NASA Swift Telescope Is Falling
by: Marcus Webb

NASA’s Swift Telescope Is Falling. Guess Where?

Last updated: Nov. 1, 2026. Forecasts for this re-entry are revised as tracking data comes in, and the times below will change.

NASA’s Neil Gehrels Swift Observatory is expected to fall out of orbit within days, and no one can yet say where. The latest tracking message on Space-Track, issued early on November 1, puts re-entry around 00:30 UTC on November 4, according to the tracking site KeepTrack. The Associated Press reported on October 31 that the U.S. Space Force expected it on or around Friday, which SatNews reads as November 6.

The 1.5-ton telescope has spent 22 years in orbit. Science News describes it as falling uncontrollably. We found no date, location or risk assessment for the fall on NASA’s Swift pages, which were last updated October 26.

Three forecasts, days apart

Forecast Source Issued
Nov. 4, 00:30 UTC, with a 35-day window around it Space-Track message, via KeepTrack Nov. 1
On or around Friday, read by SatNews as Nov. 6 U.S. Space Force, via AP Oct. 31
Within a few weeks NASA Oct. 23

We read the Space-Track figures through KeepTrack and the Space Force estimate through outlets citing AP, not from the originals. The 840-hour window on the Space-Track message is the number to watch. KeepTrack says a window that wide means the location is unknown, and that it will shrink as new messages arrive. Swift’s mean altitude was 235.2 kilometers on November 1, the site says, down from 349.5 kilometers on August 23.

A band around the equator, mostly ocean

Swift’s orbit is tilted 20.5 degrees from the equator, so it can only come down between about 20.5 degrees north and 20.5 degrees south. Both KeepTrack and Dean Sladen, an aerospace engineer at the U.K. components supplier Accu Components who spoke to Space.com, describe that limit. The continental U.S., Canada and Europe lie outside it.

Inside it are parts of Africa, northern Australia, India, Southeast Asia, and Central and South America, according to reports citing AP. Sladen told Space.com the band is mostly ocean, and AP-based reports say any wreckage will most likely land in water.

The Space-Track message does list a point, 17.1 degrees north and 170.9 degrees east, in the Pacific. KeepTrack cautions that this only shows where Swift would be at the nominal time and is not a forecast of where debris would fall. Swift circles the planet every 89.1 minutes, so an error of an hour moves the answer thousands of kilometers.

Tungsten, mirrors and reaction wheels

Most of Swift should burn up. Brad Cenko, the mission’s principal investigator at NASA’s Goddard Space Flight Center, told AP that some dense tungsten pieces and parts of its mirrors could survive, according to outlets citing the interview. Sladen’s list is a little different. He expects the six reaction wheels, which aimed the spacecraft, and tougher telescope parts such as lenses and mirrors to be the likeliest survivors, with “nothing recognizable as a telescope” reaching the surface.

Darren McKnight, a senior technical fellow at the tracking company LeoLabs, told Space.com that Swift will likely break up enough not to pose a casualty hazard, though parts of its X-ray and optical telescope might survive.

Sladen said no detailed risk assessment appears to have been published. NASA’s debris rules cap the risk of human casualty at one in 10,000, he noted, so the work has probably been done, and he told Space.com he thinks it should be released.

The rescue that ran out of fuel

NASA gave Katalyst Space a contract, worth $30 million according to The Register, to catch the telescope with a robotic spacecraft called LINK and push it higher. It launched in early July on what Space.com called the final flight of the Pegasus rocket.

Weeks later LINK’s maneuvering gear malfunctioned, Science News reported. Katalyst stabilized the spinning craft with its main engines, and that used up too much fuel to save Swift. NASA and Katalyst called off the boost on August 19. Science News also reported that the job was meant as a preview of a similar mission to the Hubble Space Telescope.

At the time, Cenko told Science News that modeling pointed to re-entry in late November or December, and sooner if the team resumed science.

It did.

NASA says the return to observing raised the drag on the spacecraft and it began sinking quickly. On October 20 Swift reached 275 kilometers and went into safe mode, and the operations team at Penn State sent the command that effectively ended its work.

A telescope built to turn in about a minute

Swift launched on November 20, 2004, on a mission planned for two years. Gamma-ray bursts, the most powerful explosions in the cosmos, faded before large telescopes could point at them. Swift could find one, report its position to other observatories and swing its own telescopes around in about a minute, Cenko said in NASA’s announcement.

In May 2005 that speed produced the first rapid, precise location of a short gamma-ray burst, GRB 050509B, which lasted 0.03 seconds. NASA counts more than 2,000 gamma-ray bursts, more than 1,400 supernovae and about 7,000 published papers. In 2017, Science News notes, Swift took part in the discovery of light from two merging neutron stars and in tracing a neutrino to its origin for the first time.

Nothing lined up will replace all of that. Judith Racusin, a NASA Goddard astrophysicist, told Science News that scientists will lose “the really rare, unusual ones,” meaning the events they tend to learn the most from. NASA says it is looking at existing telescopes, commercial options and new missions to keep up rapid response in what its astrophysics director, Shawn Domagal-Goldman, called “a post-Swift world.” NASA’s blog for the mission is at science.nasa.gov/blogs/swift.

Sources

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