NASA’s Neil Gehrels Swift Observatory is scheduled to re-enter Earth’s atmosphere on Wednesday, November 4, at approximately 3:30 a.m.
An Uncontrolled Return After a Decades-Long Mission
Launched in November 2004, the roughly 3,200-pound spacecraft was designed for a two-year primary mission to study gamma-ray bursts, the most powerful explosions in the universe. Over its extended lifetime, Swift detected more than 2,000 gamma-ray bursts and 1,400 exploding stars, operating as a multi-tool for astronomers and serving as an early-warning system for other facilities like the Hubble and James Webb space telescopes, Hindustan Times reported.
The spacecraft’s descent was accelerated in recent years by increased solar activity, which heated the upper atmosphere and increased drag. By October 20, Swift had dropped to an altitude of less than 171 miles above Earth, where atmospheric drag prevented its instruments from holding steady on their targets. Ground controllers at Pennsylvania State University then sent the command to terminate its science operations and prepare for re-entry, El País reported.
The Failed Commercial Rescue
NASA awarded Arizona-based startup Katalyst Space a contract to send a robotic spacecraft to grab Swift and push it higher, Spaceflight Now reported. The 5-foot-tall LINK spacecraft launched on July 3 on a Pegasus XL rocket dropped from an aircraft near the Marshall Islands.
By August, however, a power switch tied to LINK’s reaction wheels failed, leaving the rescue craft tumbling once every 40 seconds and unable to get closer than about 12 to 15 kilometers to the telescope, The Daily Galaxy reported. NASA and Katalyst conceded the rescue had failed on August 19, and LINK itself re-entered Earth’s atmosphere in September, Hindustan Times noted.
As of Monday, the U. S. Space Force has predicted that NASA’s Neil Gehrels Swift Observatory will re-enter Earth’s atmosphere at approximately 3:30 a.m. EST on Wednesday, Nov. 4, 2026. NASA expects most of the spacecraft to burn up as it travels through the atmosphere, but some… pic.twitter.com/I4C7nAFQOR
— https://x.com/NASAWatch/status/2117325576092655675
Tungsten Components and Telescope Mirrors Survive Atmospheric Re-Entry
As Swift encounters the atmosphere at roughly 5 miles per second, most of the observatory is expected to burn up and vaporize. According to Brad Cenko, Swift’s principal investigator at Goddard Space Flight Center, tungsten components and parts of the telescope mirrors could survive the heat, CPG Click Oil and Gas reported.
Almost immediately after launch, Swift started discovering things,
said astrophysicist Lynn Cominsky of Sonoma State University in Rohnert Park, Calif. Over the next two decades, the spacecraft utilized a Burst Alert Telescope, an X-Ray Telescope, and an Ultraviolet/Optical Telescope to study cosmic objects and events.
We’ve known this day would come since before Swift was launched,
Penn State astronomer John Nousek told the Associated Press.
Once Swift falls to about 120 kilometers [75 miles], the end usually comes within a few minutes. The air in front of it heats up so much that the satellite will start to glow. Solar panels and antennas are typically the first to tear off, and at around 78 kilometers [48 miles], roughly eight times the height of a passing airliner, the main body breaks apart. Most of it will melt and vaporize,
Dean Sladen, of the British supplier Accu Components
Sladen noted that the observatory’s mask of around 52,000 tiny lead tiles will almost certainly melt, while six heavy reaction wheels and tougher telescope lenses and mirrors are among the items most likely to survive. Sladen added that what reaches Earth is typically small, dense, and heat-resistant, such as titanium, steel, and glass, leaving nothing recognizable as a telescope.
An October 31 G2 geomagnetic storm increased atmospheric drag, significantly advancing the re-entry date according to predictions tracked by Joseph Remis. Following the storm, updated decay predictions placed the re-entry around November 4.
Because of Swift’s low orbital inclination, the re-entry locations of any surviving fragments are limited to a tropical belt between 20.6 degrees south latitude and 20.6 degrees north latitude, NASA stated. NASA estimates the risk of harm to anyone on Earth at approximately 1 in 2,100. India is among the regions situated beneath this broad potential re-entry band, where regional tracking authorities such as the Indian Space Research Organisation monitor objects during their final orbits.
Update: obj. 28485 SWIFT decay prediction: November 04, 2026 UTC 05:31 ± 12h The October 31 G2 geomagnetic storm increased atmospheric drag, significantly advancing the re-entry date. pic.twitter.com/UpmnA2pO6j
— https://x.com/jremis/status/2116787896028213596
Swift delivered an incredible, lasting return on investment for the nation, designed for a two-year primary mission but productive for more than 10 times as long,
Shawn Domagal-Goldman, director of the Astrophysics Division at NASA Headquarters
Domagal-Goldman emphasized that the spacecraft far exceeded its initial expectations before ultimately succumbing to orbital decay. NASA noted that the complete public archive spans approximately 12 terabytes of scientific measurements, including more than 1.5 million images captured by its Ultraviolet/Optical Telescope.
We’re tracking the upcoming reentry of the Swift space telescope📡 The NASA Neil Gehrels Swift Observatory, launched in 2004 to study space objects and events, is now on its return to Earth. Aerospace's Center for Orbital and Reentry Debris Studies has just released an updated… pic.twitter.com/mmq09B1FZ7
— https://x.com/AerospaceCorp/status/2117390029425353194