NASA Swift boost mission ends without raising observatory’s orbit

NASA said on Sept. 28, 2026 that a commercial mission to boost the orbit of its Neil Gehrels Swift Observatory concluded without raising the spacecraft's altitude, after the LINK servicing satellite built by Katalyst Space developed communications and orientation control problems in orbit. The agency said it and the Flagstaff, Arizona-based vendor gained experience that will benefit future in-space servicing programs.

What happened

NASA contracted Katalyst in September 2025 to attempt the mission, giving the company around one year to design, build, test and launch a satellite that would meet, grab and lift Swift, the agency said.

The LINK spacecraft launched from Kwajalein Atoll in the Republic of the Marshall Islands in July aboard a Northrop Grumman Pegasus XL rocket. NASA said Katalyst selected Pegasus as the best launch option for reaching the observatory on the mission's condensed timeline.

After reaching space and completing initial checkouts, LINK began experiencing intermittent communications losses and developed issues with its orientation control, according to NASA. Following around-the-clock troubleshooting by both teams, NASA and Katalyst agreed to scale back the mission to a series of technology demonstrations, including exercising LINK's xenon-powered propulsion system and its three robotic arms. NASA formally concluded its involvement on Sept. 3, and the spacecraft re-entered the atmosphere on Sept. 25.

Why Swift needed a boost

Swift launched in November 2004 to study gamma-ray bursts. NASA said spacecraft in low Earth orbit without propulsion systems gradually lose altitude to atmospheric drag, and that a period of increased solar activity magnified the effect on Swift.

"From the beginning, this was a high-risk, high-reward mission," said Shawn Domagal-Goldman, Astrophysics Division director at NASA Headquarters in Washington, who added that without intervention Swift was going to re-enter the atmosphere by year's end.

All decision-making and risk acceptance hinged on predictions showing the observatory sinking to an altitude of around 185 miles (300 kilometers) — described by NASA as the point of no return — in fall 2026.

Flying Swift to buy time

Flight controllers at Swift's Mission Operations Center at Penn State in University Park, Pennsylvania, worked to keep the observatory above the critical altitude. In December 2025 they began swapping around 25% of the daily science targets for sky positions that would minimize drag, and by February had switched over to that approach entirely, NASA said.

The agency said the team could not point too close to Earth, the Moon or the Sun without risking overheating the instruments, and that the most streamlined orientation tilted the observatory too close to the atmosphere. The balance struck kept Swift above the critical threshold for several months.

"These changes bought valuable time for the boost mission and can be carried forward for future NASA missions," said John Nousek, the mission director and professor of astronomy and astrophysics at Penn State's Eberly College of Science.

What the teams say they learned

NASA said the compressed schedule required a new form of agile project management, with Space Science Mission Operations staff at Goddard Space Flight Center in Greenbelt, Maryland, working with Katalyst on milestones and approval processes, and input from NASA's Engineering and Safety Center during integration and testing.

Katalyst CEO Ghonhee Lee said the company did not accomplish every objective but that in less than a year it went from mission concept to launching and operating what he described as the first commercial space robot.

NASA said it is capturing lessons learned from the effort to advance U.S. spacecraft servicing technology.

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