NASA’s Neil Gehrels Swift Observatory has reactivated two of its key instruments to continue cosmic observations despite an accelerating orbital decline caused by atmospheric drag.
- Swift’s two main telescopes resumed observations in late August.
- A planned orbital boost mission was scaled back after technical issues.
- Swift may only have a few months left above its critical operating altitude.
What happened
NASA’s Swift Observatory, which has been studying transient cosmic events for over two decades, recently faced a challenging situation as atmospheric drag hastened the loss of its orbit. The spacecraft’s orbit has been degrading faster than expected due to increased solar activity that caused Earth's atmosphere to expand, increasing drag on satellites in low Earth orbit. As a result, engineers had to shut down some instruments earlier this year to reduce power needs and configure solar panels to minimize the drag.
To counter the orbit decay, NASA partnered with Katalyst Space to launch a servicing mission named LINK designed to capture and lift Swift into a higher orbit. Although LINK launched successfully in July 2026, it experienced orientation control problems that forced cancellation of the capture and boost phase. Instead, LINK will perform proximity operations near Swift to test future in-space servicing technologies. Meanwhile, Swift’s Ultraviolet/Optical Telescope and X-ray Telescope were turned back on in late August, with the Burst Alert Telescope expected to resume soon.
Why it feels good
Despite the accelerated orbit decay and halted boost efforts, Swift’s return to science operations enables continued monitoring of dynamic cosmic phenomena. The observatory is a vital asset for capturing fleeting events like gamma-ray bursts quickly and coordinating observations with ground and space telescopes. Reactivating instruments ensures valuable data collection continues in this limited but important window.
Moreover, the LINK mission’s proximity maneuvers ahead of a docked boost demonstrate progress in satellite servicing technologies. These advances could redefine how aging spacecraft are maintained or upgraded in orbit, extending the productive lifespans of critical scientific instruments. Swift’s ongoing operation serves as both a frontline research platform and a testbed for future in-space missions.
What to enjoy or watch next
The scientific community and space enthusiasts can look forward to continued discoveries from Swift’s unique capabilities while it remains in its current orbit. Follow-up observations of transient cosmic sources detected by Swift will provide fresh insights into high-energy processes across the universe during the observatory’s final months at higher altitudes.
Keep an eye on updates regarding LINK’s test maneuvers near Swift, as they will inform future satellite servicing missions and strategies to mitigate orbit decay challenges. NASA expects Swift to drop below its critical altitude of approximately 185 miles within the next one to two months, so the focus will be on maximizing science output and technology demonstrations during this timeframe.