NASA ends Swift observations as atmospheric drag brings its mission to a close
NASA’s Neil Gehrels Swift Observatory made its final observation on October 20, ending a science mission that began after its 2004 launch. NASA said October 23 that increasing atmospheric drag had left the spacecraft unable to hold its telescopes steadily on targets and that re-entry was expected in the coming weeks.
News date: 2026-10-23 · Checked: 2026-10-25 (Asia/Bangkok)
NASA’s Neil Gehrels Swift Observatory made its final observation on October 20, ending a science mission that began after its 2004 launch. NASA said October 23 that increasing atmospheric drag had left the spacecraft unable to hold its telescopes steadily on targets and that re-entry was expected in the coming weeks.
Three key points
- Swift’s final science observation took place on October 20.
- NASA expects atmospheric re-entry in the next few weeks; no exact time or location is established here.
- The mission leaves a publicly available archive of nearly 22 years of observations.
Why observations stopped
The spacecraft reached an altitude of about 171 miles, or 275 kilometers, on October 20 and entered safe mode. NASA says recent solar activity had increased atmospheric drag; the Penn State operations team then sent a command ending operations in preparation for re-entry.
A planned high-risk servicing effort ended in August without an attempt to raise the observatory’s orbit. Swift subsequently resumed observations before drag again increased. The current announcement concerns the end of operations, not confirmation that the spacecraft has already re-entered.
An archive remains available to researchers
NASA credits Swift with observing more than 2,000 gamma-ray bursts and more than 1,400 supernova explosions. Its data contributed to about 7,000 published papers, according to the agency’s mission summary.
The archive spans roughly 12 terabytes and includes more than 1.5 million ultraviolet and optical images. NASA describes it as publicly available, giving U.S. researchers and the wider astronomy community continued access after the spacecraft stops collecting new data.
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