The company will use the Swift rescue mission to reduce the technical risk of its planned geostationary multi-mission servicing spacecraft, NEXUS, planned for 2027.^[9][18]

The selection of a private enterprise for the Swift rescue mission represents a policy shift for NASA with respect to servicing in low Earth orbit, following the 2024 cancellation of the in-house OSAM-1 (formerly Restore-L) mission due to cost overruns.^[1][19]

Since February 11, 2026, most of Swift's science operations have been suspended in favor of pointing the spacecraft and its solar arrays to minimize drag and extend the orbit lifetime.^[20] By disabling instruments and relaxing a requirement to have its solar arrays pointing within ten degrees of the Sun, Swift's operators have been able to reduce its average cross-sectional area in the direction of flight by approximately thirty percent while remaining power positive.^[21] If Swift slips below approximately 300 km (190 mi), drag forces may make it impossible for the servicing spacecraft to dock and maintain control.^[11] As of mid-June^[update], modeling predicted Swift will remain above this critical altitude into at least October, three to four months beyond what was predicted prior to drag minimization efforts, leaving sufficient time for LINK to rendezvous and dock.^[4]: 23:00

Development of Katalyst's LINK spacecraft occurred under a greatly accelerated timeline,^[8][18] with environmental testing at Goddard completed on May 4, 2026, just eight months after contract award,^[10][8] and launch occurring two months later; a comparable mission would typically have a development time of twenty-four months from award to launch.^[18] Following environmental testing, the spacecraft returned to Katalyst's Broomfield, Colorado facility for additional testing.^[10] The Pegasus air-launch system was selected partly for its ability to launch into Swift's low, 20.6 degree inclination.^[22]

On June 5, the spacecraft arrived at Wallops Flight Facility in Virginia to be mated to the Pegasus XL rocket. Integration of the spacecraft and rocket was completed on June 9,^[23] mating of the rocket to the Stargazer aircraft was completed on June 12,^[24] and Stargazer departed Wallops on June 18 for the launch site at Kwajalein Atoll in the Marshall Islands,^[25] arriving June 25.^[26] Following launch scrubs for weather on June 30^[27] and July 1,^[28] and a scrub for a technical issue with the launch vehicle on July 2,^[29] the spacecraft was successfully launched on July 3, 2026, at 08:36 UTC.^[5] This was the last planned launch of a Pegasus rocket.^[5][30] Katalyst confirmed the day after launch that the spacecraft deployed successfully, and checkouts and commissioning had begun.^[31]

On July 15, twelve days after launch, NASA reported that spacecraft commissioning was about half complete, with power systems and avionics commissioned, and propulsion system checkouts performed. Early issues with communications and attitude control were addressed with patches to flight software and updates to operating procedures.^[32]

Katalyst originally anticipated post-launch vehicle checkouts to take two weeks, followed by two to three weeks for rendezvous and inspection of Swift, and one to two weeks for close approach and capture.^[38] A malfunction of LINK's attitude control system, and subsequent recovery efforts, have delayed this timeline, with rendezvous now anticipated in late August, around eight weeks after launch.^[34]

LINK is equipped with three parallel manipulator robotic arms, described as a "split Stewart platform",^[4] each equipped with lidar sensors and three-degree-of-freedom grippers.^[39][22] The boost can be performed with capture by one arm, but three offer better control.^[4]: 40:00

Swift was not designed for on-orbit servicing, and does not have a docking port or grappling fixtures. Instead, LINK will attempt to attach to ground-handling flanges on the bus.^[1][39] Upon approaching within tens of meters, the two spacecraft will perform tandem operations to allow for visual inspection of the intended and backup gripping points, to ensure they are unobstructed (such as by torn multi-layer insulation) before attempting to dock.^{[22][4]: 38:00} No close-out photographs of Swift's base are available,^[22] and prior experience with servicing missions to Hubble revealed that multi-layer insulation may become embrittled in the space environment, leading it to shatter on contact, which would risk damaging Swift.^[4]: 41:00

The docking procedure was validated in a robotic testbed on an air bearing table, with a full-scale model of Swift's base.^[4]: 46:00 Swift is described as "unprepared but cooperative" in that it is capable of coordinated attitude control to assist with inspection and docking.^[4]: 43:00 The docking procedure includes several go/no-go decision points requiring approval of both vehicles' operations teams, with the ability to abort and retry if necessary.^[4]: 47:00

Once docked, LINK will raise Swift's orbit over a period of about three months,^[38] using three Hall-effect thrusters with xenon propellant, gimballed to align with the center of mass of the stacked vehicles,^[22][40][41] as well as sixteen reaction control system thrusters.^[4]: 11:00 LINK will perform attitude control for the stack,^[42] despite being significantly less massive, at 425 kg (937 lb), than Swift, at 1,470 kg (3,240 lb).

Following the boost, LINK will undock and distance itself from Swift, which will require about a month for recommissioning before returning to science operations.^[38] LINK will potentially pursue additional test objectives. Before passivation, LINK will use its remaining fuel to decrease its altitude in order to accelerate its reentry.^[4]

Swift mission director John Van Eepoel has said "The Swift boost attempt is a fast, high-risk, high-reward mission".^[10] If successful, Swift's operational life is expected to be extended by at least ten years.^[22]

• 2026 in spaceflight
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