NASA’s Swift Observatory Reactivates Instruments for Final Science Mission Before Atmospheric Reentry

SCIENCE

Instruments reactivated for a final hurrah before reentry

NASA’s Neil Gehrels Swift Observatory is now considered beyond rescue, yet the mission team has reactivated its instruments to gather a final period of scientific data before the spacecraft reenters Earth’s atmosphere.

The ultraviolet/optical and X‑ray telescopes were turned back on last week, and the team aims to resume Burst Alert Telescope operations in September. Both telescopes had been powered down in February to reduce drag while a re‑boost was attempted, and the BAT was shut down in April to lower power use and reposition the solar arrays for additional drag mitigation.

The re‑boost attempt failed when control issues on the Katalyst Space LINK spacecraft prevented a capture and rescue operation. LINK is now raising its own orbit and plans to begin relative phasing with Swift, though no grappling is expected.

Consequently, Swift is slated for atmospheric reentry within the next few months, possibly as early as October, though the exact date remains uncertain. Mission managers have concluded that the scientific value of the extended observations outweighs the loss of additional orbital lifetime.

Swift has been observing the cosmos for over two decades and remains fully functional, but it cannot raise its own orbit. Heightened solar activity has intensified atmospheric drag, prompting a high‑risk rescue mission launched several months ago to extend its operational life.

NASA reports that low‑drag operations have kept Swift above the critical 185‑mile (300‑kilometer) altitude threshold through October; below this level, the descent rate would increase and any rescue attempt would become impractical.

“With the resumption of science observations, the team expects Swift to cross that altitude threshold within the next one to two months,” NASA stated.

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