After almost 22 years of chasing the universe’s most powerful explosions, NASA’s Neil Gehrels Swift Observatory is coming home. NASA says the spacecraft is expected to re-enter Earth’s atmosphere on Wednesday, November 4.
This summary relies on the agency’s own update, published on the NASA Swift blog on Monday, plus other NASA updates from the same day.
When and where
As of Monday, the U.S. Space Force predicted that the roughly 3,200-pound spacecraft will re-enter at about 3:30 a.m. EST on November 4. The uncertainty on that prediction is 11 hours, so the actual time could fall well before or after that estimate. NASA and the Space Force will keep monitoring the spacecraft and update the forecast.
NASA expects most of the spacecraft to burn up as it travels through the atmosphere, but some components are expected to survive re-entry. Because Swift orbits at a low inclination, any surviving fragments would land between 20.6 degrees south latitude and 20.6 degrees north latitude. The exact location depends on when the re-entry happens.
How risky is it?
NASA says the risk of harm to anyone on Earth is unlikely, at approximately 1 in 2,100. If you want to follow the latest prediction, NASA says it will post updates on the Swift blog.
A mission that outlived its plan
Swift launched in 2004 as a first-of-its-kind multiwavelength observatory with three telescopes. It was designed to study gamma-ray bursts, the most powerful explosions in the cosmos. Its prime mission was originally planned to last just two years, and it ended up working for more than two decades.
NASA describes the observatory as a multi-tool. It could point quickly at short-lived outbursts and send alerts to other facilities so they could coordinate follow-up observations. That ability helped Swift broaden our understanding of everything from active galaxies powered by supermassive black holes to stars undergoing X-ray flares, supernova explosions, and even comets and asteroids in our own solar system.
Other NASA news this week
Swift is not the only space story making headlines this week. NASA’s updates from Monday include:
- ESCAPADE flybys: NASA’s twin ESCAPADE spacecraft will each perform a powered flyby of Earth on the way to Mars, combining Earth’s gravity with an engine burn. The first is around 5 a.m. EST on Saturday, November 7, and the second is two days later, around 6 a.m. EST on Monday, November 9. The spacecraft are due to reach Mars in September 2027, according to NASA.
- A final space station spacewalk: Astronauts Joshua Kutryk of the Canadian Space Agency and Anil Menon of NASA plan to install the eighth and final roll-out solar array on Thursday, November 5, with the spacewalk planned to start at 8:10 a.m. EST. NASA says this should raise the station’s power capacity by about 30%, to roughly 215 kilowatts.
- A Hubble mystery: In a NASA update on Monday, researchers using Hubble reported a case of missing oxygen in nearby dwarf galaxies, which retain only a small fraction of the oxygen their stars produced.
Why this matters
Spacecraft re-entries are a normal part of the life cycle for satellites in low-Earth orbit. Swift’s end is notable because it is a scientific workhorse that far exceeded its design life. NASA expects most of it to burn up, and the agency’s tracking will give a clearer picture as the day approaches.
Wrap-up
Swift leaves behind two decades of observations and a legacy of rapid-response astronomy. If you follow the story on Wednesday, rely on NASA and the Space Force for updates, and treat any unofficial claims about debris or locations with caution.
Image: Swift Observatory rendering front composite (SVS13926) by NASA/Goddard Space Flight Center/Chris Smith (KBRwyle) via Wikimedia Commons, Public Domain Mark 1.0
