The Long March 5B - comprising one core stage and four boosters - lifted off from China's Hainan island on April 29.
Remnants of China's largest rocket launched last week are expected to plunge back through the atmosphere late Saturday or early Sunday, the U.S. federally funded space-focused research and development centre said.
China's foreign ministry said on Friday that most debris from the rocket will be burned up on re-entry and is highly unlikely to cause any harm after the U.S. military said that what it called an uncontrolled re-entry was being tracked by U.S. Space Command.
In a tweet sent on Friday evening in the United States, the Aerospace Corporation said that the latest prediction for the re-entry of the Long March 5B rocket body by its Center for Orbital Reentry and Debris Studies (CORDS) was for eight hours on either side of 0419 GMT on Sunday.
CORDS' latest "informed prediction" of the rocket body's re-entry location was given near the North Island of New Zealand, but it noted that re-entry was possible anywhere along paths covering large swathes of the globe.
The Long March 5B - comprising one core stage and four boosters - lifted off from China's Hainan island on April 29 with the unmanned Tianhe module, which contains what will become living quarters on a permanent Chinese space station.
The Long March launched last week was the second deployment of the 5B variant since its maiden flight in May last year. Harvard-based astrophysicist Jonathan McDowell previously told Reuters there is a chance that pieces of the rocket could come down over land, perhaps in a populated area, as in May 2020, when pieces from the first Long March 5B rained down on the Ivory Coast, damaging several buildings, though no injuries were reported.
"The Long March 5B re-entry is unusual because, during the launch, the first stage of the rocket reached orbital velocity instead of falling downrange as is common practice," the Aerospace Corporation said in a blog post.
"The empty rocket body is now in an elliptical orbit around Earth where it is being dragged toward an uncontrolled re-entry." The empty core stage has been losing altitude since last week, but the speed of its orbital decay remains uncertain due to unpredictable atmospheric variables. It is one of the largest space debris to re-enter Earth, at 18 tonnes.
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