China’s space station unlikely to crash into M’sia — Angkasa
PETALING JAYA: The probability of China's first space station, Tiangong-1, falling to Malaysia is very low, said the Ministry of Science, Technology and Innovation (Mosti) via the National Space Agency (Angkasa).
In a statement yesterday (Nov 16), Angkasa director-general Dr Noordin Ahmad said that based on calculations, the width of the area between latitudes of 43 degrees North to 43 degrees South involves many other countries.
Including Malaysia, it spans an estimated area of 347,860,000 square km.
“Apart from Malaysia, specifically Kuala Lumpur, this area encompasses Singapore (1.35 degrees North), Sydney, Australia (33.86 degrees South), Florida, America (27.66 degrees North) and Beijing, China (39.90 degrees North),” he said.
Taking into account the size of the Federal Territory, which is 243.65 square km, the likelihood of Kuala Lumpur being the crash site of debris is very small, with an approximate 0.0000699% chance only.
“The likelihood for Malaysia is only 0.09%, after taking into account the overall area of 329,960.22 square km,” said Dr Noordin, citing data from data. gov.my and the Information Department.
According to China's note to the United Nations, most of the structural components from Tiangong-1 will be burnt and destroyed due to friction with Earth's atmosphere (during reentry).
The probability for debris to cause damage to activities on Earth, including flights, is very low.
The note, dated May 4, 2017 with the reference number AC. 105/1150 can be viewed at the United Nation of Outer Space Affair (UNOOSA) website.
Through this note, China also informed that monitoring and forecast activities will be increased and predictions of reentry time will be aired.
Further information will be obtained from the Inter-Agency Space Debris Coordination Committee dan orbital status, as well as any relevant information, will be published on http://www. cmse.gov.cn/.
The final prediction with regards to the time and place of Tiangong-1's crash will be provided by China for the attention of UNOOSA and the UN secretary-general.
Many space agencies such as ESA, NASA, JAXA and CNSA are keenly observing and monitoring the dwindling of the space station.
Angkasa, which shares a close relationship with these agencies, is also watching developments closely.
During the expected crash period, Angkasa will monitor Tiangong-1's altitude daily and further inform the public as necessary.
The 8.5-tonne Chinese space station has accelerated its out-ofcontrol descent towards Earth and is expected to crash to the surface within a few months.
The Tiangong-1 or “Heavenly Palace” lab was launched in 2011 and described as a “potent political symbol” of China, part of an ambitious scientific push to turn China into a space superpower.
It was used for both manned and unmanned missions and visited by China's first female astronaut, Liu Yang, in 2012.
But in 2016, after months of speculation, Chinese officials confirmed they had lost control of the space station and it would crash to Earth in 2017 or 2018. China's space agency has since notified the UN that it expects Tiangong-1 to come down between October 2017 and April 2018.
Since then the station's orbit has been steadily decaying. In recent weeks it has dipped into more dense reaches of Earth's atmosphere and started falling faster.
“Now that [its] perigee is below 300km and it is in denser atmosphere, the rate of decay is getting higher,” said Jonathan McDowell, a renowned astrophysicist from Harvard University and a space industry enthusiast.
“I expect it will come down a few months from now – late 2017 or early 2018.”
Although much of the craft is expected to burn up in the atmosphere, McDowell says some parts might still weigh up to 100kg when they crash into the Earth's surface.
The chance that anyone will be harmed by the debris is considered remote but China told the United Nations “Committee on the Peaceful Uses of Outer Space” in May that it would carefully monitor the craft's descent and inform the United Nations when it begins its final plunge.
Predicting where it is going to come down would be impossible even in the days ahead of its landing, McDowell said.
“You really can't steer these things,” he said in 2016. “Even a couple of days before it re-enters we probably won't know better than six or seven hours, plus or minus, when it's going to come down. Not knowing when it's going to come down translates as not knowing where it's going to come down.”
McDowell said a slight change in atmospheric conditions could nudge the landing site “from one continent to the next”.
There have been many uncontrolled re-entries of larger spacecraft and none have ever been reported to have caused injuries to people.
In 1991 the Soviet Union's 20tonne Salyut 7 space station crashed to Earth while still docked to another 20-tonne spacecraft called Cosmos 1686. They broke up over Argentina, scattering debris over the town of Capitán Bermúdez.
Nasa's enormous 77-tonne Skylab space station came hurtling to Earth in an almost completely uncontrolled descent in 1979, with some large pieces landing outside Perth in Western Australia.