A Rescue Gone Wrong, 200 Miles Up
A refrigerator-size spacecraft designed to save a half-billion-dollar NASA observatory has itself become the thing that needs saving – and engineers are now working against the clock to pull it back from the edge.
What Link Was Built to Do
The satellite in question is called Link, built and operated by Katalyst Space Technologies, a satellite servicing startup based in the United States. NASA awarded Katalyst a $30 million contract to fly Link up to the Swift gamma-ray observatory – a $500 million asset that has been doing science in orbit since 2004 – grab onto it physically, and boost its decaying orbit before the mission ends and the spacecraft burns up on reentry.
Swift has survived longer than most missions its size. But orbital decay is physics, not negotiable, and aerodynamic drag at low Earth orbit eventually wins. The plan was for Link to act as an external thruster pack of sorts: dock with Swift, fire its engines to raise the observatory’s altitude, and buy NASA more operational years out of hardware that would otherwise be lost. It’s a concept the satellite servicing industry has been trying to prove out for years – the idea that a spacecraft doesn’t have to die just because its fuel runs low or its orbit softens.
Katalyst’s contract with NASA put real money behind that concept. Thirty million dollars is not a trivial figure for a startup, and Swift is not a trivial target. The observatory has detected thousands of gamma-ray bursts – some of the most energetic events in the known universe – since its launch. Losing it to orbital decay when a fix might be possible would be the kind of outcome space agencies spend decades regretting.
So when Link launched and began its approach toward Swift, the mission had weight behind it. Then, roughly one week ago, something went wrong.
Multiple Systems, Multiple Failures
More than 200 miles above the Earth, Link began spinning out of control. Not a slow drift – rotation on multiple axes simultaneously, the kind of tumble that makes everything else harder. A spacecraft spinning on multiple axes can’t hold a fixed orientation, which means its antennas sweep past ground stations in unpredictable windows rather than maintaining a steady link. Engineers on the ground found themselves trying to diagnose a sick satellite through sporadic, fragmentary radio contact. Every gap in communication was time lost.
The attitude control situation compounded fast. Link carries three reaction wheels – gyroscopic devices that spacecraft use to rotate and hold their pointing direction without burning thruster fuel. Two of the three stopped working. That left the satellite with one functioning reaction wheel trying to stabilize a tumbling vehicle on its own, which is not a configuration any mission is designed to operate in long-term.
Engineers also identified a problem with the cold gas thrusters, the system Link uses for finer attitude corrections. Cold gas thrusters are simpler than chemical propulsion – they work by expelling pressurized gas to produce small, precise forces – but they’re also the backup layer when reaction wheels fail. With both primary and secondary attitude control systems compromised simultaneously, the engineering team was left with limited tools and a satellite that wouldn’t hold still long enough to use them reliably.
What makes this situation particularly difficult to manage from the ground is the communications problem. Diagnosing hardware failures on a spacecraft requires sending commands, receiving telemetry, and building a picture of what’s happening onboard. When contact is sporadic – when the antenna geometry is wrong because the vehicle is tumbling – that diagnostic loop breaks down. Engineers can send a command and not know for hours whether it was received, executed, or ignored. The feedback cycle that normally makes spacecraft troubleshooting possible becomes jagged and slow.
The engineering team at Katalyst is working through that constraint now. The immediate goal is to slow the spin enough to restore consistent communication – because without stable contact, fixing anything else becomes nearly impossible. That means using whatever attitude control authority remains, likely the single functioning reaction wheel in combination with whatever the cold gas system can still contribute, to reduce the rotation rate and get Link’s antennas pointed at the ground long enough to run proper diagnostics. It is the kind of problem where every partial success opens the door to the next step, and every setback closes it again.
The SpaceX scrubbed Starship launch earlier this year – traced to engines that failed to start – showed how quickly launch-phase anomalies can cascade. Link’s situation is different in nature but similar in structure: a chain of overlapping hardware failures arriving faster than any single fix can address them.
What’s Still Possible
Katalyst has not declared Link lost. The satellite is still in orbit, still making partial contact with ground stations, and still theoretically capable of executing its mission if the attitude control situation can be stabilized. The $500 million Swift observatory is still up there, its orbit still slowly decaying, still waiting.
What the engineering team is working with now is a spacecraft that has already survived a week of tumbling – which is either a sign of durability or a sign that the situation hasn’t yet reached the point of no return, depending on how you read it. The cold gas thruster problem needs diagnosing. The two dead reaction wheels need evaluating for any recovery potential. And all of that has to happen through a communication link that only works when the geometry lines up. Whether Katalyst can thread that needle – stabilize the spin, restore contact, assess the damage, and still reach Swift – is a question with no clean answer yet.
