A robotic spacecraft sent to rescue a sinking NASA telescope got close enough to see its target.

It just did not have enough fuel left to save it.

Katalyst Space’s LINK spacecraft came within 15 kilometers — roughly nine miles — of NASA’s Neil Gehrels Swift Observatory last weekend, after the planned capture and orbital boost had already been called off.

LINK used its sensors to photograph Swift and collect data for NASA before turning away.

That is a brutal ending for a mission that came within sight of its goal.

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The Associated Press reported the closest-approach details Friday:

LINK’s flight controllers had spent weeks fighting an attitude-control failure that sent the spacecraft into an uncontrolled spin. They managed to slow the tumble and stabilize the vehicle, but the recovery burned through fuel reserved for the final rendezvous, robotic capture and long-duration orbit-raising maneuver that would have extended Swift’s life.

The turnaround bought back control while spending the propellant the rescue depended on. That tradeoff left LINK able to approach Swift but unable to raise it.

Two of the three reaction wheels used to point the spacecraft had also stopped working, leaving controllers dependent on thruster burns that consumed the same limited propellant needed to move the telescope hundreds of miles higher and keep it operating for years.

Katalyst CEO Ghonhee Lee summed it up in eight words: “We got so close, but so far.”

The spacecraft still gathered proximity data and images that could matter for future servicing missions. Lee said another close pass is unlikely because of LINK’s remaining fuel.

The photos and sensor readings were sent to NASA, giving engineers a rare close look at how an autonomous servicing vehicle approaches an uncooperative target in orbit.

The machine can continue testing its three robotic arms before it reenters and burns up in the atmosphere, which the company expects within roughly a month.

The $30 million mission was assembled in only nine months because Swift’s orbit was falling faster than anticipated. Lee said the compressed schedule forced the team to use parts that were available instead of waiting for every preferred component.

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NASA and Katalyst treated the flight as a high-risk experiment with useful data to gain even if the rescue failed. They also had to avoid a collision that could scatter debris through low Earth orbit.

The nine-mile approach quickly spread through local news feeds Friday:

NASA Science documented the recovery effort on July 31:

A series of thruster burns reduced LINK’s spin from about nine degrees per second to less than four. NASA and Katalyst were still studying alternate paths to a boost, and the spacecraft was expected to approach Swift near the end of August. Those burns restored enough control for mission planners to keep working on the rendezvous.

That progress mattered because LINK had been designed for a difficult job: approach an aging telescope that was never built to be serviced, secure it with robotic arms and raise its decaying orbit. Swift has no docking port, refueling fixture or propulsion system capable of performing the boost on its own.

Every pound of propellant used to regain control reduced what remained for the rescue itself.

NASA said there were still possible paths forward at that point, but the fuel calculation kept getting worse. The recovery burns had made the spacecraft controllable enough to continue approaching Swift while steadily shrinking the margin for lifting the observatory.

By the time LINK reached its target, the navigation demonstration was still possible. The boost was not.

Katalyst Space had reported early commissioning milestones on July 15:

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The company said LINK launched aboard a Northrop Grumman Pegasus XL on July 3 and established communications, deployed its solar arrays and checked out its power, avionics and propulsion systems. Mission controllers also encountered attitude-control and communications anomalies as they brought the spacecraft online.

Katalyst built and launched LINK less than a year after NASA selected the company for the rescue. Lee later told the AP that the nine-month rush forced engineers to use available components instead of waiting for preferred parts.

NASA paid about $30 million for the attempt. That sounds like a large sum until it is compared with replacing a productive space telescope and launching an entirely new mission.

On August 19, NASA announced that the attitude-control problem had finally ruled out the capture and boost.

Friday’s reports showed how narrow the remaining gap became:

That decision did not end the close-approach demonstration. It changed the mission from rescue to rehearsal.

LINK would no longer grab Swift or push it higher. It would practice the navigation and proximity work that future spacecraft will need if orbital servicing becomes routine.

Swift launched in 2004 to hunt gamma-ray bursts and other violent events in the universe. Recent solar activity increased atmospheric drag in low Earth orbit, pulling the observatory down faster than expected.

The telescope has no propulsion system capable of lifting itself back to a safer altitude.

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NASA expects Swift to reenter sometime between October and the end of 2026, depending in part on the sun. The agency had paused observations earlier this year to conserve power while the rescue plan was being prepared.

Even with the mission lost, Swift returned to work.

NASA shared one of its latest observations Thursday:

Two of Swift’s telescopes resumed science operations during the last week of August. NASA said the team hoped to restore the third instrument as well.

The observatory was still making images as recently as August 26, recording X-ray photons from the remnant of Tycho’s supernova while its orbit continued to decay.

There is a larger lesson in the near miss.

Satellites have traditionally been launched as sealed machines: they work until they run out of fuel, lose a critical system or fall from orbit. LINK was built around a different idea — send another machine to meet them, inspect them and eventually move them.

NASA Administrator Jared Isaacman said the mission was worth flying despite the result because the agency will learn from it.

The stakes extend beyond Swift. Katalyst is developing a next-generation servicing spacecraft that could one day boost the Hubble Space Telescope, whose orbit has also been lowered by solar activity.

Swift may still be lost. But a robotic spacecraft chased it down, recovered from a spin, flew within nine miles and looked it in the eye.

That is failure measured in miles — and experience that the next rescue crew will not have to learn from scratch.

Featured image: Kieran Wilson and Hunter Robertson stand beside the LINK spacecraft during thermal-vacuum testing at NASA’s Goddard Space Flight Center on April 17, 2026. Photo: NASA/Sophia Roberts.

This is a Guest Post from our friends over at WLTReport. View the original article here.

 

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