China says debris of Long March 5B landed in Indian Ocean and that most of it was burned up in the atmosphere.
Remnants of China’s largest rocket, launched last month, has plunged back through the atmosphere, landing west of the Maldives in the Indian Ocean.
“After monitoring and analysis, at 10:24 (02:24 GMT) on May 9, 2021, the last-stage wreckage of the Long March 5B Yao-2 launch vehicle has reentered the atmosphere,” the China Manned Space Engineering Office said in a statement on Sunday morning.
It added that most of the components burned up in the re-entry.
Monitoring service Space-Track, which uses US military data, also confirmed the re-entry.
“Everyone else following the #LongMarch5B re-entry can relax. The rocket is down,” it tweeted.
“We believe the rocket went down in the Indian Ocean, but are waiting on official data from @18SPCS,” it added in a separate tweet, referring to a squadron of the US Space Force.
US and European authorities had been monitoring the rocket, which was travelling at a speed of approximately 13.7km/second (4.8 miles/second).
A difference of just one minute in the time of re-entry translates to hundreds of kilometres difference on the ground and earlier predictions had the rocket landing in several possible locations from the Mediterranean Sea to the Pacific Ocean.
According to experts, with most of the Earth’s surface covered by water, the odds that it would land in a populated area were low, and the likelihood of injuries even lower.
But uncertainty over the rocket’s orbital decay and China’s failure to issue stronger reassurances in the run-up to the re-entry fuelled anxiety over its descent.
China’s foreign ministry said on Friday that the re-entry was highly unlikely to cause any harm.
NASA criticism
The Long March 5B – comprising one core stage and four boosters – lifted off on April 29 from China’s Hainan Island with the unmanned Tianhe module, which contains what will become living quarters on a permanent Chinese space station.
The rocket is set to be followed by 10 more missions to complete the station.
Most experts said the risk to people from the re-entry was low.
“Given the size of the object, there will necessarily be big pieces left over,” said Florent Delefie, an astronomer at the Paris-PSL Observatory.
“The chances of debris landing on an inhabited zone are tiny, probably one in a million.”
In May 2020, pieces from the first Long March 5B fell on Ivory Coast, damaging several buildings. No injuries were reported.
“Spacefaring nations must minimize the risks to people and property on Earth of re-entries of space objects and maximize transparency regarding those operations,” NASA Administrator Bill Nelson, a former senator and astronaut who was picked for the role in March, said in a statement after the re-entry.
“It is clear that China is failing to meet responsible standards regarding their space debris.”
Debris from Chinese rocket launches is not uncommon within China. In late April, authorities in the city of Shiyan, Hubei Province, issued a notice to people in the surrounding county to prepare for evacuation as parts were expected to land in the area.
The latest remnants of Long March 5B make up one of the largest pieces of space debris to return to Earth.
The core stage of the first Long March 5B that returned to Earth last year weighed nearly 20 tonnes, surpassed only by debris from the Columbia space shuttle in 2003, the Soviet Union’s Salyut 7 space station in 1991, and NASA’s Skylab in 1979.
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