Reaction wheel failures leave Swift rescue mission spinning in orbit

The commercial effort to save NASA’s aging Swift gamma-ray telescope has hit a major obstacle. Katalyst Space Technologies, the firm contracted to boost the orbit of the 22-year-old observatory, reports that its Link satellite is currently facing critical hardware issues. Ground controllers confirmed that two of the three reaction wheels on the Link spacecraft are no longer operational. These components are essential for maintaining stable attitude control while in orbit.

In addition to the wheel failures, the satellite is dealing with decreased functionality in its cold gas thruster system. This combination has left the spacecraft in an uncontrolled spin and caused intermittent communications with teams on the ground. Despite these setbacks, the Link satellite remains powered and in contact with its operations center, which provides a window for engineers to address the situation.

Engineers at Katalyst are now looking at alternative solutions to regain control. The team is evaluating the use of the satellite's xenon-fueled electric thrusters to stabilize the attitude of the spacecraft. These thrusters were designed for orbit-raising maneuvers rather than attitude correction, so this shift represents a significant change to the original mission parameters.

NASA selected Katalyst for this $30 million rescue mission to test the viability of the commercial satellite servicing industry. The agency required a rapid nine-month turnaround from contract to launch, a timeline that pushed technical limits. NASA officials noted that the attempt itself is already a milestone for the industry, regardless of the ultimate success of the rendezvous with Swift.

For now, the focus is on stabilizing Link before any further attempt to capture the Swift observatory can proceed. The team intends to update the guidance and navigation software on the satellite to match its current status. Once the health of the spacecraft is fully assessed, NASA and Katalyst will determine whether a safe approach to the target is still possible.