NASA’s Rescue Mission To Save Swift Observatory

NASA’s Swift Boost mission is an unprecedented on-orbit servicing mission designed to save the ageing Neil Gehrels Swift Observatory from premature reentry into Earth’s atmosphere. If successful, it will be the first U.S. mission to capture and raise the orbit of a scientific spacecraft that was never designed to be serviced.

Why Swift needs rescuing

Swift was launched in November 2004 under the guidance of American Astrophysicist Neil Gehrels to detect and rapidly observe gamma-ray bursts (GRBs)—the universe’s most energetic explosions. Over more than two decades, it has also become an important observatory for studying:

Black holes
Neutron star mergers
Supernovae
Comets
Active galaxies
Other transient astronomical events

Although the spacecraft remains scientifically productive, its low-Earth orbit has been decaying much faster than expected because Solar Cycle 25 has produced unusually strong solar activity. This heats and expands Earth’s upper atmosphere, increasing drag on satellites in low orbit. Swift has no propulsion system to raise its orbit on its own.

The rescue mission

NASA awarded a $30 million contract to Arizona-based Katalyst Space Technologies to carry out the rescue.

The company developed a robotic servicing spacecraft called LINK specifically for this mission.

Its objectives are to:

Rendezvous with Swift in orbit.
Safely capture the observatory using robotic arms.
Attach securely despite Swift not having docking hardware.
Fire its own thrusters over multiple maneuvers.
Raise Swift from roughly 224 miles (360 km) to about 373 miles (600 km) altitude.
Release the telescope so it can resume scientific observations.

Why this mission is difficult

The mission presents several unique engineering challenges:

Swift was never designed for servicing.
It has no docking ports or grapple fixtures.
The spacecraft must be captured without damaging sensitive scientific instruments.
Precise relative navigation is required while both spacecraft travel at roughly 7.8 km/s (about 28,000 km/h) around Earth.
The orbital boost must be performed gradually while maintaining spacecraft stability.

Launch and mission timeline

According to NASA:

LINK was launched from Pegasus XL rocket released from a Northrop Grumman’s carrier aircraft (L-1011 TriStar) over the Pacific near the Marshall Islands.
After reaching orbit, LINK spends about one month approaching Swift.
Docking and capture operations follow.
Orbit-raising takes approximately 60 days.
If successful, Swift’s science mission can resume after the boost is complete.

Why NASA considers Swift worth saving

Although Swift is over 20 years old, NASA says it still offers capabilities that are difficult to replace:

It can detect gamma-ray bursts within seconds.
It automatically slews toward new targets extremely quickly.
It provides simultaneous gamma-ray, X-ray, and ultraviolet/optical observations.
It supports observatories worldwide by issuing rapid alerts for transient events.

Because of these unique capabilities, replacing Swift would cost far more than extending its life through servicing.

Broader significance

NASA views the mission as a technology demonstration for future in-space servicing. If LINK succeeds, similar spacecraft could:

Extend the lives of scientific observatories.
Refuel satellites.
Repair malfunctioning spacecraft.
Remove or relocate satellites.
Support future lunar and deep-space infrastructure.

The technologies demonstrated could also influence future servicing of larger observatories.

Current status (July 2026)

The LINK rescue spacecraft has been launched and is on its way to rendezvous with Swift. The mission team expects approximately a month for rendezvous, followed by capture and a series of orbit-raising maneuvers over about two months. If all goes as planned, Swift’s operational lifetime could be extended by at least five years, and the mission would become a landmark demonstration of commercial satellite servicing.