Saturday, May 08, 2021

China says most rocket debris burned up during reentry

BEIJING — China's space agency said a core segment of its biggest rocket reentered Earth’s atmosphere above the Maldives in the Indian Ocean and most of it burned up early Sunday
© Provided by The Canadian Press

Harvard astrophysicist Jonathan McDowell, who tracked the tumbling rocket part, said on Twitter, “An ocean reentry was always statistically the most likely. It appears China won its gamble… But it was still reckless.”

China’s official Xinhua News Agency said reentry occurred at 7:24 p.m. local time Saturday. “The vast majority of items were burned beyond recognition during the reentry process," the report said.

Despite that, NASA Administrator Sen. Bill Nelson issued a statement saying: "It is clear that China is failing to meet responsible standards regarding their space debris.”

Usually, discarded rocket stages reenter the atmosphere soon after liftoff, normally over water, and don’t go into orbit.


The Long March 5B rocket carried the main module of Tianhe, or Heavenly Harmony, into orbit on April 29. China plans 10 more launches to carry additional parts of the space station into orbit.

The roughly 30-meter (100-foot) -long stage would be among the biggest space debris to fall to Earth.

The 18-ton rocket that fell last May was the heaviest debris to fall uncontrolled since the former Soviet space station Salyut 7 in 1991.

China’s first space station, Tiangong-1, crashed into the Pacific Ocean in 2016 after Beijing confirmed it had lost control. In 2019, the space agency controlled the demolition of its second station, Tiangong-2, in the atmosphere.

In March, debris from a Falcon 9 rocket launched by U.S. aeronautics company SpaceX fell to Earth in Washington and on the Oregon coast.

China was heavily criticized after sending a missile to destroyed a defunct weather satellite in January 2007, creating a large field of hazardous debris imperiling satellites and other spacecraft.

The Associated Press

Chinese rocket debris lands in Indian Ocean, draws criticism from NASA

By Ryan Woo 2 hrs ago
© Reuters/TINGSHU WANG FILE PHOTO: The Long March-5 Y5 rocket, carrying the Chang'e-5 lunar probe, is seen before taking off from Wenchang Space Launch Center, in Wenchang

BEIJING (Reuters) -Remnants of China's biggest rocket landed in the Indian Ocean on Sunday, with most of its components destroyed upon re-entry into the atmosphere, ending days of speculation over where the debris would hit but drawing U.S. criticism over lack of transparency.

The coordinates given by Chinese state media, citing the China Manned Space Engineering Office, put the point of impact in the ocean, west of the Maldives archipelago.

Debris from the Long March 5B has had some people looking warily skyward since it blasted off from China's Hainan island on April 29, but the China Manned Space Engineering Office said most of the debris was burnt up in the atmosphere.

State media reported parts of the rocket re-entered the atmosphere at 10:24 a.m. Beijing time (0224 GMT) and landed at a location with the coordinates of longitude 72.47 degrees east and latitude 2.65 degrees north.

The U.S. Space command confirmed the re-entry of the rocket over the Arabian Peninsula, but said it was unknown if the debris impacted land or water.

"The exact location of the impact and the span of debris, both of which are unknown at this time, will not be released by U.S. Space Command," it said in a statement on its website.

The Long March was the second deployment of the 5B variant since its maiden flight in May 2020. Last year, 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.


Video: China says remnants of Long March 5B about to re-enter earth's atmosphere (Reuters)

"It is clear that China is failing to meet responsible standards regarding their space debris."

ANXIETY OVER POTENTIAL DEBRIS ZONE

With most of the Earth's surface covered by water, the odds of populated area on land being hit had been low, and the likelihood of injuries even lower, according to experts.

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.

"It is critical that China and all spacefaring nations and commercial entities act responsibly and transparently in space to ensure the safety, stability, security, and long-term sustainability of outer space activities," Nelson said.

Harvard-based astrophysicist Jonathan McDowell told Reuters that the potential debris zone could have been as far north as New York, Madrid or Beijing, and as far south as southern Chile and Wellington, New Zealand.

Since large chunks of the NASA space station Skylab fell from orbit in July 1979 and landed in Australia, most countries have sought to avoid such uncontrolled re-entries through their spacecraft design, McDowell said.

"It makes the Chinese rocket designers look lazy that they didn't address this," said McDowell.

The Global Times, a Chinese tabloid, dismissed as "Western hype" concerns the rocket was "out of control" and could cause damage.

"It is common practice across the world for upper stages of rockets to burn up while reentering the atmosphere," Wang Wenbin, a spokesman at China's foreign ministry, said at a regular media briefing on May 7.

"To my knowledge, the upper stage of this rocket has been deactivated, which means most of its parts will burn up upon re-entry, making the likelihood of damage to aviation or ground facilities and activities extremely low," Wang said at the time.

The rocket, which put into orbit an unmanned Tianhe module containing what will become living quarters for three crew on a permanent Chinese space station, will be followed by 10 more missions to complete the station by 2022.

(Reporting by Ryan Woo, Hallie Gu and Xiao Han in Beijing and Peter Szekely in New York; Editing by Himani Sarkar & Simon Cameron-Moore)

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