Katalyst Space continues to operate its Link spacecraft in orbit to gather critical flight experience for future satellite servicing missions, despite abandoning plans to reboost a NASA gamma-ray observatory due to attitude control issues, according to company chief executive Ghonhee Lee.
Reaction Wheel Failures Force Mission Redesign
The Link spacecraft, launched in July, lost two of its three reaction wheels following unexpected thermal loading on power electronics, according to Ghonhee Lee. The component failures created severe attitude control problems that drained propellant reserves rapidly. Engineers attempted to compensate by gimballing the spacecraft’s main Hall-effect thrusters, but the workaround left the vehicle unable to maintain stable attitude control when the main engines were idle. Because the reaction control system relied on the same propellant supply, operators burned through fuel allocations too quickly to safely execute a meaningful orbital boost of NASA’s Swift observatory, which orbits at an altitude between 341 and 343 kilometers compared to Link’s altitude of 319 to 329 kilometers, as tracked by the Space Force’s Space-Track database.
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Katalyst Space engineers and NASA guidance, navigation, and control experts worked side-by-side around the clock during the anomaly, with team members sleeping in RVs in the parking lot to salvage the mission.
Shifting Objectives to Rendezvous and Imaging
Rather than abandoning the spacecraft entirely, mission controllers placed Link into a spin-stabilized mode to raise its orbit and approach the Swift observatory. Once the servicing vehicle closes the distance, operators plan to switch back to three-axis control using reaction control system thrusters to test rendezvous and proximity operations, according to Ghonhee Lee. The upcoming proximity phase will allow engineers to capture images of Swift and validate onboard sensor models against ground testing data over an estimated two-week testing timeline.
Applying Lessons to Future Satellite Servicing
The operational data gathered from the Link anomaly is already flowing into Katalyst Space’s broader portfolio of orbital maintenance projects. The 60-person company is currently developing several Nexus servicing spacecraft and recently secured a Space Force study contract for satellite deorbiting services. According to Ghonhee Lee, navigating the unexpected thermal and power challenges has significantly advanced the firm’s capabilities in robotic space operations and long-term orbital logistics.
Frequently Asked Questions
What caused the failure on the Katalyst Space Link spacecraft?
Unexpected thermal loading on power electronics caused switches to burn out, disabling two of the three reaction wheels on the spacecraft.
Is the Link spacecraft still attempting to dock with the Swift observatory?
How is NASA involved in the ongoing mission?
NASA provided guidance, navigation, and control subject matter experts who worked closely alongside Katalyst engineers to diagnose control issues and help salvage operational objectives.
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