NASA's Swift telescope expected to re-enter Earth's atmosphere on 4 November

Re-entry window

NASA's Neil Gehrels Swift Observatory is expected to re-enter Earth's atmosphere on Wednesday, 4 November. NASA's own estimate puts the event at about 3:30 a.m. Eastern time, which is 9:30 Italian time, with an uncertainty of 11 hours either way. The latest calculation from The Aerospace Corporation gives 11:12 Italian time, with a margin of about 8 hours. An earlier Aerospace Corporation estimate put the time at 10:11 Italian time with a margin of 12 hours. The independent tracking service Satflare narrowed the window to plus or minus 6 hours around 10:57 Italian time.

Possible impact zone

Because the orbit is inclined at about 20.6 degrees to the equator, the possible re-entry band runs roughly between 20.6 and 21 degrees north and south of the equator. That band crosses parts of Africa, Asia and Latin America, and much of it is ocean. The window is still too wide for forecasters to name a precise landing area. Satflare's reference point for atmospheric entry, set at 80 kilometres of altitude, lies in the southern Pacific east of Papua New Guinea, near the Tokelau islands.

Debris and risk to people

NASA expects most of the spacecraft to burn up during re-entry, though some components may survive and reach the ground. The observatory weighs about 3,200 pounds, or roughly 1.5 tonnes, and measures 5.6 meters (18.4 feet) high and 5.4 meters (17.7 feet) wide, with much of that width made up of its deployable solar arrays. NASA says the risk of surviving components causing any harm is low. Luigi Bignami told Fanpage.it that the probability of fragments avoiding burn-up is very limited. NASA and the US Armed Forces are monitoring the falling telescope and will update their predictions as needed.

How the rescue failed

According to Wired, increased solar activity in 2024 heated and expanded the upper atmosphere, raising drag and accelerating Swift's descent. NASA launched the Swift Boost mission in early July 2026, a $30 million effort to dock with the observatory and raise its orbit. Katalyst Space's robotic LINK spacecraft ran into attitude control problems and could not keep its orientation, and NASA decided to end the mission a couple of weeks later. NASA administrator Jared Isaacman explained in August that the control-system problems led to the mission's cancellation. Swift made its final observation on 20 October, and on 26 October NASA said it was less than 170 miles from Earth's surface.

Scientific record

Swift launched on 20 November 2004 with three telescopes, designed mainly to detect gamma-ray bursts and send their positions to observatories around the world. Its primary mission was planned for two years, but before operations ended it observed more than 2,000 gamma-ray bursts and gathered data on 1,400 supernova explosions, asteroids and comets. Shawn Domagal-Goldman, director of the Astrophysics Division at NASA headquarters, put the return this way:

“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.”

The re-entry will end a telescope that outlived its design life by more than a decade, with its final position still unknown until shortly before it falls.