NASA spent $30 million to save Swift. Two reaction wheels ended the rescue

The rescue satellite, named LINK, launched on 3 July aboard a Northrop Grumman Pegasus XL rocket, according to NBC News. It carried three robotic arms and three xenon-fueled electric thrusters. Its job was to grab Swift and boost it high enough to escape reentry, Ars Technica reported on 20 August.

None of that will happen now.

Both NASA and Katalyst confirmed on Wednesday that "ongoing attitude control issues" have ended the boost attempt. Katalyst said in a statement that the spacecraft and the agency "are assessing what milestones remain ahead." The company still plans to approach Swift for a close-in navigation demonstration, if the satellite can manage it.

The timeline was the risk

Ars Technica reported that two of LINK's three reaction wheels stopped working. Those wheels control the spacecraft's orientation. Cold gas thrusters meant for finer pointing also had problems. That left the three low-impulse plasma thrusters as the only way to recover the spacecraft's attitude as it circled Earth at nearly 5 miles per second.

NASA said in July that LINK was rotating at about 9 degrees per second and that communications were sporadic. Engineers slowed the spin by firing thrusters this month. The underlying fault did not go away.

The schedule was always tight. NASA awarded the $30 million contract to the Arizona-based company less than a year before launch, and Katalyst built and launched a first-of-its-kind servicing spacecraft in nine months. Ars Technica noted that readying such a satellite usually takes several years. The compressed timeline forced engineers to tolerate technical risks they might otherwise have rejected.

Swift itself was the reason for the hurry. The observatory launched in 2004, far outliving its original two-year design, and it lacks thrusters to maintain its own orbit. Solar activity in 2024 heated Earth's upper atmosphere, increasing drag and accelerating the decay that made a rescue necessary at all. NASA had to launch by this summer to reach Swift before it fell too low. A failure mode that appeared six weeks after launch therefore ended the mission before any rendezvous could be attempted.

What the money bought

The observatory cost about $500 million, according to Ars Technica. Astronomers still depend on its combination of multi-wavelength instruments and agile pointing to locate gamma-ray bursts for follow-up observations by other telescopes. NASA has already paused Swift's science operations ahead of the rescue attempt, so the gap in high-energy observations is open now rather than later.

"We were all hoping for more science from Swift," Shawn Domagal-Goldman, director of NASA's astrophysics division, said in a statement. "But we knew the takeaways from this mission would be worthwhile either way."

The agency and the company are selling the attempt as a capability demonstration rather than a loss. NASA Administrator Jared Isaacman said the outcome "does not change why this mission was worth attempting." He added that NASA "should be willing to move quickly and take smart risks when the potential return is worth it." Katalyst CEO Ghonhee Lee said the company has "already learned a tremendous amount" and wants to build "a repeatable playbook to inform future rendezvous and proximity operations and satellite servicing."

That is a real market. Several US companies are working on satellite servicing, and rendezvous sensors and robotic arms are the technologies those missions need. But the same nine months that produced a launch also produced two dead reaction wheels. The lessons from LINK will be judged by whether the next servicing spacecraft flies with more margin, not less.